阅读说明：本技术 一种扩散工艺中的自动扩散装置及其使用方法 (Automatic diffusion device in diffusion process and use method thereof ) 是由 李明 岳爱文 胡艳 钟行 李晶 于 2021-08-05 设计创作，主要内容包括：本发明涉及半导体闭管扩散技术领域,特别是涉及一种扩散工艺中的自动扩散装置及其使用方法,包括,PLC控制台、推拉机构、冷却风干机构和扩散炉；所述PLC控制台与所述推拉机构、冷却风干机构和扩散炉电连接；所述推拉机构,根据PLC控制台的指令将所述推拉机构装载的封闭真空石英管送入或者送出扩散炉；所述冷却风干机构,根据PLC控制台的指令对所述推拉机构装载的封闭真空石英进行冷却和风干；所述扩散炉,根据PLC控制台的指令对扩散炉进行加热；整个工艺过程几乎完全是自动控制,操作简单,极大程度上避免了人为操作失误发生危险的可能,且自动计时的时间精确度极高保证,对每次冷却时间和冷却位置可以根据现场动态情况实时自动判断并得到精确控制,这样可以优化外延片扩散的均一性和一致性。(The invention relates to the technical field of semiconductor closed tube diffusion, in particular to an automatic diffusion device in a diffusion process and a using method thereof, wherein the automatic diffusion device comprises a PLC (programmable logic controller) console, a push-pull mechanism, a cooling and air-drying mechanism and a diffusion furnace; the PLC console is electrically connected with the push-pull mechanism, the cooling and air-drying mechanism and the diffusion furnace; the push-pull mechanism sends the closed vacuum quartz tube loaded by the push-pull mechanism into or out of the diffusion furnace according to the instruction of the PLC console; the cooling and air-drying mechanism cools and air-dries the closed vacuum quartz loaded by the push-pull mechanism according to the instruction of the PLC console; the diffusion furnace is heated according to the instruction of the PLC console; the whole process is almost completely automatically controlled, the operation is simple, the possibility of danger caused by manual operation errors is avoided to the greatest extent, the time accuracy of automatic timing is extremely high, the cooling time and the cooling position at each time can be automatically judged in real time according to the dynamic situation on site and accurately controlled, and therefore the uniformity and consistency of epitaxial wafer diffusion can be optimized.)

1. An automated diffusion apparatus in a diffusion process, the automated diffusion apparatus comprising: a PLC console (1), a push-pull mechanism (2), a cooling and air-drying mechanism (3) and a diffusion furnace (4);

the PLC console (1) is electrically connected with the push-pull mechanism (2), the cooling and air-drying mechanism (3) and the diffusion furnace (4);

the push-pull mechanism (2) is used for sending the closed vacuum quartz tube (25) loaded by the push-pull mechanism (2) into or out of the diffusion furnace (4) according to the instruction of the PLC console (1);

the cooling and air-drying mechanism (3) cools and air-dries the closed vacuum quartz tube (25) loaded by the push-pull mechanism (2) according to the instruction of the PLC console (1);

the diffusion furnace (4) heats the diffusion furnace (4) according to the instruction of the PLC console (1);

and in the initial state, the cooling and air-drying mechanism (3) is positioned between the push-pull mechanism (2) and the diffusion furnace (4).

2. The automatic diffusion device in the diffusion process according to claim 1, wherein the push-pull mechanism (2) comprises a motor (21), a guide rail (22), an L-shaped quartz rod (23) and an object stage (24);

the motor (21) is connected with the guide rail (22), one end of the L-shaped quartz rod (23) is connected with the guide rail (22), the other end of the L-shaped quartz rod (23) is connected with the objective table (24), and the objective table (24) is used for bearing a closed vacuum quartz tube (25);

the motor (21) is used for driving the guide rail (22) to rotate, so that the L-shaped quartz rod (23) is driven to be sent into or out of the diffusion furnace (4).

3. The automatic diffusion device in a diffusion process according to claim 1, characterized in that said cooling seasoning mechanism (3) comprises a first cooling seasoning device (31) and a second seasoning device (32);

in the initial state, the secondary air drying device (32) is positioned between the first cooling air drying device (31) and the push-pull mechanism (2).

4. The automatic diffusion apparatus in a diffusion process according to claim 3, wherein the first cooling and airing means (31) comprises a fixed disk (311), a water-cooled tube (312) and a driving mechanism (313);

the fixed plate (311) comprises an arc-shaped hole (3111), and the water cooling pipe (312) penetrates through the arc-shaped hole (3111);

the driving mechanism (313) is connected with the fixed disc (311), and the water cooling pipe (312) is connected with the driving mechanism (313), so that the driving mechanism (313) drives the water cooling pipe (312) to move along the arc path of the arc-shaped hole (3111) or along the opening width direction of the arc-shaped hole (3111).

5. The automatic diffusion device in diffusion process according to claim 4, characterized in that said first cooling and air drying device (31) further comprises an air drying pipe (314), said air drying pipe (314) being connected with said fixed disk (311) for air drying the closed vacuum quartz tube (25) sent out of the diffusion furnace (4).

6. The automatic diffusion apparatus in a diffusion process according to claim 1, wherein said diffusion furnace (4) comprises a heating furnace body (41) and a quartz inner tube (42), said quartz inner tube (42) being located inside said heating furnace body (41).

7. The automatic diffusion apparatus in a diffusion process according to claim 6, wherein the diffusion furnace (4) further comprises a temperature sensor (43), the temperature sensor (43) is located inside the quartz inner tube (42) for detecting the temperature in the diffusion furnace (4) in real time and uploading the temperature detected in real time to the PLC console (1).

8. The automatic diffusion device in the diffusion process according to claim 6, further comprising a gas control mechanism (5), wherein the gas control mechanism (5) is electrically connected with the PLC console (1), and the gas control mechanism (5) is mechanically connected with the quartz inner tube (42) and is used for injecting inert gas into the quartz inner tube (42) so as to ensure that the pressure of the quartz inner tube (42) is positive pressure.

9. The automatic diffusion device in the diffusion process according to any one of claims 1 to 8, further comprising a camera (6), wherein the camera (6) is electrically connected with the PLC console (1), and the camera (6) is used for acquiring appearance information of the closed vacuum quartz tube (25) loaded by the push-pull mechanism (2) and transmitting the appearance information to the PLC console (1).

10. The use method of the automatic diffusion device in the diffusion process is characterized in that each process parameter is input into the PLC console (1), so that the PLC console (1) sends an instruction according to the process parameter;

the diffusion furnace (4) raises the temperature in the diffusion furnace (4) to a preset threshold value according to the instruction of the PLC console (1);

the push-pull mechanism (2) sends the closed vacuum quartz tube (25) loaded by the push-pull mechanism (2) into the diffusion furnace (4) for heating according to the instruction of the PLC console (1);

the push-pull mechanism (2) sends the closed vacuum quartz tube (25) loaded by the push-pull mechanism (2) out of the diffusion furnace (4) according to the instruction of the PLC console (1);

and the cooling and air-drying mechanism (3) cools and air-dries the closed vacuum quartz tube (25) sent out of the diffusion furnace (4) according to the instruction of the PLC console (1).

[ technical field ] A method for producing a semiconductor device

The invention relates to the technical field of semiconductor closed tube diffusion, in particular to an automatic diffusion device in a diffusion process and a using method thereof.

[ background of the invention ]

The diffusion process is one of the very important processes in the semiconductor manufacturing process, and the conventional indium gallium arsenic epitaxial wafer is formed by an organic-organic Chemical Vapor Deposition (MOCVD) technology, and an indium gallium arsenic absorption layer and an intrinsic indium phosphide top layer are grown on a base material through various doping in the process of manufacturing the conventional indium gallium arsenic epitaxial wafer, so that a P-type diffusion region is formed.

In the diffusion process, the uniformity and consistency of diffusion of an epitaxial wafer are important parameter indexes of the diffusion process, the traditional closed tube diffusion process is to place the epitaxial wafer and a diffusion source into a quartz tube, seal the quartz tube by using hydrogen-oxygen flame after vacuumizing, manually place the sealed quartz tube into a heated furnace body for diffusion, manually time, manually pull out and cool after the process diffusion time is reached, the whole process is almost completely manually controlled, the operation is complex, the possibility of danger caused by manual operation errors is easy to generate, the time accuracy of manual time timing cannot be guaranteed, the cooling time and the cooling area cannot be accurately controlled every time, and the uniformity and consistency of diffusion of the epitaxial wafer are greatly influenced.

In view of the above, overcoming the drawbacks of the prior art is an urgent problem in the art.

[ summary of the invention ]

The technical problems to be solved by the invention are as follows:

the traditional closed tube diffusion process is characterized in that an epitaxial wafer and a diffusion source are placed in a quartz tube, the quartz tube is sealed by hydrogen-oxygen flame after vacuumizing to form a sealed vacuum quartz tube, the sealed quartz tube is manually placed in a heated diffusion furnace to be heated and diffused, manual timing is carried out, and after the process diffusion time is reached, the sealed vacuum quartz tube is manually pulled out and cooled.

The invention achieves the above purpose by the following technical scheme:

in a first aspect, the present invention provides an automatic diffusion apparatus in a diffusion process, the automatic diffusion apparatus comprising: the device comprises a PLC console 1, a push-pull mechanism 2, a cooling and air-drying mechanism 3 and a diffusion furnace 4;

the PLC console 1 is electrically connected with the push-pull mechanism 2, the cooling and air-drying mechanism 3 and the diffusion furnace 4;

the push-pull mechanism 2 sends the closed vacuum quartz tube 25 loaded by the push-pull mechanism 2 into or out of the diffusion furnace 4 according to the instruction of the PLC console 1;

the cooling and air-drying mechanism 3 cools and air-dries the closed vacuum quartz tube 25 loaded by the push-pull mechanism 2 according to the instruction of the PLC console 1;

the diffusion furnace 4 heats the diffusion furnace 4 according to the instruction of the PLC console 1;

wherein, in the initial state, the cooling and air-drying mechanism 3 is positioned between the push-pull mechanism 2 and the diffusion furnace 4.

Preferably, the push-pull mechanism 2 comprises a motor 21, a guide rail 22, an L-shaped quartz rod 23 and an object stage 24;

the motor 21 is connected with the guide rail 22, one end of the L-shaped quartz rod 23 is connected with the guide rail 22, the other end of the L-shaped quartz rod 23 is connected with the object stage 24, and the object stage 24 is used for bearing a closed vacuum quartz tube 25;

the motor 21 is used for driving the guide rail 22 to rotate, so as to drive the L-shaped quartz rod 23 to be sent into or out of the diffusion furnace 4.

Preferably, the cooling and air-drying mechanism 3 comprises a first cooling and air-drying device 31 and a second cooling and air-drying device 32;

in the initial state, the secondary air drying device 32 is located between the first cooling air drying device 31 and the push-pull mechanism 2.

Preferably, the first cooling and air drying device 31 comprises a fixed disc 311, a water cooling pipe 312 and a driving mechanism 313;

the fixed plate 311 includes an arc-shaped hole 3111, and the water cooling pipe 312 passes through the arc-shaped hole 3111;

the driving mechanism 313 is connected to the fixed plate 311, and the water cooling pipe 312 is connected to the driving mechanism 313, so that the driving mechanism 313 drives the water cooling pipe 312 to move along the arc path of the arc hole 3111 or along the opening width direction of the arc hole 3111.

Preferably, the first cooling and air-drying device 31 further comprises an air-drying pipe 314, and the air-drying pipe 314 is connected with the fixed disk 311 so as to air-dry the closed vacuum quartz tube 25 sent out of the diffusion furnace 4.

Preferably, the diffusion furnace 4 comprises a heating furnace body 41 and a quartz inner tube 42, and the quartz inner tube 42 is positioned in the heating furnace body 41.

Preferably, the diffusion furnace 4 further comprises a temperature sensor 43, wherein the temperature sensor 43 is located inside the quartz inner tube 42 and is used for detecting the temperature in the diffusion furnace 4 in real time and uploading the temperature detected in real time to the PLC console 1.

Preferably, the automatic diffusion device further comprises a gas control mechanism 5, the gas control mechanism 5 is electrically connected with the PLC console 1, and the gas control mechanism 5 is mechanically connected with the quartz inner tube 42 and is configured to inject an inert gas into the quartz inner tube 42 to ensure that the pressure of the quartz inner tube 42 is positive pressure.

Preferably, the automatic diffusion device further comprises a camera 6, the camera 6 is electrically connected with the PLC console 1, and the camera 6 is configured to acquire appearance information of the closed vacuum quartz tube 25 loaded on the push-pull mechanism 2 and transmit the appearance information to the PLC console 1.

In a second aspect, the invention further provides a method for using an automatic diffusion device in a diffusion process, wherein each process parameter is input into the PLC console 1, so that the PLC console 1 sends an instruction according to the process parameter;

the diffusion furnace 4 raises the temperature in the diffusion furnace 4 to a preset threshold value according to the instruction of the PLC console 1;

the push-pull mechanism 2 sends the closed vacuum quartz tube 25 loaded by the push-pull mechanism 2 into the diffusion furnace 4 for heating according to the instruction of the PLC console 1;

the push-pull mechanism 2 sends the closed vacuum quartz tube 25 loaded by the push-pull mechanism 2 out of the diffusion furnace 4 according to the instruction of the PLC console 1;

and the cooling and air-drying mechanism 3 cools and air-dries the closed vacuum quartz tube sent out of the diffusion furnace 4 according to the instruction of the PLC console 1.

The invention has the beneficial effects that:

this send well PLC control cabinet 1, push-and-pull mechanism 2, cooling air-dry mechanism 3 and diffusion furnace 4 carry out the electricity and connect, can be through each technological parameter of input at PLC control cabinet 1, then send out various instructions to push-and-pull mechanism 2, cooling air-dry mechanism 3 and diffusion furnace 4 according to technological parameter, in order to reach the purpose of the whole diffusion technology of automatic control, because whole technological process is automatic control almost completely, easy operation, the possibility that the artificial misoperation takes place danger has been avoided to very big degree, and the time accuracy of automatic timing is high assurance, can be according to the real-time automatic judgement of on-the-spot dynamic condition and accurate control to cooling time and cooling position at every turn, can optimize the homogeneity and the uniformity of epitaxial wafer diffusion like this.

[ description of the drawings ]

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a diagram illustrating an automatic diffusion apparatus in a diffusion process according to an embodiment of the present invention;

FIG. 2 is a schematic structural diagram of an automatic diffusion apparatus in a diffusion process according to an embodiment of the present invention;

FIG. 3 is a schematic structural diagram of an automatic diffusion apparatus in a diffusion process according to an embodiment of the present invention;

FIG. 4 is a schematic structural diagram of a first cooling and air-drying device of an automatic diffusion device in a diffusion process according to an embodiment of the present invention;

FIG. 5 is a schematic structural diagram of a driving mechanism of an automatic diffusion apparatus in a diffusion process according to an embodiment of the present invention;

FIG. 6 is a schematic top view of a first cooling air drying device of an automatic diffusion apparatus for a diffusion process according to an embodiment of the present invention;

FIG. 7 is a schematic external view of a closed vacuum quartz tube obtained by a PLC console of an automatic diffusion device in a diffusion process according to an embodiment of the present invention;

FIG. 8 is a schematic diagram of the first cooling dryer position and the corresponding nozzle position of an automatic diffusion apparatus in a diffusion process according to an embodiment of the present invention;

FIG. 9 is a schematic external view of a closed vacuum quartz tube obtained by a PLC console of an automatic diffusion device in a diffusion process according to an embodiment of the present invention;

FIG. 10 is a schematic diagram of the first cooling dryer position and corresponding nozzle position of an automatic diffusion apparatus for a diffusion process according to an embodiment of the present invention;

FIG. 11 is a schematic external view of a closed vacuum quartz tube obtained by a PLC console of an automatic diffusion device in a diffusion process according to an embodiment of the present invention;

FIG. 12 is a schematic diagram of the first cooling dryer position and the corresponding nozzle position of an automatic diffusion apparatus for a diffusion process according to an embodiment of the present invention;

FIG. 13 is a schematic external view of a closed vacuum quartz tube obtained by a PLC console of an automatic diffusion apparatus in a diffusion process according to an embodiment of the present invention;

FIG. 14 is a schematic diagram of the first cooling dryer position and corresponding nozzle position of an automatic diffusion apparatus for a diffusion process according to an embodiment of the present invention;

fig. 15 is a schematic structural diagram of an air-drying duct of an automatic diffusion device in a diffusion process according to an embodiment of the present invention.

[ detailed description ] embodiments

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

In the description of the present invention, the terms "inner", "outer", "longitudinal", "lateral", "upper", "lower", "top", "bottom", and the like indicate orientations or positional relationships based on those shown in the drawings, and are for convenience only to describe the present invention without requiring the present invention to be necessarily constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention.

In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.

Example 1:

embodiment 1 of the present invention provides an automatic diffusion apparatus in a diffusion process, as shown in fig. 1 to 2, the automatic diffusion apparatus including: the device comprises a PLC console 1, a push-pull mechanism 2, a cooling and air-drying mechanism 3 and a diffusion furnace 4; the PLC console 1 is electrically connected with the push-pull mechanism 2, the cooling and air-drying mechanism 3 and the diffusion furnace 4; the push-pull mechanism 2 sends the closed vacuum quartz tube 25 loaded by the push-pull mechanism 2 into or out of the diffusion furnace 4 according to the instruction of the PLC console 1.

The PLC console 1 is electrically connected with the push-pull mechanism 2, and the push-pull mechanism 2 automatically makes corresponding actions according to instructions sent by the PLC console 1. The instructions sent by the PLC console 1 to the push-pull mechanism 2 include that the push-pull mechanism 2 sends the loaded closed vacuum quartz tube 25 into the diffusion furnace 4 at a set speed (which may be a constant speed or an acceleration), the time for heating the closed vacuum quartz tube 25 loaded by the push-pull mechanism 2 in the diffusion furnace 4, the time for sending the loaded closed vacuum quartz tube 25 out of the diffusion furnace 4 by the push-pull mechanism 2 at the set speed, the time for the closed vacuum quartz tube 25 loaded by the push-pull mechanism 2 to stay in the cooling and air-drying mechanism 3, and the like, wherein the movement speed of the push-pull mechanism 2 is controlled by the PLC console 1, and the present embodiment is only exemplified, and the types of the instructions sent by the PLC console 1 to the push-pull mechanism 2 are not limited to the above types.

And the cooling and air-drying mechanism 3 cools and air-dries the closed vacuum quartz tube loaded by the push-pull mechanism 2 according to the instruction of the PLC console 1.

The PLC control console 1 is electrically connected with the cooling and air-drying mechanism 3, and the cooling and air-drying mechanism 3 automatically makes corresponding actions according to instructions sent by the PLC control console 1. The instructions sent by the PLC console 1 to the cooling and air-drying mechanism 3 include water cooling time, water flow speed, water flow size, position of the water cooling pipe 312, air-drying time, etc. of the cooling and air-drying mechanism 3.

And the diffusion furnace 4 heats the diffusion furnace 4 according to the instruction of the PLC console 1.

The PLC console 1 is electrically connected with the diffusion furnace 4, and the diffusion furnace 4 automatically makes corresponding actions according to instructions sent by the PLC console 1. Through the three-section temperature control function of the PLC control console 1 for the diffusion furnace 4, the temperature of the diffusion furnace 4 is heated according to the set heating curve, meanwhile, the PLC control console 1 monitors the temperature in the diffusion furnace 4 in real time so as to modify the heating curve, and therefore the temperature of a constant temperature area is guaranteed to be stable within a set temperature range.

Wherein, in the initial state, the cooling and air-drying mechanism 3 is positioned between the push-pull mechanism 2 and the diffusion furnace 4.

The embodiment provides a mode that can be realized in an actual scene, specifically:

as shown in fig. 3, the push-pull mechanism 2 includes a motor 21, a guide rail 22, an L-shaped quartz rod 23 and a stage 24, wherein one end of the L-shaped quartz rod 23 is connected to the guide rail 22, and the other end of the L-shaped quartz rod 23 is connected to the stage 24, and the stage 24 is used for carrying a closed vacuum quartz tube 25. The motor 21 is used for driving the guide rail 22 to rotate, and the rotation of the guide rail 22 drives the L-shaped quartz rod 23 to reciprocate along the guide rail 22 so as to convey the closed vacuum quartz tube 25 loaded by the push-pull mechanism 2 into or out of the diffusion furnace 4. The manufacturing method of the closed vacuum quartz tube 25 specifically comprises the following steps: the epitaxial wafer and the diffusion source were put in a quartz tube, and the quartz tube was sealed with hydrogen-oxygen flame after evacuation to obtain a sealed vacuum quartz tube 25.

The diffusion furnace 4 comprises a heating furnace body 41, a quartz inner tube 42 and a temperature sensor 43, the automatic diffusion device comprises a gas control mechanism 5, wherein the quartz inner tube 42 is located inside a cavity of the heating furnace body 41, the cavity of the heating furnace body 41 can be round or square, a furnace tube is arranged inside the cavity of the heating furnace body 41, a furnace opening is arranged at an opening of the cavity, a first furnace door (not marked in the figure) is arranged at the furnace opening, a constant temperature area is arranged in the middle of the quartz inner tube 42, and the constant temperature area is a diffusion area of the closed vacuum quartz tube 25 (namely the closed vacuum quartz tube 25 is heated and diffused in the constant temperature area); the temperature sensor 43 is positioned inside the quartz inner tube 42 and is used for detecting the temperature in the diffusion furnace 4 in real time and uploading the temperature detected in real time to the PLC console 1, so that the PLC console 1 can conveniently adjust the temperature of the diffusion furnace 4; the gas control mechanism 5 is connected to a tail portion of the quartz inner tube 42 and is configured to introduce an inert gas into the quartz inner tube 42, where the inert gas may be specifically nitrogen, and the inert gas is introduced into the quartz inner tube 42 to ensure that the quartz inner tube 42 maintains a micro-positive pressure, so as to prevent impurities or other gases from entering the quartz inner tube 42.

The cooling and air-drying mechanism 3 comprises a first cooling and air-drying device 31 and a second cooling and air-drying device 32, wherein the first cooling and air-drying device 31 and the second cooling and air-drying device 32 are respectively used for conveniently feeding or sending out the sealed vacuum quartz tube 25 of the diffusion furnace 4, the cooling and air-drying mechanism 3 is superposed with the horizontal central line of the quartz inner tube 42, the first cooling and air-drying device 31 is used for carrying out water cooling and air drying on the sealed vacuum quartz tube 25 sent out of the diffusion furnace 4 (the air drying is specifically used for blowing out high-flow gas to achieve the purpose of air drying), the second cooling and air-drying device 32 is used for carrying out secondary air drying on the sealed vacuum quartz tube 25 which is cooled and air dried by the first cooling and air-drying device 31, wherein the second air-drying device 32 can be composed of a fan, and the main purpose is used for drying the residual moisture of the quartz tube and other action mechanisms.

In order to optimize the motion mode of the push-pull mechanism 2, as shown in fig. 3, the push-pull mechanism 2 comprises a motor 21, a guide rail 22, an L-shaped quartz rod 23 and an object stage 24, wherein the motor 21 is connected with the guide rail 22; one end of the L-shaped quartz rod 23 is connected with the guide rail 22, the other end of the L-shaped quartz rod 23 is connected with the object stage 24, and the object stage 24 is used for bearing and sealing a vacuum quartz tube 25; the motor 21 is used for driving the guide rail 22 to rotate, so as to drive the L-shaped quartz rod 23 to be sent into or out of the diffusion furnace 4.

The push-pull mechanism 2 comprises a motor 21, a guide rail 22, an L-shaped quartz rod 23 and an object stage 24, wherein one end of the L-shaped quartz rod 23 is connected with the guide rail 22, the other end of the L-shaped quartz rod 23 is connected with the object stage 24, and the object stage 24 is used for bearing a closed vacuum quartz tube 25. The motor 21 is used for driving the guide rail 22 to rotate, and the rotation of the guide rail 22 drives the L-shaped quartz rod 23 to reciprocate along the guide rail 22 so as to convey the closed vacuum quartz tube 25 loaded by the push-pull mechanism 2 into or out of the diffusion furnace 4.

Wherein, guide rail 22 is the guide rail 22 that has the external screw thread, the one end of being connected with guide rail 22 in the L type quartz rod 23 is provided with the internal thread with the external screw thread fit of guide rail 22, and when motor 21 rotated, motor 21 can drive guide rail 22 rotates, because L type quartz rod 23 is provided with the internal thread with guide rail 22 external screw thread fit, consequently the rotation of guide rail 22 can drive L type quartz rod 23 makes reciprocating motion along guide rail 22.

In order to further optimize the cooling seasoning mechanism 3, as shown in fig. 3, the cooling seasoning mechanism 3 includes a first cooling seasoning device 31 and a second seasoning device 32; in the initial state, the secondary air drying device 32 is located between the first cooling air drying device 31 and the push-pull mechanism 2.

The method specifically comprises the following steps: the cooling and air-drying mechanism 3 comprises a first cooling and air-drying device 31 and a second cooling and air-drying device 32, wherein the first cooling and air-drying device 31 and the second cooling and air-drying device 32 are respectively used for conveniently feeding or sending out the diffusion furnace 4 from the closed vacuum quartz tube 25, the cooling and air-drying mechanism 3 is coincided with the horizontal central line of the quartz inner tube 42, the first cooling and air-drying device 31 is used for carrying out water cooling and air drying on the closed vacuum quartz tube 25 sent out of the diffusion furnace 4 (the air drying at the position is specifically used for blowing out high-flow gas to achieve the air drying purpose), the second cooling and air-drying device 32 is used for carrying out secondary air drying on the closed vacuum quartz tube 25 which is cooled and air-dried by the first cooling and air-drying device 31, wherein the second air-drying device 32 can be composed of a fan, and the main purpose is used for drying residual moisture.

In practical application scenarios, since the different appearances of the closed vacuum quartz tube 25 cause different priorities of the cooling positions of the closed vacuum quartz tube 25, the position of the water cooling tube 312 needs to be automatically adjusted according to the appearance of the closed vacuum quartz tube 25.

As shown in fig. 4, the first cooling and air drying device 31 includes a fixed disk 311, a water cooling pipe 312 and a driving mechanism 313;

the fixed plate 311 includes an arc-shaped hole 3111, and the water cooling pipe 312 passes through the arc-shaped hole 3111;

the fixed disk 311 may be circular, square, or the like, the number of the arc-shaped holes 3111 is at least 2, and the number of the water-cooling tubes 312 matches the number of the arc-shaped holes 3111; the water-cooling pipe 312 passes through the arc-shaped hole 3111, wherein after the water-cooling pipe 312 passes through the arc-shaped hole 3111, the nozzle of the water-cooling pipe 312 faces downwards so as to water-cool the closed vacuum quartz tube 25 which is sent out of the diffusion furnace 4. The water cooling pipe 312 has a diameter smaller than the opening width of the arc hole 3111 so that the water cooling pipe 312 can move along an arc path in the arc hole 3111 or along the opening width direction of the arc hole 3111.

The driving mechanism 313 is connected to the fixed plate 311, and the water cooling pipe 312 is connected to the driving mechanism 313, so that the driving mechanism 313 drives the water cooling pipe 312 to move along the arc path of the arc hole 3111 or along the opening width direction of the arc hole 3111.

As shown in fig. 5, the driving mechanism 313 includes a first motor 3131, a rotating disc 3132, a second motor 3133, and a push-pull rod 3134, a base of the first motor 3131 is fixedly connected to the fixed disc 311, a driving end of the first motor 3131 is connected to the rotating disc 3132, so that the first motor 3131 drives the rotating disc 3132 to rotate, the rotating disc 3132 is connected to the second motor 3133, so that the rotating disc 3132 drives the second motor 3133 to rotate, thereby moving the water-cooled tube 312 along the arc-shaped path of the arc-shaped hole 3111, the driving end of the second motor 3133 is connected to the push-pull rod 3134, and a free end of the push-pull rod 3134 is connected to the water-cooled tube 312, so that the second motor 3133 drives the push-pull rod 3134 to drive the water-cooled tube 312 to move along the opening width direction of the arc-shaped hole 3111 (i.e. the second motor 3133 drives the push-pull rod 3134 to drive the water-cooled tube 312 to move back and forth on the push-pull rod 3134). The number of the driving mechanisms 313 is matched with the number of the water cooling pipes 312 and the number of the arc-shaped holes 3111.

In order to facilitate the PLC console 1 to automatically adjust the position of the water cooling tube 312 according to the appearance of the closed vacuum quartz tube 25, as shown in fig. 1 and 3, the automatic diffusing device further includes a camera 6, the camera 6 is electrically connected to the PLC console 1, and the camera 6 is configured to obtain appearance information of the closed vacuum quartz tube 25 loaded on the push-pull mechanism 2, and transmit the appearance information to the PLC console 1. The camera 6 may be disposed on the first cooling air-drying device 31 or the second cooling air-drying device 32, and is mainly used for collecting appearance information of the closed vacuum quartz tube 25, and then sending the collected appearance information of the closed vacuum quartz tube 25 to the PLC console 1, and the PLC console 1 automatically adjusts the position of each water-cooling tube 312 according to the collected appearance information of the closed vacuum quartz tube 25. Therefore, the position of the camera 6 can be set according to actual requirements, and the position where the appearance information of the closed vacuum quartz tube 25 can be collected is within the protection scope of the present invention.

The embodiment provides a mode that can be realized in an actual scene, specifically:

assuming that the shape of the fixed plate 311 of the first cooling airing device 31 is circular in this embodiment, the number of the arc holes 3111 on the fixed plate 311 is 4, and the number of the corresponding water cooling tubes 312 and the driving mechanisms 313 is also 4, the four arc holes are respectively a first arc hole, a second arc hole, a third arc hole and a fourth arc hole, the first water cooling tube 3121 and the first driving mechanism 3135 are matched with the first arc hole, the second water cooling tube 3122 and the second driving mechanism 3136 are matched with the second arc hole, the third water cooling tube 3123 and the third driving mechanism 3137 are matched with the third arc hole, and the fourth water cooling tube 3124 and the fourth driving mechanism 3138 are matched with the fourth arc hole. The initial state of the first cooling and air-drying device 31 is shown in fig. 6, and the PLC console 1 automatically adjusts the positions of the water-cooling tubes according to the collected appearance information of the closed vacuum quartz tube 25.

The first condition is as follows: the appearance information of the closed vacuum quartz tube 25 collected by the camera 6 is shown in fig. 7, the PLC console 1 judges that the position of the water cooling tube does not need to be adjusted according to the collected appearance information of the closed vacuum quartz tube 25, the upper diagram of fig. 8 shows the position of the water cooling tube on the fixed disk 311, and the lower diagram of fig. 8 shows the final state of the corresponding spraying position of the closed vacuum quartz tube 25.

Case two: the appearance information of the closed vacuum quartz tube 25 collected by the camera 6 is shown in fig. 9, and the PLC console 1 automatically adjusts the positions of the water cooling tubes according to the collected appearance information of the closed vacuum quartz tube 25, specifically: the position of the water-cooling tube on the fixed disk 311 in the initial position state and the water-cooling tube spraying position in the second case are shown in fig. 10 1a, when the PLC console 1 automatically adjusts the positions of the water-cooling tubes according to the collected appearance information of the closed vacuum quartz tubes 25, the first driving mechanism 3135 drives the first water-cooling tube 3121 to move a corresponding distance from the initial position toward the direction close to the center of the circular disk to reach a designated position (i.e., the driving mechanism 313 drives the water-cooling tube to move along the opening width direction of the arc-shaped hole 3111), and fig. 10 b shows a final state in which the water-cooling tubes are at the position of the fixed disk 311 and the corresponding spraying position of the closed vacuum quartz tubes 25 in the second case after the positions of the water-cooling tubes are adjusted.

Case three: the appearance information of the closed vacuum quartz tube 25 collected by the camera 6 is shown in fig. 11, and the PLC console 1 automatically adjusts the positions of the water cooling tubes according to the collected appearance information of the closed vacuum quartz tube 25, specifically: in the initial position state, the position of the water-cooling tube on the fixed disk 311 and the water-cooling tube in the third case are shown in fig. 122 a, when the PLC console 1 automatically adjusts the positions of the water-cooling tubes according to the collected appearance information of the closed vacuum quartz tube 25, the first driving mechanism 3135 drives the first water-cooling tube 3121 to move a corresponding distance from the initial position toward the direction close to the center of the circular disk to reach a designated position, and the second driving mechanism 3136 drives the second water-cooling tube 3122 to move a corresponding distance from the initial position toward the direction close to the center of the circular disk to reach the designated position; the third driving mechanism 3137 drives the third water-cooling tube 3123 to move a corresponding distance from the initial position to a direction close to the center of the circular disc to reach a designated position; the fourth driving mechanism 3138 drives the fourth water-cooling tube 3124 to move a corresponding distance from the initial position toward the direction close to the center of the circular disc to reach a designated position, where the movement toward the direction close to the center of the circular disc is that the driving mechanism drives the water-cooling tube to move along the opening width direction of the arc-shaped hole 3111, and fig. 10, 2b is a final state of the water-cooling tube at the position of the fixed disk 311 and the spraying position of the corresponding closed vacuum quartz tube 25 in case three after the position of the water-cooling tube is adjusted.

Case four: the appearance information of the closed vacuum quartz tube 25 collected by the camera 6 is shown in fig. 13, and the PLC console 1 automatically adjusts the positions of the water cooling tubes according to the collected appearance information of the closed vacuum quartz tube 25, specifically: the position of the water-cooling tube on the fixed disc 311 and the water-cooling tube water spraying position under the condition of four in the initial position state are shown in fig. 14 3a, when the PLC console 1 automatically adjusts the positions of the water-cooling tubes according to the collected appearance information of the closed vacuum quartz tube 25, after the first driving mechanism 3135 drives the first water-cooling tube 3121 to move a corresponding distance from the initial position toward the direction close to the center of the circular disc, the first driving mechanism 3135 drives the first water-cooling tube 3121 to move a corresponding distance counterclockwise along the arc-shaped path of the arc-shaped hole 3111 to reach a specified position; the second driving mechanism 3136 drives the second water-cooling tube 3122 to move a corresponding distance from the initial position toward a direction close to the center of the circular disc to reach a designated position, the third driving mechanism 3137 drives the third water-cooling tube 3123 to move a corresponding distance from the initial position toward the direction close to the center of the circular disc, the third driving mechanism 3137 drives the third water-cooling tube 3123 to move a corresponding distance clockwise along the arc path of the arc hole 3111 to reach the designated position, and 3b in fig. 14 is a final state of the water-cooling tube at the position of the fixed disc 311 and the spraying position of the closed vacuum quartz tube 25 corresponding to the case four after the position of the water-cooling tube is adjusted.

In order to facilitate the PLC console 1 to monitor whether the corresponding water cooling tube 312 has moved to a designated position, a corresponding position sensor may be installed at a suitable position to transmit the position of the water cooling tube 312 to the PLC console 1, so that the PLC console 1 makes a corresponding adjustment to the position of the water cooling tube 312.

In order to facilitate air drying of the water-cooled moisture on the surface of the closed vacuum quartz tube 25, as shown in fig. 15, the first cooling and air-drying device 31 further includes an air-drying tube 314, and the air-drying tube 314 is connected to the fixed disk 311 so as to air-dry the closed vacuum quartz tube 25 sent out of the diffusion furnace 4. The air drying pipe 314 is used for blowing out high-flow gas, which may be nitrogen, air, or the like, and is not described in detail herein.

The method specifically comprises the following steps: as shown in fig. 2-4, after the PLC console 1 controls the push-pull mechanism 2 to send the loaded closed vacuum quartz tube 25 out of the diffusion furnace 4, the cooling and air-drying mechanism 3 is started, the nozzle of the water-cooling pipe 312 of the first cooling and air-drying device 31 sprays deionized water to cool the closed vacuum quartz tube 25 which is sent out of the diffusion furnace 4, the deionized water is closed, high flow nitrogen is started to blow dry water drops closing the vacuum quartz tube 25 and other parts, wherein the high flow nitrogen is blown out from the air drying pipe 314, the nitrogen is closed after a period of time, the closed vacuum quartz tube 25 loaded by the push-pull mechanism 2 is moved to a secondary air drying device 32, the secondary air drying device 32 carries out secondary air drying on the closed vacuum quartz tube 25 which is cooled by water and dried by the first cooling air drying device 31, the secondary air drying device 32 may be composed of a fan, and is mainly used for drying the residual moisture. And after the secondary air drying device 32 dries the L-shaped quartz rod 23 and the closed vacuum quartz tube 25 loaded on the push-pull mechanism 2, resetting the equipment to finish diffusion, and finishing the process.

The temperature in the diffusion furnace 4 is obtained in real time in order to facilitate PLC control, so that the PLC console 1 can adjust the temperature of the diffusion furnace 4; as shown in fig. 3, the diffusion furnace 4 further comprises a temperature sensor 43, wherein the temperature sensor 43 is located inside the quartz inner tube 42 and is used for detecting the temperature in the diffusion furnace 4 in real time and uploading the temperature detected in real time to the PLC console 1. Through the three-section temperature control function of the PLC control console 1 for the diffusion furnace 4, the temperature of the diffusion furnace 4 is heated according to the set heating curve, meanwhile, the PLC control console 1 can utilize the temperature sensor 43 to monitor the temperature in the diffusion furnace 4 in real time so as to modify the heating curve, and therefore the constant temperature area is guaranteed to keep stable in temperature within the set temperature range.

In order to prevent impurities or other gases from entering the quartz inner tube 42, as shown in fig. 1-2, the automatic diffusion apparatus further includes a gas control mechanism 5, the gas control mechanism 5 is electrically connected to the PLC console 1, and the gas control mechanism 5 is mechanically connected to the quartz inner tube 42, and is configured to inject an inert gas into the quartz inner tube 42 to ensure that the pressure of the quartz inner tube 42 is a positive pressure. The inert gas may specifically be other gases such as nitrogen.

In order to facilitate the PLC console 1 to automatically adjust the positions of the water-cooled tubes 312 according to the temperature of the closed vacuum quartz tube 25, thereby ensuring uniformity and consistency of epitaxial wafer diffusion, this embodiment may further include an infrared thermal imager, where the infrared thermal imager is mainly used to collect the temperature of the closed vacuum quartz tube 25 sent out of the diffusion furnace 4, and after the infrared thermal imager transmits the collected temperature to the PLC console 1, the PLC console 1 automatically adjusts the positions of the water-cooled tubes 312 according to the temperature of the closed vacuum quartz tube 25, such as: the position of each water cooled tube 312 can be adjusted to preferentially cool the higher temperature regions of the closed vacuum quartz tube 25. Wherein, the mounted position of infrared thermal imager can be adjusted according to actual demand.

Example 2

Based on the automatic diffusion device in the diffusion process provided in embodiment 1, this embodiment further provides a method for using the automatic diffusion device in the diffusion process, where each process parameter is input into the PLC console, so that the PLC console sends an instruction according to the process parameter; the diffusion furnace raises the temperature in the diffusion furnace to a preset threshold value according to the instruction of a PLC console; the push-pull mechanism sends the closed vacuum quartz tube loaded by the push-pull mechanism into a diffusion furnace for heating according to the instruction of a PLC console; the push-pull mechanism sends the closed vacuum quartz tube loaded by the push-pull mechanism out of the diffusion furnace according to the instruction of the PLC console; and the cooling and air-drying mechanism cools and air-dries the closed vacuum quartz tube sent out of the diffusion furnace according to the instruction of the PLC console.

The embodiment provides a mode that can be realized in an actual scene, specifically:

step 1, firstly, setting a preset temperature of the diffusion furnace 4 through the PLC console 1, wherein the preset temperature is the temperature required by the closed vacuum quartz tube 25 for diffusion, such as 450-550 ℃.

And 2, automatically starting the gas control mechanism 5, and inputting small-flow nitrogen into the quartz inner tube 42 through the gas control mechanism 5 so as to ensure that the quartz inner tube 42 is in a micro-positive pressure state.

And 3, after a period of time, detecting that the temperature of the diffusion furnace 4 is stabilized to the temperature required by the closed vacuum quartz tube 25 for diffusion by the temperature sensor 43.

And 4, setting technological parameters such as time required by diffusion of the closed vacuum quartz tube 25, cooling time and the like through the PLC console 1.

And 5, opening the first furnace door by the automatic diffusion device, and controlling the push-pull mechanism 2 by the PLC console 1 to feed the loaded closed vacuum quartz tube 25 into the constant temperature area of the diffusion furnace 4 at a set speed.

And 6, automatically timing by the PLC console 1, and when the timing is finished (namely the time required by the diffusion of the closed vacuum quartz tube 25 is reached), sending the loaded closed vacuum quartz tube 25 out of the diffusion furnace 4 by the push-pull mechanism 2 at the set speed.

Step 7, after the PLC console 1 controls the push-pull mechanism 2 to send the loaded closed vacuum quartz tube 25 out of the diffusion furnace 4, the cooling and air-drying mechanism 3 is started, deionized water is sprayed on a nozzle of a water-cooling tube 312 of the first cooling and air-drying device 31 (the PLC adjusts the nozzle in real time according to the collected appearance and temperature change information of the quartz tube) to carry out water cooling on the closed vacuum quartz tube 25 sent out of the diffusion furnace 4, after a period of time, the deionized water is closed, high-flow nitrogen is started to blow water drops of the closed vacuum quartz tube 25 and other components, wherein the high-flow nitrogen is blown out from the air-drying tube 314, after a period of time, the nitrogen is closed, the closed vacuum quartz tube 25 loaded by the push-pull mechanism 2 is moved to a secondary air-drying device 32, the secondary air-drying device 32 carries out secondary air-drying on the closed vacuum quartz tube 25 which is cooled and air-dried by the first cooling and air-drying device 31, wherein the secondary air-drying device 32 can be composed of a fan, the main purpose is to blow dry the residual moisture. And after the secondary air drying device 32 dries the L-shaped quartz rod 23 and the closed vacuum quartz tube 25 loaded on the push-pull mechanism 2, resetting the equipment to finish diffusion, and finishing the process.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.