阅读说明：本技术 排出流动调节部及包括其的等离子处理装置 (Discharge flow adjustment unit and plasma processing apparatus including the same ) 是由 金亨源 金成旭 蔡熙星 郑熙锡 于 2020-04-13 设计创作，主要内容包括：本发明涉及一种包括排出流动调节部的等离子处理装置,所述排出流动调节部位于作为用等离子对基板进行处理的空间的腔室来调节对所述基板进行处理的等离子的排出流动,其中,所述排出流动调节部为形成有向垂直方向贯通的孔的圆筒形状,且沿周向形成有作为向水平方向贯通由下端向上部隔开的位置的孔的排出部。(The present invention relates to a plasma processing apparatus including an exhaust flow regulating portion that is positioned in a chamber that is a space where a substrate is processed by plasma and regulates an exhaust flow of the plasma for processing the substrate, wherein the exhaust flow regulating portion has a cylindrical shape in which a hole penetrating in a vertical direction is formed, and a hole penetrating in a circumferential direction at a position spaced apart from a lower end to an upper end in a horizontal direction is formed.)

1. A plasma processing apparatus including an exhaust flow regulating portion, characterized by comprising:

a chamber including a formation region that is a region where plasma is formed, a processing region that is a region where a substrate is processed by the plasma, and a discharge region that is a region connected to a pump and from which the plasma that has processed the substrate is discharged;

A chuck located in the processing region for mounting the substrate;

a discharge flow adjustment section which is positioned between the chuck and the formation region and has a cylindrical shape in which a hole penetrating in a vertical direction so as to expose the substrate is formed; and

a guide portion connected to an upper side of the discharge flow regulating portion, having a funnel shape in which a hole penetrating in a vertical direction is formed so as to communicate with the hole penetrating in the vertical direction, and a size of the hole is reduced from an upper side to a lower side so as to guide the plasma formed in the formation region to the processing region,

the discharge flow regulating portion includes:

a plurality of discharge portions each formed in a circumferential direction so as to be symmetrically arranged in a pair of opposing directions, each of the discharge portions being a hole penetrating in a horizontal direction at a position spaced apart from a lower end of the discharge flow adjustment portion by a predetermined distance toward an upper portion; and

a cover portion extending from a lower side of the discharge portion to a lower end of the discharge flow regulating portion to have a first height to block a flow of the plasma,

the discharge unit discharges the plasma in the processing region to the discharge region from a position above the covering unit having the first height.

2. The plasma processing apparatus including the discharge flow regulating portion according to claim 1,

the plurality of discharge portions are arranged at predetermined intervals in a circumferential direction of the discharge flow regulating portion.

3. The plasma processing apparatus including the discharge flow regulating portion according to claim 1,

the discharge portion forms a first flow that is a flow in which the plasma moves from the processing region to the discharge region through the discharge portion.

4. The plasma processing apparatus including the discharge flow adjustment portion according to claim 3, characterized by further comprising:

a first space formed between the discharge flow adjustment part and the chuck and adjusted in height by the elevation of the chuck,

the first pitch forms a second flow that is a flow in which the plasma moves from the processing region to the discharge region through the first pitch.

5. The plasma processing apparatus including the discharge flow adjustment portion according to claim 1, characterized by further comprising:

and a flow control unit having a cylindrical shape in which a hole penetrating in a vertical direction is formed so as to allow the discharge flow adjustment unit to be inserted, and configured to move up and down in conjunction with an elevating mechanism to change a degree of covering the discharge unit, and to wholly or partially open and close a first flow, which is a flow in which the plasma moves from the processing region to the discharge region through the discharge unit, according to the degree of covering the discharge unit changed by the movement.

6. A plasma processing apparatus including an exhaust flow regulating portion, characterized by comprising:

a chamber including a formation region that is a region where plasma is formed, a processing region that is a region where a substrate is processed by the plasma, and a discharge region that is a region connected to a pump and from which the plasma that has processed the substrate is discharged;

a chuck located in the processing region for mounting the substrate;

a discharge flow adjustment section which is positioned between the chuck and the formation region and has a cylindrical shape in which a hole penetrating in a vertical direction so as to expose the substrate is formed;

a plurality of discharge portions which are horizontally penetrating holes formed at positions spaced a predetermined distance from a lower end of the discharge flow adjustment portion to an upper portion thereof and which are formed in a circumferential direction; and

and a flow control unit that moves up and down in a region above the lower end of the discharge flow adjustment unit to change the degree of covering the discharge unit.

7. The plasma processing apparatus including the discharge flow adjustment portion according to claim 6, characterized by further comprising:

and a guide portion having an upper side positioned at a lower portion of the formation region so as to communicate with the formation region, a lower side connected to the discharge flow adjustment portion, and a funnel shape formed with a hole penetrating in a vertical direction so as to communicate with a hole penetrating the discharge flow adjustment portion in the vertical direction, the funnel shape having a size in which the hole is reduced from the upper side to the lower side.

8. The plasma processing apparatus including the discharge flow regulating portion according to claim 1 or 6,

the processing region includes a processing wall having a diameter larger than that of the forming region, and a hole communicating the processing region and the forming region is formed at the center, and is combined with a lower side of the forming region and an upper side of the guide.

9. The plasma processing apparatus including the discharge flow adjustment portion according to claim 8, characterized by further comprising:

and a heater coupled to the processing wall so as to be located around the guide portion.

10. The plasma processing apparatus including the discharge flow adjustment portion according to claim 9, characterized by further comprising:

and a cooling unit coupled to the process wall so as to be located in a periphery spaced apart from the heater, for reducing a temperature transmitted from the heater.

11. The plasma processing apparatus including the discharge flow adjustment portion according to claim 8, characterized by further comprising:

a cover member containing the formation region,

when the cover is unsealed with respect to the processing region in order to clean the inside of the chamber, the cover is unsealed together with the processing wall and the discharge flow regulating portion.

12. A plasma processing method for performing plasma processing using the plasma processing apparatus including the discharge flow adjustment portion according to any one of claims 1 to 11, comprising:

a step a-1 of bringing the chuck close to the discharge flow regulating section at a set pitch;

b-1, treating the substrate by the plasma;

a C-1 step of measuring an etching ratio of an outer side of the substrate processed with the plasma;

and a D-1 step of lowering the chuck so as to be spaced apart from the discharge flow regulating part by a distance greater than a preset pitch when the etching ratio of the outer side of the substrate is lower than a preset reference, and raising and lowering the chuck so as to be spaced apart from the discharge flow regulating part by a distance less than the preset pitch when the etching ratio of the outer side of the substrate is higher than the preset reference.

13. The plasma processing method according to claim 12,

the B-1 step to the D-1 step are repeatedly executed until the etching ratio of the outer side of the substrate is the same as or similar to the set standard.

14. The plasma processing method according to claim 12,

In the step D-1, the etching ratio of the outer side of the substrate is stored in a processing unit, and the processing unit compares the stored etching ratio of the outer side of the substrate with the inputted data to derive a lift value of the chuck, and sends the lift value of the chuck derived by the processing unit to a control unit that controls the lift of the chuck to lift the chuck.

15. The plasma processing method according to claim 12,

the etching ratio of the inner side of the substrate was also measured at the C-1 step,

the set standard in the D-1 step is an etching ratio of the inner side of the substrate.

16. The plasma processing method according to claim 15,

in the D-1 step, the imaging data of the inner side and the outer side of the substrate is stored in a processing unit, and the processing unit compares the outer side and the inner side of the substrate with the stored imaging data or compares the stored imaging data with the inputted data to derive a lift value of the chuck, and sends the lift value of the chuck derived by the processing unit to a control unit that controls the lift of the chuck to lift the chuck.

Technical Field

The present invention relates to an exhaust flow regulating unit and a plasma processing apparatus including the same.

Background

A plasma processing apparatus for processing a substrate S with plasma includes a chamber 100.

The chamber 100 includes a formation region 110 as an inner region where plasma is formed, a processing region 120 as an inner region where the substrate S is processed by plasma, and a discharge region 130 as an inner region where the substrate S is processed by discharging plasma to a pump.

Such plasma forms an exhaust flow that is a flow of plasma moving from the processing region 120 to the exhaust region 130.

At this time, the speed of the discharge flow is faster on the outer side of the substrate S adjacent to the pump than on the inner side of the substrate S.

This makes the plasma process the outer side of the substrate S more than the inner side of the substrate S, so that the Etching ratio (Etching Rate) of the outer side of the substrate S is higher than that of the inner side of the substrate S.

As a result, there is a problem that the etching ratio of the outer side of the substrate S and the etching ratio of the inner side of the substrate S are different.

In particular, when the diameter of the substrate S is large or the processing region 120 is high-pressure, there is a problem in that the etching ratio of the outer side of the substrate S and the etching ratio of the inner side of the substrate S are more different.

Disclosure of Invention

Technical problem

An object of the present invention is to provide an exhaust flow regulating portion and a plasma processing apparatus including the same.

Technical scheme

The discharge flow regulating part of the embodiment of the present invention is a cylindrical discharge flow regulating part having a hole penetrating in a vertical direction and having a hole penetrating in a circumferential direction at a position spaced apart from a lower end to an upper portion in a horizontal direction, the discharge flow regulating part being located in a chamber which is a space where a substrate is processed by plasma and regulating a discharge flow of the plasma processing the substrate.

Preferably, the discharge flow regulating portion of the embodiment of the present invention is characterized in that a plurality of the discharge portions are formed along a circumferential direction of the discharge flow regulating portion, and the plurality of the discharge portions are arranged at a predetermined interval from each other along the circumferential direction of the discharge flow regulating portion.

Preferably, the discharge flow adjustment portion according to an embodiment of the present invention is characterized in that a plurality of the discharge portions are formed along a circumferential direction of the discharge flow adjustment portion, and the plurality of the discharge portions are arranged in a pair of opposing symmetrical directions.

Preferably, the discharge flow regulating portion of an embodiment of the present invention is characterized in that a first height, which is a height of a lower end of the discharge flow regulating portion up to a position where the discharge portion is formed, is greater than a height of the discharge portion.

Preferably, the discharge flow regulating portion according to an embodiment of the present invention is characterized in that a guide portion is connected to one side of the discharge flow regulating portion, the guide portion is formed in a funnel shape in which a hole penetrating in a vertical direction is formed so as to communicate with a hole penetrating in the vertical direction, and a size of the hole is reduced from an upper side to a lower side.

The discharge flow regulating portion of the embodiment of the present invention includes: a chamber including a formation region that is a region where plasma is formed, a processing region that is a region where a substrate is processed by the plasma, and a discharge region that is a region connected to a pump and from which the plasma that has processed the substrate is discharged; a chuck located in the processing region for mounting the substrate; a discharge flow adjustment section which is positioned between the chuck and the formation region and has a cylindrical shape in which a hole penetrating in a vertical direction so as to expose the substrate is formed; and a guide portion connected to an upper side of the discharge flow adjustment portion, and having a funnel shape in which a hole penetrating in a vertical direction is formed so as to communicate with the hole penetrating in the vertical direction through the discharge flow adjustment portion, and a size of the hole is reduced from an upper side to a lower side so as to guide plasma formed in the formation region to the processing region, the discharge flow adjustment portion including: a plurality of discharge portions each formed in a circumferential direction so as to be symmetrically arranged in a pair of opposing directions, each of the discharge portions being a hole penetrating in a horizontal direction at a position spaced apart from a lower end of the discharge flow adjustment portion by a predetermined distance toward an upper portion; and a covering part extending from a lower side of the discharge part to a lower end of the discharge flow regulating part to have a first height to block a flow of the plasma, the discharge part discharging the plasma of the processing region to the discharge region from a position above the covering part having the first height.

Preferably, the discharge flow regulating portion of an embodiment of the present invention is characterized in that a plurality of the discharge portions are arranged at a predetermined interval from each other in a circumferential direction of the discharge flow regulating portion.

A plasma processing apparatus including a discharge flow regulating section according to an embodiment of the present invention includes: a chamber including a formation region that is a region where plasma is formed, a processing region that is a region where a substrate is processed by the plasma, and a discharge region that is a region connected to a pump and from which the plasma that has processed the substrate is discharged; a chuck located in the processing region for mounting the substrate; a discharge flow adjustment section which is positioned between the chuck and the formation region and has a cylindrical shape in which a hole penetrating in a vertical direction so as to expose the substrate is formed; a plurality of discharge portions which are horizontally penetrating holes formed at positions spaced a predetermined distance from a lower end of the discharge flow adjustment portion to an upper portion thereof and which are formed in a circumferential direction; and a flow control unit that moves up and down in a region above the lower end of the discharge flow adjustment unit to change the degree of covering the discharge unit.

A plasma processing apparatus including a discharge flow regulating section according to an embodiment of the present invention includes: a chamber including a formation region that is a region where plasma is formed, a processing region that is a region where a substrate is processed by the plasma, and a discharge region that is a region connected to a pump and from which the plasma that has processed the substrate is discharged; a chuck located in the processing region for mounting the substrate; and a discharge flow regulating section which is located between the chuck and the formation region, has a cylindrical shape in which a hole penetrating in a vertical direction so as to expose the substrate is formed, and has a discharge section in which a hole penetrating in a circumferential direction is formed as a position spaced apart from a lower end toward an upper portion in a horizontal direction.

Preferably, the plasma processing apparatus including the discharge flow regulating portion according to an embodiment of the present invention is characterized in that a plurality of the discharge portions are formed along a circumferential direction of the discharge flow regulating portion, and the plurality of the discharge portions are arranged in a pair of opposing symmetrical manners.

Preferably, a plasma processing apparatus including a discharge flow regulating portion according to an embodiment of the present invention is characterized in that a first height as a height from a lower end of the discharge flow regulating portion to a position before a position where the discharge portion is formed is larger than a height of the discharge portion.

Preferably, the plasma processing apparatus including the discharge flow regulating portion of the embodiment of the present invention further includes: and a guide portion having an upper side positioned at a lower portion of the formation region so as to communicate with the formation region, a lower side connected to the discharge flow adjustment portion, and a funnel shape formed with a hole penetrating in a vertical direction so as to communicate with a hole penetrating the discharge flow adjustment portion in the vertical direction, the funnel shape having a size in which the hole is reduced from the upper side to the lower side.

Preferably, a plasma processing apparatus including an exhaust flow regulating portion according to an embodiment of the present invention is characterized in that the exhaust portion forms a first flow as a flow in which the plasma moves from the processing region to the exhaust region through the exhaust portion.

Preferably, a plasma processing apparatus including the discharge flow regulating portion according to an embodiment of the present invention is characterized by further including: and a first gap formed between the discharge flow adjustment part and the chuck, the height of which is adjusted by raising and lowering the chuck, the first gap forming a second flow which is a flow in which the plasma moves from the processing region to the discharge region through the first gap.

Preferably, the plasma processing apparatus including the discharge flow regulating portion of the embodiment of the present invention further includes: and a flow control unit having a cylindrical shape in which a hole penetrating in a vertical direction is formed so as to allow the discharge flow adjustment unit to be inserted, and configured to move up and down in conjunction with an elevating mechanism to change a degree of covering the discharge unit, and to wholly or partially open and close a first flow, which is a flow in which the plasma moves from the processing region to the discharge region through the discharge unit, according to the degree of covering the discharge unit changed by the movement up and down.

Preferably, the processing region includes a processing wall having a diameter greater than that of the forming region, and a hole communicating the processing region and the forming region is formed at the center to be combined with a lower side of the forming region and an upper side of the guide.

Preferably, the plasma processing apparatus including the discharge flow regulating portion of the embodiment of the present invention further includes: and a heater coupled to the processing wall so as to be located around the guide portion.

Preferably, the plasma processing apparatus including the discharge flow regulating portion of the embodiment of the present invention further includes: and a cooling unit coupled to the process wall so as to be located in a periphery spaced apart from the heater, for reducing a temperature transmitted from the heater.

Preferably, the plasma processing apparatus including the discharge flow regulating portion of the embodiment of the present invention further includes: and a cover member including the formation region, wherein when the cover member is unsealed with respect to the processing region to clean the inside of the chamber, the cover member is unsealed together with the processing wall and the discharge flow regulating portion.

A plasma processing apparatus including a discharge flow adjustment portion according to an embodiment of the present invention includes: a chamber including a formation region that is a region where plasma is formed, a processing region that is a region where a substrate is processed by the plasma, and a discharge region that is a region connected to a pump and from which the plasma that has processed the substrate is discharged; a chuck located in the processing region for mounting the substrate; a discharge flow adjustment section which is positioned between the chuck and the formation region and has a cylindrical shape in which a hole penetrating in a vertical direction so as to expose the substrate is formed; and a first gap formed between the discharge flow adjustment part and the chuck, and having a height adjusted by ascending and descending the chuck or by being interlocked with an ascending and descending mechanism, wherein the first gap forms a second flow which is a flow in which the plasma moves from the processing region to the discharge region through the first gap.

The process steps of the plasma processing device of the embodiment of the invention comprise: a step A-1 of making the chuck approach the discharge flow regulating part at a preset interval; b-1, processing the substrate by plasma; a C-1 step of measuring an etching ratio of the outer side of the substrate processed with the plasma; and a D-1 step of lowering the chuck so as to be spaced apart from the discharge flow regulating part by a distance greater than a preset pitch when the etching ratio of the outer side of the substrate is lower than a preset reference, and raising and lowering the chuck so as to be spaced apart from the discharge flow regulating part by a distance less than the preset pitch when the etching ratio of the outer side of the substrate is higher than the preset reference.

Preferably, the process steps of the plasma processing apparatus according to an embodiment of the present invention are characterized in that the B-1 step to the D-1 step are repeatedly performed until the etching ratio of the outer side of the substrate is the same as or similar to a set reference.

Preferably, in the D-1 step, the process step of the plasma processing apparatus according to an embodiment of the present invention is characterized in that the etching ratio of the outer side of the substrate is stored in a processing unit, the processing unit compares the stored etching ratio of the outer side of the substrate with inputted data to derive a lift value of the chuck, and the lift value of the chuck derived by the processing unit is transmitted to a control unit which controls the lift of the chuck to raise and lower the chuck.

Preferably, the process steps of the plasma processing apparatus according to the embodiment of the present invention are characterized in that the etching ratio of the inner side of the substrate is also measured in the C-1 step, and the set reference in the D-1 step is the etching ratio of the inner side of the substrate.

Preferably, in the D-1 step, the process steps of the plasma processing apparatus according to an embodiment of the present invention include storing the imaging data of the inner side and the outer side of the substrate in a processing unit, and the processing unit compares the outer side and the inner side of the substrate with the stored imaging data or compares the external side and the inner side with the inputted data to derive the lift value of the chuck, and sends the lift value of the chuck derived by the processing unit to a control unit that controls the lift of the chuck to lift the chuck.

ADVANTAGEOUS EFFECTS OF INVENTION

Since the rate of the discharge flow outside the substrate S is decreased to lower the etching ratio outside the substrate S, the difference in etching ratio between the inside and the outside of the substrate S is reduced.

Drawings

Fig. 1 is a perspective view of a discharge flow regulating part of an embodiment of the present invention.

Fig. 2 is a front view of a discharge flow regulating portion of the embodiment of the present invention.

Fig. 3 to 7 are sectional views of a plasma processing apparatus according to an embodiment of the present invention.

Description of the symbols

100: chamber, 110: formation region, 120: treatment area, 130: discharge area, 200: discharge flow adjustment portion, 210: discharge unit, 220: a cover, 300: guide portion, 400: treatment wall, 500: heater, 600: cooling unit, 700: a cover, 800: flow control unit, C: chuck, F1: first flow, F2: second flow, G1: first pitch, H1: first height, H2: second height, S: a substrate.

Detailed Description

A plasma processing apparatus for processing a substrate S with plasma includes a chamber 100.

The chamber 100 includes a formation region 110 as an inner region where plasma is formed, a processing region 120 as an inner region where the substrate S is processed by the plasma, and a discharge region 130 as an inner region where the plasma processed on the substrate S is discharged to a pump.

Such plasma forms an exhaust flow that is a flow of plasma moving from the processing region 120 to the exhaust region 130.

At this time, the speed of the discharge flow is faster on the outer side of the substrate S adjacent to the pump than on the inner side of the substrate S.

This makes the plasma process the outer side of the substrate S more than the inner side of the substrate S, so that the Etching ratio (Etching Rate) of the outer side of the substrate S is higher than that of the inner side of the substrate S.

As a result, there is a problem that the etching ratio of the outer side of the substrate S and the etching ratio of the inner side of the substrate S are different.

In particular, when the diameter of the substrate S is large or the processing region 120 is high-pressure, there is a problem in that the etching ratio of the outer side of the substrate S and the etching ratio of the inner side of the substrate S are more different.

In order to solve such a problem, as illustrated in fig. 1 and 2, the discharge flow regulating portion 200 of the embodiment of the present invention includes the following features.

A discharge flow regulating part 200 is positioned in a chamber 100 which is a space for processing a substrate S by plasma and regulates a discharge flow of the plasma for processing the substrate S, wherein the discharge flow regulating part 200 is formed in a cylindrical shape in which a hole penetrating in a vertical direction is formed, a discharge part 210 which is a hole penetrating in a horizontal direction at a position spaced apart from a lower end to an upper end is formed in a circumferential direction, and a covering part 220 which extends from a lower side of the discharge part 210 to a lower end of the discharge flow regulating part 200 in order to block the flow of the plasma and has a first height H1 is formed.

At this time, the discharge flow regulating portion 200 may include one or more of the following features 1 to 4.

The method is characterized in that: a plurality of the discharge portions 210 may be formed along the circumferential direction of the discharge flow adjustment portion 200, and the plurality of discharge portions 210 may be arranged in a pair of opposing symmetrical ways.

And (2) feature: the first height H1, which is the height of the lower end of the discharge flow regulating portion 200 up to the position where the discharge portion 210 is formed, may be greater than the height of the discharge portion 210.

That is, the covering part 220 having the first height H1 may be greater than the height of the discharge part 210.

Without being limited thereto, the first height H1 may be less than or equal to the height of the discharge portion 210.

And (3) feature: the second height H2, which is the height from the upper end of the discharge flow regulating part 200 to the discharge part 210, may be less than the first height H1.

And (4) feature: the first height H1 may be 50% or less of the diameter of the substrate S.

From this, it was confirmed through repeated experiments that when the first height H1 is 50% or less of the diameter of the substrate S, the difference between the etching ratio on the outer side of the substrate S and the etching ratio on the inner side of the substrate S is reduced (i.e., the effect of improving the etching uniformity).

In particular, it was confirmed that the etching uniformity of the substrate S was very good when the first height H1 was 10% to 30% of the diameter of the substrate S.

For example, when the diameter of the substrate S belongs to the case of reference 1 to reference 4, the first height H1 may be as follows.

Reference 1: the first height H1 is 10mm to 30mm when the diameter of the substrate S is 100 mm;

reference 2: when the diameter of the substrate S is 150mm, the first height H1 is 15mm to 45 mm;

Reference 3: the first height H1 is 20mm to 60mm when the diameter of the substrate S is 200 mm;

reference 4: when the diameter of the substrate S is 300mm, the first height H1 is 30mm to 90 mm.

As illustrated in fig. 1 and 2, the discharge flow regulating portion 200 of the embodiment of the present invention includes the following features.

A hole penetrating in the vertical direction is formed in the discharge flow adjustment portion 200 so as to communicate with the hole penetrating in the vertical direction, and a funnel-shaped guide portion 300 in which the size of the hole is reduced from the upper side toward the lower side is connected to one side of the discharge flow adjustment portion 200.

The discharge flow control section 200 is explained above as a reference, and the plasma processing apparatus is explained below as a reference.

As illustrated in fig. 3, the plasma processing apparatus including the exhaust flow regulating part 200 of the embodiment of the present invention includes a chamber 100, a chuck C, and the exhaust flow regulating part 200.

The chamber 100 includes a formation region 110 that is a region where plasma is formed, a processing region 120 that is a region where the substrate S is processed by the plasma, and a discharge region 130 that is a region connected to a pump (pump) and from which the plasma that has processed the substrate S is discharged.

The chuck C is located in the processing region 120 for mounting the substrate S.

The discharge flow regulating part 200 is positioned between the chuck C and the formation region 110, has a cylindrical shape in which a hole penetrating in a vertical direction so as to expose the substrate S is formed, has a discharge part 210 formed in a circumferential direction as a hole penetrating in a horizontal direction at a position spaced apart from a lower end to an upper end, and has a covering part 220 extending from a lower side of the discharge part 210 to a lower end of the discharge flow regulating part 200 so as to block a flow of plasma and having a first height H1.

At this time, the discharge flow regulating portion 200 may include one or more of the following features 1 to 4.

The method is characterized in that: a plurality of the discharge portions 210 may be formed along the circumferential direction of the discharge flow adjustment portion 200, and the plurality of discharge portions 210 may be arranged in a pair of opposing symmetrical ways.

And (2) feature: the first height H1, which is the height of the lower end of the discharge flow regulating portion 200 up to the position where the discharge portion 210 is formed, may be greater than the height of the discharge portion 210.

That is, the covering part 220 having the first height H1 may be greater than the height of the discharge part 210.

Without being limited thereto, the first height H1 may be less than or equal to the height of the discharge portion 210.

And (3) feature: the second height H2, which is a height from the upper end of the discharge flow regulating part 200 to before the discharge part 210, may be less than the first height H1.

And (4) feature: the first height H1 may be 50% or less of the diameter of the substrate S.

From this, it was confirmed through repeated experiments that when the first height H1 is 50% or less of the diameter of the substrate S, the difference between the etching ratio on the outer side of the substrate S and the etching ratio on the inner side of the substrate S is reduced (i.e., the effect of improving the etching uniformity).

In particular, it was confirmed that the etching uniformity of the substrate S was very good when the first height H1 was 10% to 30% of the diameter of the substrate S.

For example, when the diameter of the substrate S belongs to the case of reference 1 to reference 4, the first height H1 may be as follows.

Reference 1: the first height H1 is 10mm to 30mm when the diameter of the substrate S is 100 mm;

reference 2: when the diameter of the substrate S is 150mm, the first height H1 is 15mm to 45 mm;

reference 3: the first height H1 is 20mm to 60mm when the diameter of the substrate S is 200 mm;

reference 4: when the diameter of the substrate S is 300mm, the first height H1 is 30mm to 90 mm.

As illustrated in fig. 3, the plasma processing apparatus including the discharge flow regulating part 200 of the embodiment of the present invention includes a funnel-shaped guide part 300.

The upper side of the guide 300 is located at the lower portion of the formation region 110 in such a manner as to communicate with the formation region 110, and the lower side of the guide 300 is connected to the discharge flow regulating part 200.

The guide portion 300 is formed with a hole penetrating in the vertical direction so as to communicate with a hole penetrating the discharge flow adjustment portion 200 in the vertical direction, and the size of the hole formed in the guide portion 300 is reduced from the upper side toward the lower side.

As illustrated in fig. 4, the plasma processing apparatus including the discharge flow regulating portion 200 of the embodiment of the present invention includes the following features.

The exhaust 210 forms a first flow F1 that is a flow of plasma from the processing region 120 through the exhaust 210 to the exhaust region 130.

The discharge portion 210 is formed at a first height H1 from one end of the discharge flow regulator 200, and the discharge portion 210 is positioned above the substrate S.

Accordingly, since the plasma is not immediately discharged to the discharge region 130 at the outer side of the substrate S, the discharge flow velocity of the outer side of the substrate S is reduced.

In this way, since the speed of the discharge flow outside the substrate S is reduced, the etching ratio outside the substrate S is lowered, and thus the difference in etching ratio between the inside and the outside of the substrate S is reduced.

The etching ratio of the outer side of the substrate S is affected by the change in the velocity of the discharge flow of the first flow F1 corresponding to the height of the discharge portion 210.

The influence of the etching ratio on the outer side is due to the change in the speed of the first flow F1, and as examples for adjusting the speed of the first flow F1, a first example in which the speed of the first flow F1 is adjusted by forming another flow than the first flow F1 and a second example in which the speed of the first flow F1 is adjusted by the flow control unit 800 of the open/close discharge unit 210 will be described later.

First, a first embodiment of adjusting the amount of the first flow F1 will be explained.

As illustrated in fig. 4, the plasma processing apparatus including the discharge flow regulating part 200 of the embodiment of the present invention further includes a first gap G1.

A first gap G1 is formed between the discharge flow regulating part 200 and the cartridge C.

That is, the first gap G1 is formed between the covering part 220 and the chuck C.

Along with the first interval G1, the height of the first interval G1 may be adjusted by the elevation and lowering of the chuck C as illustrated in fig. 3, or the height of the first interval G1 may be adjusted in conjunction with the elevation mechanism as illustrated in fig. 7.

At this time, the first gap G1 forms the second flow F2 as a flow in which the plasma moves from the processing region 120 to the discharge region 130 through the first gap G1, and the speed of the second flow F2 is adjusted according to the height of the first gap G1.

That is, as the height of the first pitch G1 becomes higher, the speed of the second flow F2 becomes faster, and as the height of the first pitch G1 becomes lower, the speed of the second flow F2 becomes slower.

A second embodiment of adjusting the amount of the first flow F1 is explained below.

As illustrated in fig. 6, the plasma processing apparatus including the discharge flow regulating part 200 of the embodiment of the present invention includes a flow control part 800.

The flow control portion 800 has a cylindrical shape in which a hole penetrating in the vertical direction is formed so as to insert the discharge flow adjustment portion 200.

The flow control unit 800 moves up and down in conjunction with the lift mechanism to change the degree of covering the discharge unit 210, and wholly or partially opens and closes the first flow F1, which is the flow of the plasma moving from the processing region 120 to the discharge region 130 through the discharge unit 210, according to the degree of covering the discharge unit 210 changed by the moving up and down.

As another embodiment different from the foregoing embodiment for adjusting the speed of the first flow F1, the outside etching ratio may also be adjusted only by the second flow F2 instead of the first flow F1.

As illustrated in fig. 7, the plasma processing apparatus including the discharge flow regulating part 200 of the embodiment of the present invention further includes a first gap G1.

A first gap G1 is formed between the discharge flow regulating part 200 and the cartridge C.

With respect to the first spacing G1, as illustrated in fig. 7, the height of the first spacing G1 may be adjusted in conjunction with the lifting mechanism.

Alternatively, in the case of the first gap G1, as illustrated in fig. 3, the height of the first gap G1 may be adjusted by the elevation and the depression of the chuck C.

At this time, the first gap G1 forms the second flow F2 as a flow in which the plasma moves from the processing region 120 to the discharge region 130 through the first gap G1, and the speed of the second flow F2 is adjusted according to the height of the first gap G1.

That is, as the height of the first pitch G1 becomes higher, the speed of the second flow F2 becomes faster, and as the height of the first pitch G1 becomes lower, the speed of the second flow F2 becomes slower.

As illustrated in fig. 3, the process region 120 of the plasma processing apparatus including the exhaust flow regulating part 200 of the embodiment of the present invention includes a process wall 400.

The processing wall 400 has a diameter larger than that of the formation region 110, a hole communicating the processing region 120 and the formation region 110 is formed at the center, and the lower side of the formation region 110 and the upper side of the guide 300 are coupled to the processing wall 400.

At this time, when the guide part 300 is not connected to the upper side of the discharge flow regulating part 200, the upper side of the discharge flow regulating part 200 may be directly or indirectly coupled to the process wall 400.

As illustrated in fig. 3, the plasma processing apparatus including the discharge flow regulating part 200 of the embodiment of the present invention includes a heater 500.

The heater 500 is coupled to the process wall 400 so as to be positioned around the guide 300.

In this case, the heater 500 may be a heating element that generates heat by electricity or a pipe member that generates heat by circulating a fluid of a higher temperature inside.

The heater 500 prevents foreign substances (i.e., process by-products generated by processing the substrate S with plasma) from adhering to the discharge flow regulating part 200 and the guide part 300 by raising the temperature of the discharge flow regulating part 200 and the guide part 300, thereby increasing a cleaning cycle due to contamination.

As illustrated in fig. 3, the plasma processing apparatus including the plasma processing apparatus discharge flow adjustment part 200 according to the embodiment of the present invention includes a cooling part 600 that reduces the temperature.

The cooling part 600 is coupled to the process wall 400 to be located at a periphery spaced apart from the heater 500, and reduces the temperature transmitted from the heater 500.

At this time, the cooling part 600 circulates a fluid having a temperature lower than that of the heater 500 inside, so that the cooling part 600 can block or reduce heat conducted from the heater 500 to the outside of the process wall 400.

In this way, the cooling part 600 reduces the high temperature transmitted to the outside by the heater 500, thereby having an effect of preventing the high temperature of the heater 500 from being transmitted to the outside to expose the user to danger.

As illustrated in fig. 5, the plasma processing apparatus including the discharge flow regulating part 200 of the embodiment of the present invention further includes a cover 700.

The cover member 700 includes the formation region 110 therein.

When the cover member 700 is unsealed with respect to the processing region 120 in order to clean the inside of the chamber 100, the cover member 700 is unsealed together with the processing wall 400 and the discharge flow regulating part 200.

The process steps of the plasma processing apparatus of the embodiment of the present invention include a-1 step, a B-1 step, a C-1 step, and a D-1 step.

In the step a-1, the chucks C are brought close to the discharge flow regulating portion 200 at a set interval.

In step B-1, the substrate S is treated with plasma.

In the step C-1, the etching ratio of the outer side of the substrate S after the plasma treatment was measured.

In the step D-1, when the etching ratio of the outer side of the substrate S is lower than the set reference, the chuck C is lowered to be spaced apart from the discharge flow regulating part 200 by a distance greater than the set pitch; when the etching ratio of the outer side of the substrate S is higher than the set reference, the chuck C is raised and lowered so as to be spaced apart from the discharge flow regulating part 200 by a distance smaller than the set pitch.

At this time, the B-1 to D-1 steps may be repeatedly performed until the etching ratio to the outer side of the substrate S is the same as or similar to the set reference.

In the step D-1, the etching ratio of the outer side of the substrate S may be stored in the processing unit, and the processing unit may compare the stored etching ratio of the outer side of the substrate S with the inputted data to derive the elevation value of the chuck C, and may transmit the elevation value of the chuck C derived by the processing unit to the control unit that controls the elevation of the chuck C to elevate the chuck C.

Further, in the C-1 step, the etching ratio of the inner side of the substrate S may be measured, and the reference set in the D-1 step may be the etching ratio of the inner side of the substrate S.

In the step D-1, the processing unit may store the imaging data of the inner side and the outer side of the substrate S in the processing unit, compare the outer side and the inner side of the substrate S with the stored imaging data or compare the data with the inputted data to derive the elevation value of the chuck C, and send the elevation value of the chuck C derived by the processing unit to the control unit controlling the elevation of the chuck C to elevate the chuck C.

The plasma is formed by a reaction between the process gas flowing into the chamber 100 and the high frequency electric field.

Therefore, the plasma may mean the plasma formed by the reaction of the process gas and the process gas in the formation region 110, the process region 120, and the exhaust region 130.

Further, it is meant to include process by-products resulting from plasma processing of the substrate S in the processing region 120 and the exhaust region 130.