Negative resist formulation for producing undercut pattern profiles

文档序号：1722200 发布日期：2019-12-17 浏览：20次中文

阅读说明：本技术 用于生产底切图案轮廓的负性抗蚀剂配制剂 (Negative resist formulation for producing undercut pattern profiles ) 是由 A·穆克赫尔吉 M·A·托克西于 2018-04-23 设计创作，主要内容包括：本发明公开可用365nm辐射成像、可在水性碱中显影的负性工作的光致抗蚀剂组合物。除溶剂外,这种组合物还包含：a)具有环键合羟基的水性碱溶性酚类成膜聚合物粘结剂树脂；b)光致产酸剂；c)包含醚化三聚氰胺的交联剂；d)如本文所述的染料；e)基本上由如所述的胺猝灭剂或此类胺猝灭剂的混合物组成的猝灭剂体系。本发明还涉及使用这种组合物作为光致抗蚀剂的方法。(Negative-working photoresist compositions that can be imaged with 365nm radiation and developed in aqueous base are disclosed. In addition to the solvent, such compositions comprise: a) an aqueous alkali soluble phenolic film forming polymer binder resin having a ring-bonded hydroxyl group; b) a photoacid generator; c) a crosslinker comprising an etherified melamine; d) a dye as described herein; e) a quencher system consisting essentially of an amine quencher or a mixture of such amine quenchers as described. The invention also relates to a method of using such a composition as a photoresist.)

1. A chemically amplified negative-working photoresist composition imageable with 365nm radiation and developable in aqueous base, comprising solid components a), b), c), d) and e) and solvent component f);

a) An aqueous alkali soluble phenolic film forming polymer binder resin having a ring-bonded hydroxyl group;

b) A photoacid generator that forms an amount of acid sufficient to initiate crosslinking of the film-forming binder resin upon exposure to 365nm radiation;

c) Carbon formation upon exposure to the acid from step b) generated by exposure to radiationA crosslinker that is ionic and comprises an etherified melamine;

d) Having about 1.74X10 as measured in PGMEA⁴To about 0.94X10⁴Mole of^-1L cm^-1A dye having a molar attenuation coefficient at 365 nm;

e) A quencher system consisting essentially of an amine quencher or mixture of such amine quenchers having a pKa in water of from about 6.0 to about 12, wherein the amine quencher has a boiling point of at least 100 ℃ at 1 atmosphere and comprises at least one C2-C25 alkyl substituent, - (CH)₂)_nOH substituent or- (CH)₂)_n-O-(CH₂)_n’-O-R ' substituents or mixtures comprising these substituents, wherein n and n ' are independently an integer from 2 to 4 and R ' is C1-C4 alkyl or H;

f) A photoresist solvent.

2. The photoresist composition of claim 1, wherein the solid component e) is as follows: wherein further said amine quenchers or mixtures of such amine quenchers are those having structure (1), wherein R is₁And R_1aMay be independently selected from H, C1 to C5 alkyl or aryl, wherein further, R₁and R_1aat least one of which is a C10 to C25 alkyl substituent or- (CH)₂)_nOH substituent group, whichWherein n is an integer from 2 to 4, and further wherein positions 3 and 2 are connected by a single or double bond;

3. The photoresist composition of claim 1 or 2, wherein the solid component d), i.e., the dye, is soluble in an aqueous base; and further wherein the solid component e) is as follows: wherein further said amine quenchers or mixtures of such amine quenchers are those having structure (1), wherein R is₁And R_1amay be independently selected from H, C1 to C5 alkyl or aryl, wherein further, R₁And R_1aat least one of which is a C10 to C25 alkyl substituent or- (CH)₂)_nAn OH substituent, wherein n is an integer from 2 to 4, and further wherein positions 3 and 2 are connected by a single or double bond;

4. A photoresist composition according to one of claims 1 to 3, wherein the solid component b), i.e. the photoacid generator, is a trihalomethyl derivative (halo ═ Cl or Br) -based photoacid generator which forms an acid upon exposure to 365nm radiation in an amount sufficient to initiate crosslinking of the film-forming binder resin, wherein the halo moiety is chlorine or bromine; and further wherein the solid component e) is as follows: wherein further said amine quenchers or mixtures of such amine quenchers are those having structure (1), wherein R is₁And R_1aMay be independently selected from H, C1 to C5 alkyl or aryl, wherein further, R₁And R_1aAt least one of which is a C10 to C25 alkyl substituent or- (CH)₂)_nAn OH substituent, wherein n is an integer from 2 to 4, and further wherein positions 3 and 2 are connected by a single or double bond;

5. The photoresist composition according to one of claims 1 to 4, wherein the solid component d), i.e. the dye, is soluble in an aqueous base; wherein further the solid component b), i.e. the photoacid generator, is a trihalomethyl derivative (halo ═ Cl or Br) -based photoacid generator which forms an acid upon exposure to 365nm radiation in an amount sufficient to initiate crosslinking of the film-forming binder resin, wherein the halo moiety is chlorine or bromine; and further wherein the solid component e) is as follows: wherein further said amine quenchers or mixtures of such amine quenchers are those having structure (1), wherein R is₁and R_1aMay be independently selected from H, C1 to C5 alkyl or aryl, wherein further, R₁And R_1aAt least one of which is a C10 to C25 alkyl substituent or- (CH)₂)_nAn OH substituent, wherein n is an integer from 2 to 4, and further wherein positions 3 and 2 are connected by a single or double bond;

6. The photoresist composition of one of claims 1 to 5, where the solid component e), the quencher system, consists solely of a compound or mixture of compounds having the structure (17), wherein n and n 'are independently integers from 2 to 4 and R' is C1-C4 alkyl or H;

7. The photoresist composition of one of claims 1 to 6, where the solid component e), the quencher system, consists solely of a compound or mixture of compounds having the structure (21), wherein R₉And R₁₀Independently selected from H or C2-C25 alkyl, and further wherein R₉Or R₁₀At least one of which is a C2-C25 alkyl group;

8. The photoresist composition of claim 6 or 7, wherein the solid component b), i.e. the photoacid generator, is a trihalomethyl derivative (halo ═ Cl or Br) -based photoacid generator which forms an acid upon exposure to 365nm radiation in an amount sufficient to initiate crosslinking of the film-forming binder resin, wherein the halo moiety is chlorine or bromine; and further wherein the solid component e) is as follows: wherein further said amine quenchers or mixtures of such amine quenchers are those having structure (1), wherein R is₁And R_1aMay be independently selected from H, C1 to C5 alkyl or aryl, wherein further, R₁And R_1aAt least one of which is a C10 to C25 alkyl substituent or- (CH)₂)_nan OH substituent, wherein n is an integer from 2 to 4, and further wherein positions 3 and 2 are connected by a single or double bond.

9. The photoresist composition of claim 6 or 7, wherein the solid component d), i.e. the dye, is soluble in an aqueous base.

10. The photoresist composition according to any one of claims 1 to 9, wherein the solid component a), i.e. the binder resin, is an alkali soluble novolak resin.

11. The photoresist composition of any one of claims 1 to 9, wherein the solid component a), i.e., the binder resin, comprises a repeating unit of structure (2), wherein q is the number of repeating units in the polymer chain,

12. a photoresist composition of any one of claims 1,2, 3 or 6 to 7, wherein the solid component b), i.e. the photoacid generator, is selected from the group consisting of substituted or unsubstituted triarylsulfonium salts of organic sulfonic acids, substituted or unsubstituted 1, 3-dioxo-1H-benzo [ de ] isoquinolin-2 (3H) -yl esters of organic sulfonic acids containing at least one aryl moiety with a conjugated aryl group in the triarylsulfonium moiety or in its acid anion, wherein said conjugated aryl moiety is selected from the group consisting of phenyl rings with at least one substituent selected from the group consisting of aryloxy, alkoxy, nitro, aryl, alkenyl, or wherein alternatively said conjugated aryl moiety is a substituted or unsubstituted fused aromatic ring moiety containing 2 to 4 rings.

13. the photoresist composition of any one of claims 4 to 11, where the solid component b), the photoacid generator, is an aromatic hydrocarbon or trihalomethyl derivative of a substituted aromatic hydrocarbon containing 1 to 3 trihalomethyl substituents.

14. The photoresist composition of any one of claims 4 to 11, where the solid component b), the photoacid generator, is a compound containing 1 to 3 sulfone spacer (-SO)₂-) to a trihalomethyl substituent on the arene or substituted arene moiety.

15. The photoresist composition of any one of claims 4 to 11, where the solid component b), the photoacid generator, is a trihalomethyl derivative of a heteroarene or substituted heteroarene containing 1 to 3 trihalomethyl moieties.

16. The photoresist composition of any one of claims 4 to 11, where the solid component b), the photoacid generator, is a compound containing 1 to 3 sulfone spacer (-SO)₂-) Trihalomethyl attached to the heteroarene or substituted heteroareneSubstituted heteroarenes or trihalomethyl derivatives of substituted heteroarenes.

17. The photoresist composition of any one of claims 4 to 11, where solid component b), the photoacid generator, is a trihalomethyl derivative having the structure (3) where R is₂Is a substituted or unsubstituted alkenyl group or a substituted or unsubstituted aryl group or a substituted or unsubstituted fused aromatic ring moiety containing 2 to 4 rings therein,

And Y is oxygen or nitrogen and X is Cl or Br;

18. The photoresist composition of any one of claims 4 to 11, where the solid component b), the photoacid generator, isAzoles or substituted with structure (4)Trihalomethyl derivatives of oxazinones (oxazone), wherein R is₃Is a substituted or unsubstituted alkenyl or a substituted or unsubstituted aryl, and X is Cl or Br;

19. A photoresist composition of any one of claims 4 through 11 wherein solid component b), the photoacid generator, is a trihalomethyl derivative of a substituted triazine containing 1 or 2 trihalomethyl moieties.

20. The photoresist composition of any one of claims 4 to 11, where the solid component b), the photoacid generator, is a trihalo having the structure (5)Methyl derivatives in which X is Br or Cl and R₄is an unsubstituted or substituted alkenyl, unsubstituted aryl or substituted aryl moiety or a substituted or unsubstituted fused aromatic ring moiety containing 2 to 4 rings;

21. The photoresist composition of any one of claims 4 to 11, where the solid component b), the photoacid generator, is a trihalomethyl derivative having the structure (6), and R_4aIs an unsubstituted or substituted alkenyl group or an unsubstituted aryl or substituted aryl moiety,

22. The photoresist composition of any one of claims 4 to 11, where solid component b), the photoacid generator, is a trihalomethyl derivative having the structure (7) wherein o is 1 or 2, X is Cl or Br, and further wherein R is₅Is a C4 or C5 cyclic aliphatic ether moiety containing one or two olefin linkages substituted with hydrogen or C1 to C2 alkyl,

23. The photoresist composition of any one of claims 4 to 11, where solid component b), the photoacid generator, is a trihalomethyl derivative having the structure (8) where o is 1 or 2, X is Cl or Br, and R is₆Is hydrogen or C1 to C3 alkyl,

24. the photoresist composition of claim 22 or 23, wherein X is Cl.

25. The photoresist composition of claim 22 or 23, wherein X is Br.

26. The photoresist composition of any one of claims 4 to 11, where solid component b), the photoacid generator, is a trihalomethyl group having structure (9), where X is Cl or Br, and further where R is₆Is hydrogen or C1 to C3 alkyl,

27. The photoresist composition of claim 26, wherein X is chlorine.

28. The photoresist composition of claim 26, wherein X is bromine.

29. The photoresist composition of any one of claims 23 through 26, where R₆Is hydrogen.

30. The photoresist composition of any one of claims 23 through 26, where R₆Is methyl.

31. The photoresist composition of any one of claims 23 through 26, where R₆Is ethyl.

32. The photoresist composition of any one of claims 23 to 26, where the solid component b), the photoacid generator, has the structure (10),

33. the photoresist composition of any one of claims 1 to 32, where solid component c), the crosslinking agent, comprises an etherified melamine selected from those having structure (11), oligomers formed from (11), or mixtures of these; wherein R is₇Is C1 to C4 alkyl, H or a moiety representing structure (11a), whereinRepresents the point of attachment of the structural moiety (11a) to the structure (11), wherein R_7aIs C1 to C4 alkyl, H, or a moiety representing another structure (11a),

34. The photoresist composition of any one of claims 1 to 33, where solid component c), the crosslinking agent, comprises an etherified melamine selected from those having structure (12), oligomers formed from (12), or mixtures of these; wherein R is₈Is methyl, H or a moiety representing structure (12a), whereinRepresents the point of attachment of the structural moiety (12a) to the structure (12), wherein R_8aIs methyl, H or a moiety representing another structure (12a),

35. The photoresist composition of any one of claims 1 to 34, where the solid component d), i.e. the dye, is an aqueous alkali soluble dye having the structure (13) wherein m1 and m2 are independently 1 to 3,

36. The photoresist composition of any one of claims 1 to 35, where the solid component d), i.e. the dye, is an aqueous alkali-soluble dye having the structure (14),

37. the photoresist composition of any one of claims 2 to 36, where the solid component e) having the structure (1), i.e., the quencher, is as follows, where R is₁Is a C15 to C20 alkyl moiety, and R_1aIs- (CH)₂)_nOH, wherein n is an integer from 2 to 4, and further wherein positions 3 and 2 are connected by a single bond.

38. The photoresist composition of any one of claims 2 to 37, where solid component e), the quencher system, is that of a compound having one structure (1) wherein R is_1aIs- (CH)₂)_nOH, and wherein n is 2 or 3, and further wherein positions 3 and 2 are connected by a single bond.

39. The photoresist composition of any one of claims 2 to 38, where the solid component e), i.e. the quencher system, is that of a compound having one structure (1) wherein R is_1aIs- (CH)₂)_nOH, and wherein n is 2, and further wherein positions 3 and 2 are connected by a single bond.

40. the photoresist composition of any one of claims 1 and 10 to 39, where the solid component e), the quencher system, consists solely of the compound of structure (15),

41. The photoresist composition of any one of claims 2 to 4 and 10 to 36, where the solid component e), i.e. the quencher system, is that of a compound having one structure (1) wherein R1 is a C15 to C20 alkyl moiety and R is_1aIs C1 to C5 alkyl, and further wherein positions 3 and 2 are connected by a single bond.

42. The photoresist composition of any one of claims 2 to 4 and 10 to 36, where the solid component e), i.e. the quencher system, is that of a compound having one structure (1) wherein R1 is a C15 to C20 alkyl moiety and R is_1aIs C3 to C5 alkyl, and further wherein positions 3 and 2 are connected by a single bond.

43. The photoresist composition of any one of claims 2 to 4 and 10 to 36, where the solid component e), i.e. the quencher system, is that of a compound having one structure (1) wherein R1 is a C15 to C20 alkyl moiety and R is_1aIs C4 to C5 alkyl, and further wherein positions 3 and 2 are connected by a single bond.

44. The photoresist composition of any one of claims 2 to 4 and 10 to 36, where the solid component e) having structure (1), i.e. the quencher, is as follows: wherein R is₁Is a C1 to C5 alkyl moiety or H and R_1aIs- (CH)₂)_nOH, wherein n is an integer from 2 to 4, and further wherein positions 3 and 2 are connected by a double bond.

45. the photoresist composition of any one of claims 2 to 4 and 10 to 36, where the solid component e) having structure (1), i.e. the quencher, is as follows: wherein R is₁Is a C1 to C3 alkyl moiety or H and R_1aIs- (CH)₂)_nOH, wherein n is an integer from 2 to 4, and further wherein positions 3 and 2 are connected by a double bond.

46. The photoresist composition of any one of claims 2 to 4 and 10 to 36, where the solid component e) having structure (1), i.e. the quencher, is as follows: wherein R is₁Is H and R_1aIs- (CH)₂)_nOH, wherein n is an integer from 2 to 4, and further wherein positions 3 and 2 are connected by a double bond.

47. The photoresist composition of any one of claims 2 to 4 and 10 to 36, wherein the solid component e), i.e. the quencher system, consists of a compound of structure (16),

48. the photoresist composition of any one of claims 2 to 4 and 10 to 36, where the solid component e), i.e. the quencher system, is that of a compound having one structure (1) where R is₁Is a C15 to C20 alkyl moiety, and R_1ais C1 to C5 alkyl, and further wherein positions 3 and 2 are connected by a double bond.

49. the photoresist composition of any one of claims 2 to 4 and 10 to 36, where the solid component e), i.e. the quencher system, is that of a compound having one structure (1) where R is₁Is a C15 to C20 alkyl moiety, and R_1aIs C3 to C5 alkyl, and further wherein positions 3 and 2 are connected by a double bond.

50. The photoresist composition of any one of claims 2 to 4 and 10 to 36, where the solid component e), i.e. the quencher system, is that of a compound having one structure (1) where R is₁Is a C15 to C20 alkyl moiety, and R_1aIs C4 toC5 alkyl, and further wherein positions 3 and 2 are connected by a double bond.

51. The photoresist composition of any one of claims 1 to 50, wherein the composition of the photoresist composition is about 30 to about 45 weight percent total solids in the solvent.

52. the photoresist composition of any one of claims 1 to 51, wherein the composition of the total solid components a), b), c), d) and wherein the solid component a) is from about 60 to about 90 weight percent; solid component b) from about 0.5 to about 8.0 wt%; solid component c) from about 8.0 to about 30 wt%; component d) is from about 0.4 to about 8.0 wt%; and solid component e) is from about 0.5 to about 4.0 wt%, wherein the sum of the total wt% of all solid components a), b), c), d) and e) does not exceed 100 wt%.

53. A method of imaging a photoresist composition comprising:

a1) Applying a photoresist composition from any one of claims 1 to 52 to a surface of a suitable substrate to form a photoresist coating;

b1) Heat treating the photoresist coated substrate from step b) until substantially all of the photoresist solvent is removed from the photoresist composition, thereby forming a photoresist film;

c1) Imagewise exposing the photoresist film from step c) to imagewise i-radiation to form an irradiated photoresist film containing exposed and unexposed regions;

d1) Baking the irradiated resist film after the exposing step c);

e1) Removing the unexposed areas of the irradiated photoresist film from step d1) with a developer to form a substrate covered with an undercut photoresist pattern that undercuts at the resist substrate interface to form a photoresist overhang.

54. A lift-off process for metallization of a patterned photoresist on a substrate, comprising:

a2) Depositing a metal layer on the substrate covered by the undercut photoresist pattern from step e1) of claim 53 using metal deposition by EBPVD, CVD deposition or sputtering, wherein metal deposition on the substrate covered by the undercut photoresist pattern deposits metal only in the uncovered substrate in the patterned photoresist not protected by the photoresist overhang at the substrate interface, but further wherein metal deposition occurs elsewhere on the substrate not covered by the remaining photoresist, thereby forming a substrate with both selective metal deposition and undercut photoresist pattern with a metal coating only on top of the photoresist pattern (surface metallization resist pattern);

b2) Stripping the metallized photoresist pattern after step a2), resulting in a substrate wherein metallization occurs only in the uncovered substrate in the patterned photoresist that is not protected by the overhang of the undercut patterned photoresist.

55. The lift-off method of claim 54 wherein the stripping in step b2) is performed with a chemical stripper.

56. The lift-off method of claim 55 wherein the peeling is performed in step b2) with adhesive tape.

57. The lift-off method of claim 55 wherein any residual resist is removed after step b2) with a chemical stripper.

58. A chemically amplified negative-working photoresist composition imageable with 365nm radiation and developable in aqueous base, comprising solid components a), b), c), d) and e) and solvent component f);

a) an aqueous alkali soluble phenolic film forming polymer binder resin having a ring-bonded hydroxyl group; the binder resin comprises a repeating unit having a structure (2) wherein q is the number of repeating units in the polymer chain,

b) A photoacid generator that forms an amount of acid sufficient to initiate crosslinking of the film-forming binder resin upon exposure to 365nm radiation, wherein the photoacid generator has the structure (10),

c) carbon formation upon exposure to the acid from step b) generated by exposure to radiationa crosslinker that is ionic and comprises an etherified melamine, wherein the crosslinker comprises an etherified melamine selected from those having structure (12), oligomers formed from (12), or mixtures of these; wherein R is₈Is methyl, H or a moiety representing structure (12a), whereinRepresents the point of attachment of the structural moiety (12a) to the structure (12), wherein R_8aIs methyl, H or a moiety representing another structure (12a),

d) Dye having structure (14)

e) A quencher system consisting essentially of an amine quencher having the structure (15)

f)PGMEA。

Technical Field

background

Photoresist compositions are used in microlithography for making miniaturized electronic components, such as for making computer chips and integrated circuits. Generally, in these processes, a thin film of a photoresist composition is first applied to a substrate material, such as silicon wafers used in the manufacture of integrated circuits. The coated substrate is then baked to evaporate the solvent in the photoresist composition and to fix the coating onto the substrate. The baked coated surface of the substrate is then imagewise exposed to imaging radiation.

This radiation exposure causes a chemical transformation in the exposed areas of the coated surface. Visible light, Ultraviolet (UV) light, electron beam and X-ray radiation energy are imaging radiation types commonly used today in microlithography. After such image-wise exposure, the coated substrate is treated with a developer solution to dissolve and remove either the radiation-exposed or the unexposed areas of the coated surface of the substrate.

There are two types of photoresist compositions, negative-working and positive-working. When negative-working photoresist compositions are image-wise exposed to radiation, the areas of the resist composition exposed to the radiation become less soluble to a developer solution (e.g., a crosslinking reaction occurs), while the unexposed areas of the photoresist coating remain relatively soluble to such a solution. Thus, treatment of an exposed negative-working resist with a developer causes removal of the unexposed areas of the photoresist coating and the formation of a negative image in the coating, thereby uncovering a desired portion of the underlying substrate surface on which the photoresist composition was originally deposited.

the use of negative-working acid-sensitive photoresist compositions is known in the art. Most of these prior art photoresist compositions use a crosslinker that reacts with the polymeric binder resin to form an insoluble film comprising a higher molecular weight polymer.

Major developments in resist production and chemistry have focused on the silicon Integrated Circuit (IC) chip industry. For higher resolutions, this technology is moving from i-line lithography to shorter wavelength (deep UV) lithography, such as 248nm, 193nm, and 157 nm. Several generations of advanced deep UV resist materials have been developed. Using 248 and 193nm lithography based on chemically amplified resists, Critical Dimensions (CD) well below 0.2 μm are achieved in production.

On the other hand, however, applications such as the processing of GaAs or compound III-V substrates, Light Emitting Diodes (LEDs), high power LEDs, and Organic Light Emitting Diodes (OLEDs) still use essentially conventional i-line lithography and i-line resist materials without chemical enhancement. For these applications, the deposition of metal (also referred to as metallization) on a semiconductor substrate covered by a patterned photoresist is typically performed by Chemical Vapor Deposition (CVD) techniques, such as LPCVD. Sputter metal deposition can also be used to deposit thick uniform metal layers. Another technique for metallization is Vacuum Deposition (VD), in particular by electron beam induction (EBPVD).

Electron beam physical vapor deposition or EBPVD is a form of physical vapor deposition in which a target anode is bombarded with an electron beam emitted from a charged tungsten filament under high vacuum. The electron beam causes the atoms from the target to transform into a gas phase. These atoms are then precipitated in solid form, coating everything in the vacuum chamber (in the line of sight) with a thin layer of anode material.

Sputter metal deposition is performed in a vacuum chamber wherein an electrically grounded metal target wafer is bombarded with charged argon gas to sputter metal atoms and deposit them on the target wafer.

CVD metal deposition occurs by reaction of the reactive gas with the semiconductor substrate itself under reduced pressure or by reaction with a second reactive gas, in both cases producing a metal deposit. For example, in the first instance, WF is₆Gaseous SiF pumped away can be produced by reaction with Si to produce a metallic W deposit and as a reaction product₆While deposition is effected on a silicon substrate. An example of the second case is WF₆And H₂to deposit metal W and to produce gaseous HF as a reaction product which is pumped away.

Using a patterned resist, CVD or sputtered metal can be used to metalize areas of the substrate not covered by the resist. However, after this step, the remaining resist may be removed by using a chemical etchant or an adhesive tape applied to the surface of the resist to remove it. In either case, lift-off may be facilitated by using a lift-off process, in which a resist pattern is initially created prior to metallization, which has undercuts at the resist substrate interface. In the case of using a chemical etchant, such as a stripper, it is easier to remove the remaining resist because the undercut portions of the resist are not metallized to allow the stripper to attack and remove the resist. Straight wall resist profiles (profiles) and profiles with poor undercutting have significant metallization at the sidewalls of these profiles, making resist removal with strippers much more difficult or impossible. Similarly, when removing resist using the sticky tape approach, the more pronounced the undercutting of the profiles, the easier these can be removed without leaving a significant amount of residual resist on the substrate. This minimization of residue, in turn, allows for faster removal of such residue in subsequent stripping operations. Conventional approaches for obtaining a sloped profile with some undercut resist features for lift-off purposes rely on control of optical conditions during exposure, such as exposure tool defocus. Such "optical" schemes are inherently limited by the optics physics itself to the extent that undercutting is possible.

there is a need for highly sensitive i-line chemically amplified negative resists that produce significant undercutting during imaging, wherein further such undercutting has significant exposure latitude during processing of the resist, wherein these properties are provided by the formulation itself during normal processing and are not dependent on optical control of exposure tool parameters, such as defocus settings. Described herein are novel highly sensitive chemically amplified i-line photoresist formulations that unexpectedly produce significant undercutting with wide exposure latitude upon exposure and processing. This significant undercut can facilitate the lift-off process after metallization of these resist patterns.

disclosure of Invention

Drawings

Figure 1 shows a non-limiting example of an i-line (broadband) photoacid generator that generates sulfonic acids and other strong acids.

Figure 2 shows a non-limiting example of an i-line (broadband) trihalophotoacid generator that generates HCl or HBr.

FIG. 3 compares undercut lithographic performance when using photoresist formulations containing Monazoline C but no DI-dye compared to formulations containing both Monazoline C and DI-dye.

FIG. 4 compares undercut lithographic performance when using a photoresist formulation containing DI-dye but no Monazoline C compared to a formulation containing both Monazoline C and DI-dye.

FIG. 5 compares the undercut lithography performance of two photoresist formulations containing both Monazoline C and DI-dyes, but with one containing an HCl-generating I-line PAG and the second photoresist instead containing a sulfonic acid-generating I-line PAG.

FIG. 6 compares the undercut lithography performance of two photoresist formulations, example 7 using an AI quencher and example 8 using an MNNE quencher.

FIG. 7 compares the undercut lithographic performance of two photoresist formulations, comparative example 8 using a TPA quencher and example 9 using a 2EI quencher.

FIG. 8 shows the extended undercut lithography performance of two photoresist formulations, example 10 using N-methyldipropylamine quencher and example 11 using N, N-diisopropylethylamine quencher.

FIG. 9 shows the undercut lithographic performance of two photoresist formulations of examples 12 and 13 using triisobutylamine quencher at two different concentrations.

Fig. 10 compares the undercut profiles of two photoresist formulations of examples 14 and 15 using different dyes, coumarin 7 dye and DI dye, respectively.

Detailed description of the invention

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are not restrictive of the subject matter as claimed. In this application, unless specifically stated otherwise, the use of the singular includes the plural, the words "a" or "an" mean "at least one", and the use of "or" means "and/or". Furthermore, the use of the term "including" as well as other forms is not limiting. Unless explicitly stated otherwise, terms such as "element" or "component" also encompass both elements and components comprising one unit, and elements or components comprising more than one unit. As used herein, unless otherwise noted, the conjunction "and" is intended to be inclusive and the conjunction "or" is not intended to be exclusive. For example, the phrase "or, alternatively" is intended to be exclusive. As used herein, the term "and/or" refers to any combination of the foregoing elements, including the use of a single element.

The section headings used herein are for organizational purposes and are not to be construed as limiting the subject matter described. All documents, or portions of documents, cited in this application, including but not limited to patents, patent applications, articles, books, and treatises, are hereby incorporated by reference in their entirety for any purpose. In the event that one or more of the incorporated documents and similar materials define a term in a manner inconsistent with the definition of that term in this application, then the present application controls.

Herein, unless otherwise specified, "alkyl" refers to a hydrocarbon group that may be straight-chain, branched (e.g., methyl, ethyl, propyl, isopropyl, t-butyl, etc.), or cyclic (e.g., cyclohexyl, cyclopropyl, cyclopentyl, etc.), polycyclic (e.g., norbornyl, adamantyl, etc.). These alkyl moieties may be substituted or unsubstituted as described below. The term "alkyl" refers to such moieties having C-1 to C-20 carbons. It is understood that for structural reasons, straight chain alkyls start with C-1, while branched alkyls and linear start with C-3, and multi-ring alkyls start with C-5. It is further understood that, unless otherwise indicated, the following moieties derived from alkyl groups, such as alkoxy groups, haloalkoxy groups, have the same carbon number range. If the length of the alkyl group is specified differently from above, the above definition of alkyl group still holds, considering that it contains all types of alkyl moieties as described above, and structural considerations regarding the lowest carbon number of a given type of alkyl group still apply.

Alkyloxy (also known as alkoxy) refers to an alkyl group as defined above (e.g., methoxy, ethoxy, propoxy, butoxy, 1, 2-isopropoxy, cyclopentyloxy, cyclohexyloxy, and the like) attached through an oxygen (-O-) moiety. These alkoxy moieties may be substituted or unsubstituted as described below.

Halo or halo refers to halogen, F, Cl, Br, I, attached to the organic moiety by a bond.

Haloalkyl refers to a straight, cyclic or branched chain saturated alkyl group as defined above, wherein at least one of the hydrogens has been replaced by a halo group selected from F, Cl, Br, I or (if more than one halo moiety is present) a mixture of these. Fluoroalkyl groups are a particular subclass of these moieties.

Fluoroalkyl refers to a straight, cyclic, or branched chain saturated alkyl group as defined above in which a hydrogen has been partially or completely replaced by a fluorine (e.g., trifluoromethyl, perfluoroethyl, 2,2, 2-trifluoroethyl, perfluoroisopropyl, perfluorocyclohexyl, etc.). If not perfluorinated, these fluoroalkyl moieties may be substituted or unsubstituted as described below.

Fluoroalkoxy refers to a fluoroalkyl group as defined above attached through an oxygen (-O-) moiety that can be fully fluorinated (also known as perfluorinated) or alternatively partially fluorinated (e.g., trifluoromethoxy, perfluoroethoxy, 2,2, 2-trifluoroethoxy, perfluorocyclohexyloxy, etc.). If not perfluorinated, these fluoroalkyl moieties may be substituted or unsubstituted as described below.

When reference is made herein to alkyl, alkoxy, fluoroalkyl, fluoroalkoxy moieties having a range of possible carbon atoms starting from C-1, such as "C-1 to C-20 alkyl" or "C-1 to C-20 fluoroalkyl" as non-limiting examples, this range includes straight chain alkyl, alkoxy, fluoroalkyl and fluoroalkoxy groups starting from C-1, but only branched alkyl, branched alkoxy, cycloalkyl, cycloalkoxy, branched fluoroalkyl and cyclic fluoroalkyl groups starting from C-3 are specified.

The term "alkylene" herein refers to a hydrocarbon group which may be linear, branched or cyclic having two or more points of attachment (e.g., those having two points of attachment: methylene, ethylene, 1, 2-isopropylene, 1, 4-cyclohexylene, etc.; those having three points of attachment: 1,1, 1-substituted methane, 1,1, 2-substituted ethane, 1,2, 4-substituted cyclohexane, etc.). Also herein, when specifying possible carbon ranges, such as C-1 to C-20 as non-limiting examples, such ranges include straight chain alkylene groups starting from C-1, but only branched chain alkylene or cycloalkylene groups starting from C-3. These alkylene moieties may be substituted or unsubstituted as described below.

the term "aryl" or "aromatic group" as used herein refers to such groups containing 6 to 24 carbon atoms and includes phenyl, tolyl, xylyl, naphthyl, anthracenyl, biphenyl, bis-phenyl, tris-phenyl, and the like. These aryl groups may be further substituted with any suitable substituent, such as alkyl, alkoxy, acyl, or aryl groups mentioned above.

The term "arylene" refers herein to an aromatic hydrocarbon moiety having two or more points of attachment (e.g., 2-5), which moiety can be a mono-benzene moiety (e.g., two points of attachment 1, 4-phenylene, 1, 3-phenylene, and 1, 2-phenylene; three points of attachment 1,2, 4-substituted benzene, 1,3, 5-substituted benzene, etc.), a polycyclic aromatic moiety having two points of attachment, such as derived from naphthalene, anthracene, pyrene, etc., or a polyphenylenic ring (e.g., biphenylene) in a chain having two points of attachment. In that case where the aromatic moiety is a fused aromatic ring, these may be referred to as fused ring arylene groups, more specifically as, for example, naphthylene (napthalenylene), anthracenylene (anthrylene), pyrenylene (pyrenylene), and the like. The fused ring arylene groups can be substituted or unsubstituted as described below, and in addition, these fused ring arylene groups can also contain hydrocarbon substituents having two attachment points on the fused rings to form additional aliphatic or unsaturated rings to form rings having 5 to 10 carbon atoms by attachment to the fused rings.

Unless otherwise described, the term "PAG" herein refers to a photoacid generator (also known as a photoacid) that can generate an acid under 365nm and/or broadband radiation. The acid may be sulfonic acid, HCl, HBr, HAsF₆and the like.

The term "fused aromatic ring" as used herein refers to a carbon-based polycyclic aromatic compound (e.g., naphthalene, anthracene, etc.) containing 2-8 carbon-based aromatic rings fused together, which may have a single point of attachment to an organic moiety as part of an aryl moiety, such as a pendant fused aromatic ring aryl on a photoacid generator (PAG), or two points of attachment as part of an arylene moiety, such as in a spacer in a substituent attached to a PAG. In PAGs, such substituents, together with other substituents that can interact by resonance delocalization, impart higher absorbance at 365nm and/or broadband radiation and result in being more effective at these wavelengths.

The term "arene (arene)" herein comprises an aromatic hydrocarbon moiety containing 1 ring or 2 to 8 carbon-based aromatic rings fused together.

The term "heteroarene" in this context means an arene containing 1 or more trivalent or divalent heteroatoms, respectively, in such a way as to preserve its aromaticity. Examples of such heteroatoms are N, O, P and S. As a non-limiting example, such heteroarenes may contain 1 to 3 such heteroatoms.

Unless otherwise indicated herein, the term "substituted" in reference to aryl, alkyl, alkoxy, fluoroalkyl, fluoroalkoxy, fused aromatic ring, aromatic hydrocarbon, heteroaromatic hydrocarbon means one of these moieties which also contains one or more substituents selected from the group consisting of unsubstituted alkyl, substituted alkyl, unsubstituted aryl, alkoxyaryl (alkyl-O-aryl-), dialkoxyaryl ((alkyl-O-)₂Aryl), haloaryl, alkoxy, alkylaryl, haloalkyl, halo, hydroxy, cyano, nitro, acetyl, alkylcarbonyl, formyl, vinyl (CH)₂CH-, phenyl vinyl (Ph-CH-), aryl vinyl (aryl-CH-) and substituents containing ethenylidenearylene moieties (e.g., Ar (-CH-Ar-)_zWherein z is 1 to 3). Specific non-limiting examples of substituted aryl and substituted arylvinyl substituents are as follows:

In other cases, substituted aryl groups and substituted vinyl groups, wherein the substituents are selected from any of the above substituents. Similarly, the term "unsubstituted" refers to those same moieties wherein no substituents other than hydrogen are present.

The term "quencher system" refers to a combination of basic components (e.g., amines) in a resist formulation that can be used to capture the acid generated by a photoacid generator during exposure to i-line or broadband radiation.

The term "solid component" refers to a component of the photoresist formulation that is not a solvent. Such components may be solid or liquid.

The present invention relates to a chemically amplified negative-working, aqueous, alkali-soluble, radiation-sensitive photoresist composition and a process for producing microelectronic devices using such photoresist, which is particularly useful for photoresists having applicability in lift-off applications used in metallization processing in the manufacture of conventional IC and LED devices. The photoresists of the invention comprise a phenolic film-forming binder resin having a ring-bonded hydroxyl group, an etherified melamine crosslinker, a photoacid generator, a dye, and an amine quencher, wherein the specific combination of amine quencher and dye is selected to provide good photoresist properties for the lift-off applications mentioned above.

In one of its embodiments, the present invention relates to a chemically amplified negative-working photoresist composition imageable with 365nm radiation and developable in aqueous base, comprising solid components a), b), c), d) and e) and a solvent component f);

a) An aqueous alkali soluble phenolic film forming polymer binder resin having a ring-bonded hydroxyl group;

b) A photoacid generator that forms an amount of acid sufficient to initiate crosslinking of the film-forming binder resin upon exposure to 365nm radiation;

c) Carbon formation upon exposure to the acid from step b) generated by exposure to radiationA crosslinker that is ionic and comprises an etherified melamine;

d) Having about 1.74X10 as measured in PGMEA⁴To about 0.94X10⁴Mole of^-1L cm^-1A dye having a molar attenuation coefficient at 365 nm;

e) a quencher system consisting essentially of an amine quencher or a mixture of such amine quenchers having about 6A pKa in water of from 0 to about 12, wherein the amine quencher has a boiling point of at least 100 ℃ at 1 atmosphere and is substituted with a C2-C25 alkyl substituent, - (CH)₂)_nOH substituent, - (CH)₂)_n-O-(CH₂)_n’-O-R ' or a mixture of these substituents, wherein n and n ' are independently an integer from 2 to 4 and R ' is C1-C4 alkyl or H; and

f) A photoresist solvent.

In certain embodiments described herein of such inventive compositions, no other amine quenchers are present, other than those specified in the quencher systems as outlined in solid component e) above. In particular, it has been found that the presence of amines having a pKa below about 6.0 can result in a loss of the ability of the novel photoresist composition, when coated on a substrate and lithographically processed, to form resist imaged resist profiles with substantial undercutting at the substrate resist film interface, where the degree of undercut (extent) has large exposure latitude. In another aspect thereof, low boiling point amines having boiling points below about 100 ℃ are also undesirable because they can be easily lost from the resist film during photoresist coating and associated baking steps used to process the resist before and after exposure to radiation.

In another embodiment of the above photoresist compositions and other photoresist compositions described herein, the solid component d), i.e., the dye, has a molar attenuation coefficient of about 1.61X10⁴To about 1.07X10⁴Mole of^-1L cm^-1. In another embodiment, the molar attenuation coefficient is about 1.47X10⁴To about 1.27X10⁴Mole of^-1L cm^-1. In yet another embodiment about 1.41X10⁴To about 1.27X10⁴Mole of^-1L cm^-1. In yet another embodiment about 1.37X10⁴To about 1.31X10⁴Mole of^-1L cm^-1. In yet another embodiment about 1.36X10⁴To about 1.32X10⁴Mole of^-1L cm^-1. In a final embodiment, the molar attenuation coefficient as measured in PGMEA is about 1.34X10⁴Mole of^-1L cm^-1。

In another embodiment of the above photoresist composition, the solid component e), i.e., the quencher system, consists solely of an amine quencher having a pKa in water of from about 6.0 to about 12 or a mixture of such amine quenchers, wherein the amine quencher has a boiling point of at least 250 ℃ at 1 atmosphere and comprises at least one C2-C25 alkyl substituent, - (CH)₂)_nOH substituent or- (CH)₂)_n-O-(CH₂)_n’-O-R ' substituents or mixtures comprising these substituents, wherein n and n ' are independently an integer from 2 to 4 and R ' is C1-C4 alkyl or H.

In another embodiment of the above photoresist composition, the solid component e), i.e., the quencher system, consists solely of an amine quencher having a pKa in water of from about 6.0 to about 12, or a mixture of such amine quenchers, wherein the amine quencher has a boiling point of at least 100 ℃ at 1 atmosphere and comprises at least one C2-C25 alkyl substituent, - (CH)₂)_nOH substituent, or- (CH)₂)_n-O-(CH₂)_n’-O-R ' substituents or mixtures of these substituents, wherein n and n ' are independently integers from 2 to 4 and R ' is C1-C4 alkyl or H.

In another embodiment of the above photoresist composition, the solid component e), i.e., the quencher system, consists solely of an amine quencher having a pKa in water of from about 6.0 to about 12 or a mixture of such amine quenchers, wherein the amine quencher has a boiling point of at least 100 ℃ at 1 atmosphere and comprises at least one C10-C25 alkyl substituent or- (CH)₂)_nAn OH substituent or a mixture of such substituents, wherein n is an integer from 2 to 4.

in another embodiment of the above composition, the solid component e) is as follows: wherein further, said amine quenchers or mixtures of such amine quenchers wherein said amine quenchers have a boiling point of at least 100 ℃ at 1 atmosphere are those having structure (1), wherein R is₁And R_1aMay be independently selected from H, C1 to C5 alkyl or aryl, further of whichEarth, R₁And R_1aAt least one of which is a C10 to C25 alkyl substituent or- (CH)₂)_nAn OH substituent, wherein n is an integer from 2 to 4, and further wherein positions 3 and 2 are connected by a single or double bond. In other aspects of this embodiment, the quencher has a boiling point of at least 150 ℃, in another embodiment at least 200 ℃, in another embodiment at least 250 ℃ and in yet another embodiment at least 300 ℃.

In another embodiment of the above photoresist composition, the solid component d), i.e., the dye, is soluble in an aqueous base; and further wherein the solid component e) is as follows: wherein further said amine quenchers or mixtures of such amine quenchers are those having structure (1), wherein R is₁And R_1amay be independently selected from H, C1 to C5 alkyl or aryl, wherein further, R₁and R_1aAt least one of which is a C10 to C25 alkyl substituent or- (CH)₂)_nAn OH substituent, wherein n is an integer from 2 to 4, and further wherein positions 3 and 2 are connected by a single or double bond.

In another embodiment of the above composition, the solid component b), i.e., the photoacid generator, is a trihalomethyl derivative (halo ═ Cl or Br) -based photoacid generator that forms an amount of acid sufficient to initiate crosslinking of the film-forming binder resin upon exposure to 365nm radiation and/or broadband radiation, wherein the halo moiety is chlorine or bromine; and further wherein the solid component e) is as follows: wherein further said amine quenchers or mixtures of such amine quenchers are those having structure (1), wherein R is₁And R_1aMay be independently selected from H, C1 to C5 alkyl or aryl, wherein further, R₁and R_1aAt least one of which is a C10 to C25 alkyl substituent or- (CH)₂)_nAn OH substituent, wherein n is an integer from 2 to 4, and further wherein positions 3 and 2 are defined bySingle or double bond linkage.

In another embodiment of the above photoresist composition, the solid component b), i.e., the photoacid generator, is a trihalomethyl derivative (halo ═ Cl or Br) -based photoacid generator that forms an acid upon exposure to 365nm radiation in an amount sufficient to initiate crosslinking of the film-forming binder resin, wherein the halo moiety is chlorine or bromine; and further wherein the solid component e) is as follows: wherein further said amine quenchers or mixtures of such amine quenchers are those having structure (1), wherein R is₁And R_1aMay be independently selected from H, C1 to C5 alkyl or aryl, wherein further, R₁And R_1aAt least one of which is a C10 to C25 alkyl substituent or- (CH)₂)_nAn OH substituent, wherein n is an integer from 2 to 4, and further wherein positions 3 and 2 are connected by a single or double bond.

in any of the above photoresist compositions, the solid component a), i.e., the binder resin, may be an alkali soluble novolak resin. Non-limiting examples of alkali soluble novolak resins include repeating units having bridges and phenolic compounds. Suitable phenolic compounds include, but are not limited to, phenol, cresols, substituted and unsubstituted resorcinols, xylenols, substituted and unsubstituted benzenetriols, and combinations thereof. Specific non-limiting examples of suitable phenols are bisphenol A, bisphenol F, bisphenol AP, bisphenol AF, bisphenol B, bisphenol BP, bisphenol C, bisphenol E, bisphenol S, phenol, m-cresol, p-cresol, o-cresol, 3, 5-dimethylphenol, 3-ethylphenol, 4-ethylphenyl, 3, 5-diethylphenol, and combinations thereof. Novolak polymers are typically made by the polycondensation of a phenolic compound and an aldehyde, such as formaldehyde, acetaldehyde or substituted or unsubstituted benzaldehyde, or a condensation product of a phenolic compound and a substituted or unsubstituted methylol compound, using an acid catalyst. The bridge described above may comprise methylene or methine (methyl). The novolak polymer can also be made as a condensation product of ketones such as acetone, methyl ethyl ketone, acetophenone, and the like. The catalyst may include lewis acids, bronsted acids, dications and trication metal ions, and the like. For example, without limitation, can beWith aluminum chloride, calcium chloride, manganese chloride, oxalic acid, hydrochloric acid, sulfuric acid, methanesulfonic acid, trifluoromethanesulfonic acid, or a combination comprising any of the foregoing. Examples of suitable novolak polymers include those obtained by a condensation reaction between a phenolic compound (e.g., phenol, o-cresol, m-cresol, p-cresol, 2-5-xylenol, bisphenol a, bisphenol F, bisphenol AP, bisphenol AF, bisphenol B, bisphenol BP, bisphenol C, bisphenol E, bisphenol S, phenol, m-cresol, p-cresol, o-cresol, 3, 5-dimethylphenol, 3-ethylphenol, 4-ethylphenyl, 3, 5-diethylphenol, etc.) and an aldehyde compound (e.g., formaldehyde) in the presence of an acid or a polyvalent metal ion catalyst. An exemplary weight average molecular weight of the alkali soluble novolac polymer may be from 1,000 to 30,000 daltons. Further exemplary weight average molecular weights may range from 1,000 to 20,000 daltons. Still further exemplary weight average molecular weights can be from 1,500 to 10,000 daltons. An exemplary bulk solubility rate (bulk solubilizers) of the novolak polymer in a 2.38% aqueous tetramethylammonium hydroxide solution is(Angstrom units/second) toA further exemplary bulk dissolution rate isToYet a further exemplary bulk dissolution rate isToObtainable from a single novolak polymer or a blend of novolak polymers each comprising m-cresol repeating unitsYet further exemplary of the rate of dissolution of the body. Exemplary cresol novolak polymers may contain, on a mole percent cresol basis, 0% to 60% p-cresol, 0% to 20% o-cresol, and 0% to 80% m-cresol. Further exemplary cresol novolak polymers may contain 0% to 50% p-cresol, 0% to 20% o-cresol, and 50% to 100% m-cresol. The repeat units in the novolac polymer are defined by the composition of the polymer, so that, for example, p-cresol can be introduced by polymerization with an aldehyde or by dimethylol-p-cresol. In addition, the cresol novolak polymer may contain other phenolic compounds such as phenol, xylenol, resorcinol, benzenetriol, and the like.

In one embodiment of the above composition, wherein the solid component a), i.e. the binder resin, is an alkali soluble novolak resin derived from the copolymerization of bisphenol a, formaldehyde and m-cresol. The binder resin comprises a repeating unit having the general structure (2), wherein q represents the number of repeating units in the polymer chain and-CH₂The attachment of the repeating units may be in the ortho or para position. The binder resin may also contain a branched structure in which an additional 1 to 2 ortho positions on the repeating units derived from bisphenol A are attached to-CH₂-a repeating unit of-CH₂-the recurring unit is linked to another recurring unit derived from m-cresol or bisphenol a. Furthermore, additional meta-or para-positions on the repeat units derived from m-cresol may be attached to-CH₂-a repeating unit of-CH₂-the recurring unit is linked to another recurring unit derived from m-cresol or bisphenol a.

In one embodiment of the novolac resin having structure (2), it has a Mw of about 20,000 to about 5,000 and a Polydispersity (PD) of about 3 to about 5. In another embodiment of this aspect of the invention, the novolac resin has a Mw of about 15,000 to about 3,000. In another embodiment, the Mw is from about 12,000 to about 5,000. In yet another embodiment, the Mw ranges from about 11,000 to about 7,000. In yet another embodiment, the Mw ranges from about 10,000 to about 8,000. In another embodiment, the Mw is about 9,000 and the PD is about 4.1.

In one embodiment of the above photoresist composition, the solid component b), i.e., the photoacid generator (PAG), is one wherein the photoacid generator generates a photoacid under 365nm and/or broadband radiation, such as a sulfonic acid, e.g., an alkyl, aryl, or fluoroalkyl sulfonic acid, a perfluorosulfonic acid, an inorganic acid, e.g., HAsF₆、HSbF₆HPF6 or derived from tetrakis (perfluorophenyl) borate, H (perf-Ph)₄B or analogous tetrakis (perfluoroaryl) borates, H (perf-aryl)₄b acid. Non-limiting examples of such PAGs are photoacid generators, including various photoacid generators, such asSalts, dicarboxyimidosulfonate, oxime sulfonate, diazo (sulfonylmethyl) compounds, disulfonylmethylenehydrazine compounds, nitrobenzyl sulfonate, biimidazole compounds, diazomethane derivatives, glyoxime derivatives, β -ketosulfone derivatives, disulfone derivatives, sulfonate derivatives, imidosulfonate (imidoyl sulfonate) derivatives, compounds, diazonaphthoquinone sulfonate, or combinations thereof. Such photoacid generators may be inherently sensitive to 365nm and/or broadband radiation by appropriate substitution as is known in the art. More specifically, these may be, for example, as non-limiting examples, substituted or unsubstituted triarylsulfonium salts of organic sulfonic acids in which at least one aryl moiety having a conjugated aryl group is contained in the triarylsulfonium moiety or its corresponding acid anion, wherein the conjugated aryl moiety is selected from phenyl rings having at least one substituent selected from the group consisting of: aryloxy, alkoxy, nitro, cyano, acetyl, aryl, alkenyl, alkoxyaryl (alkyl-O-aryl-), dialkoxyaryl ((alkyl-O-)₂-aryl), or wherein alternatively the conjugated aryl moiety is a substituted or unsubstituted fused aromatic ring moiety containing 2 to 4 rings. Such substituents may be attached via a bifunctional moiety capable of resonance delocalization, e.g.Arylene radicals, including arylene radicals derived from condensed aryl radicals, or moieties such as ethenylene (-C-), vinyl (CH)₂CH-, phenyl vinyl (Ph-CH-), aryl vinyl (aryl-CH-) and substituents containing ethenylidenearylene moieties (e.g., Ar (-CH-Ar-)_zWherein z is 1 to 3). Specific non-limiting examples of substituted aryl and substituted arylvinyl substituents are as follows:

other common PAGs that are sensitive to 365nm and/or broadband radiation are substituted or unsubstituted 1, 3-dioxo-1H-benzo [ de ] isoquinolin-2 (3H) -yl organosulfonates. Fig. 1 shows non-limiting examples of the above PAGs. These PAGs may also have substituents as described above.

In another embodiment of such a photoresist composition, the photoacid generator can also be one that is not directly sensitive to i-line or broadband radiation, but has been sensitized to be sensitive to this radiation with a photosensitizer that extends the effective wavelength and/or energy range. Such photosensitizers can be, but are not limited to, substituted and unsubstituted anthracenes, substituted and unsubstituted phenothiazines, substituted and unsubstituted perylenes, substituted and unsubstituted pyrenes, and aromatic carbonyl compounds such as benzophenones and thioxanthones, fluorenes, carbazoles, indoles, benzocarbazoles, acridone, chlorpromazine, equivalents thereof, or combinations of any of the foregoing.

In another embodiment of the present invention, the solid component b) is the trihalomethyl derivative, and it may be one containing 1 to 3 trihalomethyl substituents. In another embodiment of this aspect of the invention, the trihalomethyl derivative is an arene or substituted arene containing from 1 to 3 trihalomethyl substituents. In another aspect of this embodiment, the trihalomethyl derivative may be a derivative containing 1 to 3 sulfone spacers (-SO)₂-) is attached to the aromatic or substituted aromatic moiety.

In another embodiment of the present invention wherein the solid component b) is the trihalomethyl derivative, it may be a trihalomethyl derivative of a heteroarene or substituted heteroarene containing 1 to 3 trihalomethyl moieties.

In another embodiment of the present invention wherein said solid component b) is said trihalomethyl derivative, it may be a trihalomethyl derivative containing 1 to 3 sulfone spacers (-SO)₂-) a heteroarene or substituted heteroarene with a trihalomethyl substituent attached to the heteroarene or substituted heteroarene.

In another embodiment of the present invention wherein the solid component b) is the trihalomethyl derivative, it may be a derivative having the structure (3) wherein R is₂Is a substituted or unsubstituted alkenyl or substituted or unsubstituted aryl or a substituted or unsubstituted fused aromatic ring moiety containing 2 to 4 rings, and Y is oxygen or nitrogen, and X is Cl or Br.

In another embodiment of the present invention wherein said solid component b) is said trihalomethyl derivative isAzoles or substituted with structure (4)Derivatives of oxazinones (oxazone), wherein R₃Is a substituted or unsubstituted alkenyl group or a substituted or unsubstituted aryl group, and X is Cl or Br.

In another embodiment of the present invention wherein the solid component b) is the trihalomethyl derivative, it may be a trihalomethyl derivative of a substituted triazine containing 1 or 2 trihalomethyl moieties.

in which the solid component b) is the trihaloIn another embodiment of the present invention of the methyl-substituted derivative, it may be a trihalomethyl derivative having the structure (5) wherein X is Br or Cl, and R is₄Is an unsubstituted or substituted alkenyl group, an unsubstituted aryl group or a substituted aryl moiety, or a substituted or unsubstituted fused aromatic ring moiety containing 2 to 4 rings.

In another embodiment of the present invention wherein the solid component b) is the trihalomethyl derivative, it may be a derivative having structure (6), and R is_4aIs an unsubstituted or substituted alkenyl group or an unsubstituted aryl or substituted aryl moiety.

In another embodiment of the present invention wherein said solid component b) is said trihalomethyl derivative, it may be a derivative having the structure (7) wherein o is 1 or 2, X is Cl or Br, and further wherein R is₅is a C4 or C5 cyclic aliphatic ether moiety containing one or two olefin linkages substituted with hydrogen or C1 to C2 alkyl.

In another embodiment of the present invention wherein said solid component b) is said trihalomethyl derivative, it may be a derivative having the structure (8) wherein o is 1 or 2, X is Cl or Br, and R is₆Is hydrogen or C1 to C3 alkyl.

In another embodiment of any of the above aspects of the invention wherein the solid component b) is the trihalomethyl derivative, X is Cl.

in another embodiment of any of the above aspects of the invention wherein said solid component b) is said trihalomethyl derivative, X is Br.

In another embodiment of the present invention wherein the solid component b) is the trihalomethyl derivative, it may be a derivative having structure (9) wherein X is Cl or Br, and further wherein R is₆Is hydrogen or C1 to C3 alkyl. In one aspect of this embodiment, X is Cl, and in another embodiment X is Br.

In another embodiment of the present invention wherein the solid component b) is a trihalomethyl derivative having the structure (8) or (9) above, wherein R is₆Is hydrogen.

In another embodiment of the present invention wherein the solid component b) is a trihalomethyl derivative having the structure (8) or (9) above, wherein R is₆Is methyl.

In another embodiment of the present invention wherein the solid component b) is a trihalomethyl derivative having the structure (8) or (9) above, wherein R is₆Is ethyl.

In another embodiment of the present invention, the solid component b) is a trihalomethyl derivative having the structure (10).

In another embodiment of any of the above aspects of the invention, the solid component c), i.e. the crosslinker, comprises an etherified melamine, wherein such etherified aminoplast crosslinker comprises a carbon donating in the presence of an acid generated by radiation, preferably imaging radiationan organic oligomer or polymer which is ionic and which serves to crosslink the film-forming binder resin. This causes the adhesive in the exposed areasThe resin is insoluble in alkaline media. Such cross-linking agents can be prepared from a variety of aminoplasts in combination with compounds containing multiple hydroxyl, carboxyl, amide or imide groups or low molecular weight polymers. Preferred amino oligomers or polymers are aminoplasts obtained by reaction of amines, such as urea, melamine or glycoluril (glycourea), with aldehydes, such as formaldehyde. Such suitable aminoplasts include urea-formaldehyde, melamine-formaldehyde, benzoguanamine-formaldehyde, and glycoluril-formaldehyde resins and combinations of any of these. One particularly preferred aminoplast is hexa (methoxymethyl) melamine oligomer.

In another embodiment of any of the above aspects of the present invention, the solid component c), i.e., the crosslinking agent, comprises an etherified melamine selected from those having structure (11), oligomers formed from (11), or mixtures of these; wherein R is₇Is C1 to C4 alkyl, H or a moiety representing structure (11a), whereinRepresents the point of attachment of the structural moiety (11a) to the structure (11), wherein R_7aIs C1 to C alkyl, H, or another moiety representing structure (11 a).

In another embodiment of any of the above aspects of the present invention, the solid component c), i.e. the crosslinking agent, comprises an etherified melamine selected from those having structure (12), oligomers formed from (12), or mixtures of these; wherein R is₈Is methyl, H or a moiety representing structure (12a), whereinRepresents the point of attachment of the structural moiety (12a) to the structure (12), wherein R_8aIs methyl, H or represents a moiety of another structure (12 a).

In a particularly preferred embodiment of the present invention, the solid component d), i.e. the dye, has about 1.74X10 as measured in PGMEA⁴To about 0.94X10⁴Mole of^-1L cm^-1The molar attenuation coefficient at 365 nm. Such I-line sensitive dyes (also known as 365nm) may include, for example, sudan orange G; martins yellow; dye O-PM ester; 2,3 ', 4, 4' -tetramethylhydroxybenzophenone, 9-anthracenemethanol; phenoxymethylanthracene; 9, 10-diphenylanthracene; substituted phenanthreneanthracenes and substituted biphenyls, and the like.

In another embodiment of any of the above aspects of the invention, the solid component d), i.e. the dye, is an aqueous alkali soluble dye having the structure (13) wherein m1 and m2 are independently 1 to 3, in another aspect of this embodiment m1 and m2 are both 2, in another aspect of this embodiment m1 is 1 and m2 is 3,

In another embodiment, in structure (13), m1 and m2 can be 0 to 3, provided that at least one of m1 or m2 is not 0.

In another embodiment of the present invention, the solid component d), i.e. the dye, is an aqueous alkali-soluble dye having the structure (14).

In another embodiment of any of the above aspects of the invention, the solid component e) having a boiling point of at least 100 ℃ at 1 atmosphere, i.e., the quencher system, consists only of a compound or mixture of compounds having structure (1), which is one wherein R is₁is a C15 to C20 alkyl moiety and R_1aIs- (CH)₂)_nOH, wherein n is an integer from 2 to 4, and further wherein positions 3 and 2 are connected by a single bond. In another aspect of this embodiment, the quencher has a boiling point of at least 150 ℃, in another embodiment at least 200 ℃, in another embodiment at least 250 ℃ and in yet another embodiment at least 300 ℃.

in another embodiment of any of the above aspects of the invention, the solid component e) having a boiling point of at least 100 ℃ at 1 atmosphere, i.e. the quencher system, consists solely of a compound or mixture of compounds having structure (1), which has one compound of structure (1), wherein R is_1aIs- (CH)₂)_nOH, and wherein n is 2 or 3, and further wherein positions 3 and 2 are connected by a single bond. In another aspect of this embodiment, the quencher has a boiling point of at least 150 ℃, in another embodiment at least 200 ℃, in another embodiment at least 250 ℃ and in yet another embodiment at least 300 ℃.

In another embodiment of any of the above aspects of the invention, the solid component e) having a boiling point of at least 100 ℃ at 1 atmosphere, i.e., the quencher system, consists only of a compound or mixture of compounds having the structure (1), wherein R is_1aIs- (CH)₂)_nOH, and wherein n is 2, and further wherein positions 3 and 2 are connected by a single bond. In another aspect of this embodiment, the quencher has a boiling point of at least 150 ℃, in another embodiment at least 200 ℃, in another embodiment at least 250 ℃ and in yet another embodiment at least 300 ℃.

In another embodiment of any of the above aspects of the present invention, the solid component e), i.e., the quencher system, consists of a compound of structure (15).

In a further embodiment of the present invention, the solid component e) having a boiling point of at least 100 ℃ at 1 atmosphere, i.e.the quencher consists of only a compound or a mixture of compounds having the structure (1), wherein R₁Is a C15 to C20 alkyl moiety, and R_1aIs C1 to C5 alkyl, and further wherein positions 3 and 2 are connected by a single bond. In another aspect of this embodiment, the quencher has a boiling point of at least 150 ℃, in another embodiment at least 200 ℃, in another embodiment at least 250 ℃ and in yet another embodiment at least 300 ℃.

In another embodiment of the present invention, the solid component e), i.e.the quencher, consists solely of a compound or mixture of compounds having the structure (1) with a boiling point of at least 100 ℃ at 1 atmosphere, wherein R is₁Is a C15 to C20 alkyl moiety, and R_1ais C3 to C5 alkyl, and further wherein positions 3 and 2 are connected by a single bond. In another aspect of this embodiment, the quencher has a boiling point of at least 150 ℃, in another embodiment at least 200 ℃, in another embodiment at least 250 ℃ and in yet another embodiment at least 300 ℃.

In another embodiment of the present invention, the solid component e) having a boiling point of at least 100 ℃ at 1 atmosphere, i.e. the quencher, consists solely of a compound or mixture of compounds having the structure (1), wherein R₁Is a C15 to C20 alkyl moiety, and R_1aIs C4 to C5 alkyl, and further wherein positions 3 and 2 are connected by a single bond. In another aspect of this embodiment, the quencher has a boiling point of at least 150 ℃, in another embodiment at least 200 ℃, in another embodiment at least 250 ℃ and in yet another embodiment at least 300 ℃.

In another embodiment of any of the above aspects of the invention, the solid component e) having a boiling point of at least 100 ℃ at 1 atmosphere, i.e., the quencher, consists only of a compound or mixture of compounds having structure (1), wherein R is₁Is a C1 to C5 alkyl moiety or H, and R_1aIs- (CH)₂)_nOH, wherein n is an integer from 2 to 4, and further wherein positions 3 and 2 are connected by a double bond. At this pointin another aspect of the embodiments, the quencher has a boiling point of at least 150 ℃, in another embodiment at least 200 ℃, in another embodiment at least 250 ℃ and in yet another embodiment at least 300 ℃.

In another embodiment of any of the above aspects of the invention, the solid component e) having a boiling point of at least 100 ℃ at 1 atmosphere, i.e., the quencher, consists only of a compound or mixture of compounds having structure (1), wherein R is₁Is a C1 to C3 alkyl moiety or H, and R_1ais- (CH)₂)_nOH, wherein n is an integer from 2 to 4, and further wherein positions 3 and 2 are connected by a double bond. In another aspect of this embodiment, the quencher has a boiling point of at least 150 ℃, in another embodiment at least 200 ℃, in another embodiment at least 250 ℃ and in yet another embodiment at least 300 ℃.

In another embodiment of any of the above aspects of the invention, the solid component e) having a boiling point of at least 100 ℃ at 1 atmosphere, i.e., the quencher, consists only of a compound or mixture of compounds having structure (1), wherein R is₁is H and R_1aIs- (CH)₂)_nOH, wherein n is an integer from 2 to 4, and further wherein positions 3 and 2 are connected by a double bond. In another aspect of this embodiment, the quencher has a boiling point of at least 150 ℃, in another embodiment at least 200 ℃, in another embodiment at least 250 ℃ and in yet another embodiment at least 300 ℃.

In another embodiment of any of the above aspects of the present invention, the solid component e), i.e., the quencher, consists only of the compound of structure (16).

In another embodiment of the above aspect of the invention, the solid component e), i.e., quencher, having a boiling point of at least 100 ℃ at 1 atmosphere is that of a compound having a structure (1) wherein R1 is a C15 to C20 alkaneA base moiety, and R_1ais C3 to C5 alkyl, and further wherein positions 3 and 2 are connected by a double bond. In another aspect of this embodiment, the quencher has a boiling point of at least 150 ℃, in another embodiment at least 200 ℃, in another embodiment at least 250 ℃ and in yet another embodiment at least 300 ℃.

In another embodiment of the above aspect of the invention, the solid component e), i.e., the quencher, having a boiling point of at least 100 ℃ at 1 atmosphere is that of a compound having a structure (1) wherein R1 is a C15 to C20 alkyl moiety and R is a C15 to C20 alkyl moiety_1aIs C4 to C5 alkyl, and further wherein positions 3 and 2 are connected by a double bond. In another aspect of this embodiment, the quencher has a boiling point of at least 150 ℃, in another embodiment at least 200 ℃, in another embodiment at least 250 ℃ and in yet another embodiment at least 300 ℃.

In another embodiment of any of the above aspects of the invention, the solid component e), i.e., the quencher system, consists solely of a compound or mixture of compounds having a boiling point of at least 100 ℃ at 1 atmosphere having the structure (17), wherein n and n 'are independently integers of 2 to 4 and R' is C1-C4 alkyl or H. In another aspect of this embodiment, the quencher has a boiling point of at least 150 ℃, in another embodiment at least 200 ℃, in another embodiment at least 250 ℃ and in yet another embodiment at least 300 ℃.

In another embodiment of any of the above aspects of the invention, the solid component e) having a boiling point of at least 100 ℃ at 1 atmosphere, i.e., the quencher, consists only of a compound or mixture of compounds having structure (17) wherein n and n 'are 2 and R' is C1-C4 alkyl or H. In another aspect of this embodiment, the quencher has a boiling point of at least 150 ℃, in another embodiment at least 200 ℃, in another embodiment at least 250 ℃ and in yet another embodiment at least 300 ℃.

In another embodiment of any of the above aspects of the present invention, the solid component e), i.e., the quencher system, consists only of the compound having structure (18).

In another embodiment of any of the above aspects of the present invention, the solid component e), i.e., the quencher system, consists only of the compound having structure (20).

In another embodiment of any of the above aspects of the invention, the solid component e), i.e., the quencher system, consists solely of a compound or mixture of compounds having a boiling point of at least 100 ℃ at 1 atmosphere having the structure (21), wherein R is₉And R₁₀Independently selected from H or C-2-C25 alkyl, and further,Wherein at least one of R9 or R10 is C2-C25 alkyl.

In another embodiment of the above aspect of the invention, the solid component e), i.e., the quencher system wherein the quencher has a boiling point of at least 100 ℃ at 1 atmosphere, is that of a compound having the structure (1) wherein R is₁Is a C2 to C20 alkyl moiety, and R_1aIs C1 to C5 alkyl, and further wherein positions 3 and 2 are connected by a double bond.

In another embodiment of any of the above aspects of the present invention, the solid component e), i.e., the quencher system, consists only of the compound having structure (23).

In the above novel composition, the solid component may be dissolved in a solvent component f), which is an organic solvent. Examples of suitable organic solvents include, but are not limited to, butyl acetate, amyl acetate, cyclohexyl acetate, 3-methoxybutyl acetate, methyl ethyl ketone, methyl amyl ketone, cyclohexanone, cyclopentanone, ethyl-3-ethoxy propionate, methyl-3-methoxy propionate, methyl acetoacetate, ethyl acetoacetate, diacetone alcohol, methyl pivalate, ethyl pivalate, propylene glycol monomethyl ether, propylene glycol monoethyl ether, propylene glycol monomethyl ether propionate, propylene glycol monoethyl ether propionate, ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, diethylene glycol monomethyl ether, diethylene glycol monoethyl ether, 3-methyl-3-methoxybutanol, N-methylpyrrolidone, dimethyl sulfoxide, gamma-butyrolactone, propylene glycol methyl ether acetate, methyl ethyl acetate, methyl amyl ketone, methyl ethyl propionate, methyl acetoacetate, diacetone alcohol, methyl pivalate, methyl acetate, methyl propionate, propylene glycol, Propylene glycol ethyl ether acetate, propylene glycol propyl ether acetate, methyl lactate, ethyl lactate, propyl lactate, sulfolane, propylene glycol dimethyl ether, dipropylene glycol dimethyl ether, ethylene glycol dimethyl ether or diethylene glycol dimethyl ether, gamma-butyrolactone. These solvents may be used alone or in a mixture of two or more.

In one embodiment, the solid component is dissolved in PGMEA (1-methoxy-2-propyl acetate).

other optional additives that are compatible with and can be added to the novel photoresist compositions disclosed and claimed herein include auxiliary resins, plasticizers, surface leveling agents, and stabilizers, as desired, to improve the properties of the resist layer, and the like. The surface leveling agent may include a surfactant. The surfactant is not particularly limited, and examples thereof include polyoxyethylene alkyl ethers such as polyoxyethylene lauryl ether, polyoxyethylene stearyl ether, polyoxyethylene cetyl ether, and polyoxyethylene oleyl (olein) ether; polyoxyethylene alkylaryl ethers such as polyoxyethylene octylphenol ether and polyoxyethylene nonylphenol ether; polyoxyethylene polyoxypropylene block copolymers; sorbitan fatty acid esters such as sorbitan monolaurate, sorbitan monopalmitate (valinate), and sorbitan monostearate; nonionic surfactants of polyoxyethylene sorbitan fatty acid esters such as polyoxyethylene sorbitan monolaurate, polyoxyethylene sorbitan monopalmitate, polyoxyethylene sorbitan monostearate, polyethylene sorbitan trioleate and polyoxyethylene sorbitan tristearate; fluorinated surfactants such as F-Top EF301, EF303 and EF352 (manufactured by Jemco Inc.), MegafacF171, F172, F173, R08, R30, R90 and R94 (manufactured by Dainippon Ink & Chemicals, Inc.), Florad FC-430, FC-431, FC-4430 and FC-4432 (manufactured by Sumitomo 3M Ltd.), Asahi Guard AG710, Surflon S-381, S-382, S-386, SC101, SC102, SC103, SC104, SC105, SC106, Surfinol E1004, KH-10, KH-20, KH-30 and KH-40 (manufactured by Asahi Glass Co., Ltd.); organosiloxane polymers such as KP-341, X-70-092, and X-70-093 (manufactured by Shin-Etsu Chemical Co., Ltd.); and acrylic or methacrylic polymers such as Polyflow No.75 and No.95 (manufactured by Kyoeisha Yushikagaku Kogyo K.K.).

In all of the above embodiments of the photoresist composition of the invention, the total solids component in solvent component f) comprises from about 30 to about 45 percent by weight total solids in the solvent.

In all of the above embodiments of the photoresist composition of the present invention, the composition of the solid components in weight% of the total solid content may be as follows: wherein solid component a) is from about 60 to about 90 wt%; solid component b) from about 0.5 to about 8.0 wt%; solid component c) from about 8.0 to about 30 wt%; solid component d) is from about 0.4 to about 8.0 wt%; and solid component e) from about 0.5 to about 4.0 wt%. In another aspect of this embodiment, the solid component a) can be from about 65 to about 85 weight percent or from about 70 to about 80 weight percent. In another aspect of this embodiment, the solid component b) can be from about 1 to about 7 weight percent or from about 2 to about 6 weight percent or from about 3 to about 5 weight percent. In another aspect of this embodiment, the solid component c) can be from about 10 to about 25 wt%, or from about 12 to about 20 wt%, or from about 13 to about 20 wt%. In another aspect of this embodiment, the solid component d) can be from about 1 to about 7 weight percent, or from about 1 to about 6 weight percent, or from about 1 to about 4 weight percent, or from about 2 to about 3.5 weight percent. In another aspect of this embodiment, the solid component e) can be from about 1 to about 6 wt.%, or from about 1 to about 4 wt.%, or from about 1 to about 3 wt.%, or from about 1 to about 2 wt.%. In all of these aspects of the composition, the sum of the total wt.% of all solid components a), b), c), d) and e) does not exceed 100 wt.%, and equals 100 wt.% if no optional components (e.g., surfactants) as described above are additionally present.

The procedure for preparing a patterned photoresist layer by using the photosensitive composition disclosed herein may be conventional. For example, a substrate such as a semiconductor silicon wafer or LED substrate is uniformly coated with the novel photoresist composition in the form of a solution by using a suitable coater such as a spin coater, followed by baking in a convection oven or on a hot plate to form a photoresist layer, which is then pattern-exposed to actinic radiation such as near ultraviolet rays or visible light emitted from low-pressure, high-pressure and ultrahigh-pressure mercury lamps, arc lamps, or the like via a photomask. The actinic radiation must contain some significant component at about 365nm to minimize the required exposure time. Thereafter, the latent image in the photoresist layer may optionally be baked in a convection oven or on a hot plate, developed using an alkaline developer solution, such as an aqueous solution of: tetra (C1-C4 alkyl) ammonium hydroxide, choline hydroxide, lithium hydroxide, sodium hydroxide, or potassium hydroxide, such as tetramethylammonium hydroxide, at a concentration of 1 to 10% w/w to produce a patterned photoresist layer with good fidelity to the photomask pattern.

Specifically, another aspect of the present invention is a process for imaging the novel photoresist composition described above, which may comprise the steps of:

a1) applying any of the above photoresist compositions to a surface of a suitable substrate to form a photoresist coating;

b1) Heat treating the photoresist coated substrate from step b) until substantially all of the photoresist solvent is removed from the photoresist composition to form a photoresist film;

c1) Imagewise exposing the photoresist film from step c) to imagewise i-radiation to form an irradiated photoresist film containing exposed and unexposed regions;

d1) baking the irradiated resist film after the exposing step c);

e1) Removing the unexposed regions of the irradiated photoresist film from step d1) with a developer to form a substrate covered with an undercut photoresist pattern that undercuts at the resist substrate interface to form a photoresist overhang (overlap).

Another inventive method is a lift-off process for metallization of a patterned photoresist on a substrate, which may include the steps of:

a2) Depositing a metal layer on the substrate covered by the undercut photoresist pattern from step e1) of the above method for imaging the novel photoresist using metal deposition by EBPVD, CVD deposition or sputtering, wherein metal is deposited on the substrate covered by the undercut photoresist pattern. Metal is only deposited in the uncovered substrate in the photoresist pattern in this step, which is not protected by the photoresist film itself or the resist overhang at the substrate interface. Thus, metal deposition occurs elsewhere on the substrate not covered by the remaining photoresist or resist overhang, forming a substrate with selective metal deposition and an undercut photoresist pattern with a metal coating only on top of the photoresist pattern (surface metallization resist pattern) and not in the uncovered substrate in the patterned photoresist protected by the overhang.

b2) Applying a lift-off process to remove the metallized photoresist pattern after step a2) to result in a substrate wherein metallization occurs only in uncovered substrate in the patterned photoresist that is not protected by overhang of undercut patterned photoresist. In this step, the peeling process may be achieved using a chemical peeling agent or using an adhesive tape. If stripping is performed using tape, a further chemical stripping step may be required to remove any residual photoresist.

Detailed Description

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Negative resist formulation for producing undercut pattern profiles

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