Reworked piece auxiliary device for screen printing and reworked piece cleaning method for screen printing

Abstract

The invention relates to the technical field of monocrystalline silicon solar cells, and discloses a rework piece auxiliary device for silk-screen printing and a rework piece cleaning method for silk-screen printing. The rework piece auxiliary device for silk-screen printing comprises a box body and a cover body, the box body is provided with a bearing cavity and an open end which are communicated, the bearing cavity can contain alcohol, the cover body can be connected to the box body and can open and close the open end, a basket can be placed in the bearing cavity and can be detachably connected with the box body, the basket is provided with an insertion groove, and a rework piece can be inserted into the insertion groove. The cleaning method of the reworked piece for silk-screen printing comprises the following steps: selecting a flower basket; the flower basket is placed in the bearing cavity; alcohol is added into the bearing cavity; inserting the reworked piece into the slot; taking out the reworked piece and wiping; and cleaning the reworked piece by using a reworking machine. Abnormal rework sheets can be treated in time, slurry is prevented from being dried, and the rework efficiency and the rate of finished products are high.

Description

Technical Field

[0001] The invention relates to the technical field of single crystal silicon solar cells, and in particular to a screen printed rework sheet auxiliary device and a screen printed rework sheet cleaning method. Background Art

[0002] Silk screen is an indispensable process in the production of solar cells. Its function is to print electrode slurry onto solar cells and then form weldable electrodes through sintering so that minority carriers and holes can be smoothly guided out. Various defects are inevitable in the silk screen production process, such as back laser pattern offset, coating abnormality, emitter pattern offset, emitter mark point abnormality, etc. If this type of silk screen abnormal slurry sheet is further processed into solar cells, the efficiency is low and the electroluminescence defect detection (EL, Electroluminescence) is seriously polluted. It must be downgraded to B or C products, which is a huge loss. In the existing rework process, operators need to handle the reworked sheets at any time, which has high labor costs and low efficiency. If the reworked sheets cannot be handled in time, the slurry on the reworked sheets will dry up and increase the difficulty of subsequent cleaning.

[0003] Therefore, there is an urgent need for a screen printing rework sheet auxiliary device and a screen printing rework sheet cleaning method to solve the above problems. Summary of the invention

[0004] Based on the above, the purpose of the present invention is to provide a screen printing rework sheet auxiliary device and a screen printing rework sheet cleaning method, which can promptly handle abnormal rework sheets and prevent the slurry from drying out, with high rework efficiency and yield rate.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] Screen printing rework sheet auxiliary device, including:

[0007] A carrying box, comprising a box body and a cover body, wherein the box body has a communicating carrying cavity and an open end, wherein the carrying cavity can contain alcohol, and the cover body can be connected to the box body and can open and close the open end;

[0008] The flower basket can be placed in the bearing cavity and can be detachably connected to the box body. The flower basket has a slot, and the rework sheet can be inserted into the slot.

[0009] As a preferred solution of the screen-printed rework sheet auxiliary device, a first connecting portion is provided on the cavity wall of the bearing cavity, and a second connecting portion is provided on the flower basket, and the first connecting portion and the second connecting portion are detachably connected.

[0010] As a preferred solution of the screen printing rework sheet auxiliary device, it also includes a connecting piece, the first connecting part is a hanging ring arranged on the cavity wall of the bearing cavity, the second connecting part is a through hole opened on the flower basket, and the connecting piece can pass through the hanging ring and the through hole.

[0011] As a preferred solution of the screen printing rework sheet auxiliary device, the distance between two adjacent slots is 6mm-8mm.

[0012] As a preferred solution of the screen-printed rework sheet auxiliary device, both the outer side surface of the box body and the cavity wall of the bearing cavity are provided with an acid- and alkali-resistant layer.

[0013] A method for cleaning a reworked sheet of screen printing, based on the auxiliary device for reworked sheet of screen printing described in any of the above technical solutions, the method for cleaning a reworked sheet of screen printing comprises the following steps:

[0014] S1: Selecting the flower basket of corresponding size according to the size of the reworked piece;

[0015] S2: placing the flower basket into the bearing cavity and connecting it to the box body;

[0016] S3: adding alcohol into the bearing chamber, and the alcohol liquid level covers the flower basket;

[0017] S4: inserting the abnormal rework sheet into the slot and closing the open end with the cover;

[0018] S5: taking out the reworked sheets from the flower basket and wiping the reworked sheets;

[0019] S6: inserting the wiped reworked sheet into a production line basket, and cleaning the reworked sheet in the production line basket with a rework machine to remove residual silver ions, silicon oxide and silicon oxide film.

[0020] As a preferred solution of the screen printing rework sheet cleaning method, the rework machine includes a first rework machine, and the step S6 includes:

[0021] S61: adding a nitric acid solution into the first rework machine, and immersing the reworked sheets in the production line basket into the nitric acid solution to remove the residual silver ions;

[0022] S62: cleaning the reworked wafer after cleaning with the nitric acid solution by plasma water bubbling;

[0023] S63: Drying the reworked sheet.

[0024] As a preferred solution of the method for cleaning the reworked sheet of screen printing, the rework machine further includes a second rework machine, and after step S63, further includes:

[0025] S64: adding a hydrochloric acid solution and a hydrofluoric acid solution into the second rework machine, and soaking the reworked sheets in the production line basket in the hydrochloric acid solution and the hydrofluoric acid solution to remove the silicon oxide and the silicon oxide film;

[0026] S65: cleaning the reworked sheet after being cleaned by the hydrochloric acid solution and the hydrofluoric acid solution by plasma water bubbling;

[0027] S66: Drying the reworked sheet.

[0028] As a preferred solution of the screen printing rework sheet cleaning method, the step S61 and the step S62 are repeated twice; and / or the step S64 and the step S65 are repeated twice.

[0029] As a preferred solution of the method for cleaning the reworked sheet of screen printing, before the step S66, the reworked sheet after the plasma water bubbling cleaning is cleaned again with water by a slow pulling method.

[0030] The beneficial effects of the present invention are:

[0031] The present invention provides a rework sheet auxiliary device for screen printing, which includes a carrying box and a flower basket. By setting a box body capable of holding alcohol, when a slurry sheet is abnormal during the screen printing process, it needs to be reworked. The rework sheet is inserted into the slot of the flower basket, and the rework sheet is soaked in alcohol, so that the slurry on the rework sheet is in a wet state, so as to avoid the adhesion of organic solvents after the slurry becomes dry, which makes it difficult to remove silver ions, etc., and reduces the difficulty of subsequent cleaning, improves the cleanliness, and thus improves the rework efficiency and the yield of silicon wafers after rework. At the same time, after the rework sheet is inserted into the slot, the cover body closes the open end of the box body to reduce the volatilization of alcohol in the carrying cavity. The rework sheet auxiliary device for screen printing is convenient for operators to quickly handle the slurry sheets found in the screen printing process, reduces the difficulty of subsequent operations, and is conducive to the unified treatment of the slurry sheets, improving the treatment efficiency and the yield of finished products.

[0032] The present invention also provides a method for cleaning reworked sheets for screen printing, by adding alcohol into the above-mentioned bearing cavity and making the alcohol cover the flower basket, so that the reworked sheets are completely immersed in the alcohol, which is convenient for operators to quickly handle the slurry sheets found in the screen printing process to prevent the slurry from drying and adhering; when reworking, the reworked sheets in the flower basket are taken out and wiped to remove the slurry that is easy to wipe off the surface of the reworked sheets, and then the reworked sheets are cleaned by a rework machine to remove residual silver ions, silicon oxide and silicon oxide film. The cleaning of the wet reworked sheets through the above process can effectively remove the slurry on the silicon wafer, the rework efficiency is high, the rework effect is better, and the economic loss is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments of the present invention. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the contents of the embodiments of the present invention and these drawings without paying any creative work.

[0034] Figure 1 It is a structural schematic diagram of a screen printing rework sheet auxiliary device provided by an embodiment of the present invention;

[0035] Figure 2 is a structural schematic diagram of a flower basket provided by an embodiment of the present invention;

[0036] Figure 3 is a schematic structural diagram of a carrier box provided by an embodiment of the present invention;

[0037] Figure 4 The process of the screen printing rework sheet cleaning method provided by the embodiment of the present invention is Figure 1 ;

[0038] Figure 5 The process of the screen printing rework sheet cleaning method provided by the embodiment of the present invention is Figure 2 .

[0039] In the figure:

[0040] 1. Carrying box; 11. Box body; 111. Base; 112. Main body; 12. Cover body; 10. Carrying cavity; 101. First connecting portion;

[0041] 2. Flower basket; 20. Slot; 21. Second connecting part. DETAILED DESCRIPTION

[0042] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0043] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0044] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0045] In the description of the present embodiment, the terms "upper", "lower", "left", "right" and other directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation of the present invention. In the description of the present invention, unless otherwise specified, the meaning of "plurality" is two or more. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0046] like Figures 1 to 3 As shown, this embodiment provides a screen-printed rework sheet auxiliary device, which includes a carrier box 1 and a flower basket 2. The carrier box 1 includes a box body 11 and a cover body 12. The box body 11 has a connected carrier cavity 10 and an open end. The carrier cavity 10 can hold alcohol. The cover body 12 can be connected to the box body 11 and can open and close the open end. For example, the cover body 12 is rotatably connected to the box body 11 through a hinge and can be sealed with the open end of the box body 11. Of course, the cover body 12 can also be separated from the box body 11 and can be sealed at the open end. The flower basket 2 can be placed in the carrier cavity 10 and can be detachably connected to the box body 11. The flower basket 2 has a slot 20, and the rework sheet can be inserted into the slot 20. By setting a box body 11 capable of holding alcohol, when an abnormality occurs in the slurry sheet during the screen printing process, rework is required, and the rework sheet is inserted into the slot 20 of the flower basket 2, and the rework sheet is soaked in alcohol, so that the slurry on the rework sheet is in a wet state, and the organic solvent is prevented from adhering to the slurry after it dries, which makes it difficult to remove silver ions, etc., and reduces the difficulty of subsequent cleaning, improves the cleanliness, and thus improves the rework efficiency and the yield of silicon wafers after rework. At the same time, after the rework sheet is inserted into the slot 20, the cover body 12 closes the open end of the box body 11 to reduce the volatilization of alcohol in the bearing cavity 10. The screen printing rework sheet auxiliary device facilitates the operator to quickly handle the slurry sheet found in the screen printing process, reduces the difficulty of subsequent operations, and is conducive to the unified treatment of the slurry sheet, improving the treatment efficiency and the yield of the finished product.

[0047] In this embodiment, the appearance of the flower basket 2 is the same as the flower basket 2 in the prior art. The flower basket 2 can carry multiple rework sheets, for example, it can carry 30 rework sheets at the same time. Of course, in other embodiments, the number of rework sheets that the flower basket 2 can carry can also be other, such as 20 sheets, 35 sheets, 40 sheets, etc., which is set according to actual needs.

[0048] Exemplarily, the length, width and height of the flower basket 2 are 242.3mm, 186mm and 191mm respectively. Of course, in other embodiments, the length, width and height of the flower basket 2 may also be other, which is not limited here, and can be set according to actual needs. Preferably, the spacing between two adjacent slots 20 is 6mm-8mm. The longer length of the flower basket 2 makes the spacing between two adjacent slots 20 larger. Compared with the spacing between two adjacent slots 20 in the prior art of less than 4mm, the flower basket 2 provided in this embodiment makes the spacing between two adjacent rework sheets larger after the rework sheet is inserted into the slot 20, for example, 7.4mm, which can effectively avoid the adsorption and adhesion of two adjacent rework sheets, facilitate the subsequent removal of slurry, and improve the cleaning effect.

[0049] Preferably, the flower basket 2 is made of acid- and alkali-resistant material, such as polyvinylidene fluoride (PVDF), which has good acid resistance and prevents the flower basket 2 from being corroded by slurry or alcohol.

[0050] In order to prevent the carrying box 1 from tipping over, the box body 11 includes a base 111 and a main body 112 arranged around the base 111. The cover body 12 can cover the end of the main body 112 away from the base 111. The outer edge of the base 111 exceeds the outer periphery of the main body 112, that is, the area of ​​the base 111 is larger than the projection area of ​​the main body 112 on the base 111, thereby improving the stability of the box body 11 and preventing alcohol leakage. Exemplarily, the base 111 is a rectangular parallelepiped with a length, width and height of 396.05mm, 321.5mm, and 8mm, and the main body 112 is a rectangular parallelepiped with a length, width and height of 336.05mm, 261.5mm, and 240mm. Of course, the shapes and sizes of the base 111 and the main body 112 can also be other, for example, the base 111 is disc-shaped and the main body 112 is cylindrical. The size is not limited here and is set according to actual needs.

[0051] Preferably, the outer side of the box body 11 and the cavity wall of the bearing cavity 10 are both provided with an acid-resistant layer to prevent alcohol and slurry from corroding the box body 11 and extend the service life of the box body 11. Exemplarily, the box body 11 includes a first layer, a second layer, a third layer, a fourth layer and a fifth layer arranged in sequence from the inside to the outside. The first layer and the fifth layer are both acid-resistant and alkali-resistant plates with a thickness of 8 mm. The second layer and the fourth layer are both stainless steel plates with a thickness of 2 mm to prevent alcohol from leaking after the acid-resistant and alkali-resistant plates melt when alcohol catches fire. The third layer is a fire-resistant filling layer with a thickness of 8 mm, that is, the second layer and the fourth layer are filled with fire-resistant materials to reduce heat transfer when alcohol catches fire and increase emergency time; the structural composition of the base 111 can be the same as or different from the main body 112. Under the above structure, the box body 11 has a long service life and high safety in use. More preferably, the cover 12 is filled with fire-resistant materials, which can effectively retard flames after being covered, further improving safety.

[0052] Furthermore, a first connection part 101 is provided on the cavity wall of the bearing cavity 10, and a second connection part 21 is provided on the flower basket 2, and the first connection part 101 and the second connection part 21 are detachably connected. After the flower basket 2 is placed in the box body 11, the connection between the first connection part 101 and the second connection part 21 allows the flower basket 2 to remain stable relative to the box body 11, thereby preventing the flower basket 2 from shaking and deviating in the bearing cavity 10, resulting in some reworked sheets not being completely soaked in alcohol or the flower basket 2 being stuck, etc., thereby improving the reliability of the flower basket 2. Moreover, the first connection part 101 and the second connection part 21 are detachable, which facilitates the removal of the flower basket 2 and improves practicality.

[0053] Specifically, the screen-printed rework sheet auxiliary device also includes a connecting piece, the first connecting part 101 is a hanging ring arranged on the cavity wall of the bearing cavity 10, the second connecting part 21 is a through hole opened on the flower basket 2, and the connecting piece can pass through the hanging ring and the through hole. When the flower basket 2 is placed in the accommodating cavity, the through hole and the hanging ring are arranged correspondingly, and the flower basket 2 is positioned by the connecting piece, which has a simple structure and is easy to operate. Among them, the connecting piece can be selected but not limited to a cable tie, for example, the connecting piece can also be a bolt and a nut.

[0054] Preferably, if Figure 2 and Figure 3 As shown, a through hole is respectively provided at the four corners of the flower basket 2, and two hanging rings are respectively provided on the two opposite walls of the bearing cavity 10. Four cable ties are used to connect a through hole and a hanging ring in a one-to-one correspondence, so that the four corners of the flower basket 2 are fixed to ensure the stability of the flower basket 2. Of course, in other embodiments, the number and position of the through holes on the flower basket 2 and the number and position of the hanging rings on the bearing cavity 10 may also be other, which are not limited here.

[0055] like Figure 4As shown, this embodiment also provides a method for cleaning a rework sheet of screen printing, and the method for cleaning a rework sheet of screen printing is based on the above-mentioned rework sheet auxiliary device of screen printing, and specifically includes the following steps:

[0056] S1: Select a flower basket 2 of corresponding size according to the size of the reworked piece;

[0057] S2: Place the flower basket 2 into the carrying cavity 10 and connect it to the box body 11;

[0058] S3: Add alcohol into the bearing chamber 10, and the alcohol liquid level covers the flower basket 2, and the alcohol is preferably industrial alcohol;

[0059] After the flower basket 2 is placed in the bearing cavity 10, a connecting piece is used to connect the through hole on the flower basket 2 and the hanging ring on the bearing cavity 10, so that the position of the flower basket 2 is fixed, the flower basket 2 is prevented from shaking in the bearing cavity 10, and the flower basket 2 can always be completely immersed in alcohol.

[0060] S4: inserting the abnormal rework sheet into the slot 20 and closing the open end of the cover 12;

[0061] During the screen printing process, when the staff finds an abnormal slurry sheet, rework is required. The staff can place the rework sheet in the slot 20 in time and soak it in alcohol to prevent the slurry from changing and adhering to increase the difficulty of subsequent cleaning; after the rework sheet is placed in the slot 20, covering the cover 12 can effectively reduce the volatilization of alcohol, and it can be opened when an abnormal rework sheet appears next time.

[0062] S5: Take out the reworked sheets in the flower basket 2 and wipe the reworked sheets;

[0063] After taking out the rework piece from the alcohol, remove the slurry that can be wiped off the surface of the rework piece by wiping, preferably by wiping with a dust-free cloth soaked in alcohol or pine oil. Of course, the rework piece taken out can also be sent to the rework room and inserted into the rework basket for ultrasonic cleaning, and alcohol or pine oil can be added to the ultrasonic cleaning machine to improve the cleaning effect.

[0064] S6: Insert the wiped reworked sheet into the production line basket, and use the rework machine to clean the reworked sheet in the production line basket to remove residual silver ions, silicon oxide and silicon oxide film. After removing most of the slurry on the surface of the reworked sheet by dust-free cloth or ultrasonic cleaning machine, there will still be residual silver ions, silicon oxide and silicon oxide film and other metal ions on the surface of the reworked sheet. The rework machine will completely remove the residual metal ions, so that the reworked sheet after cleaning has a higher yield rate, which is convenient for re-texturing and saving costs.

[0065] The method for cleaning the reworked sheet of screen printing provided in this embodiment adds alcohol to the above-mentioned bearing cavity 10, and makes the alcohol cover the flower basket 2, so that the reworked sheet is completely immersed in the alcohol, which is convenient for operators to quickly handle the slurry sheets found in the screen printing process to prevent the slurry from drying and adhering; when reworking, take out the reworked sheet in the flower basket 2, wipe the reworked sheet to remove the slurry that is easy to wipe off the surface of the reworked sheet, and then clean the reworked sheet through a rework machine to remove residual silver ions, silicon oxide and silicon oxide film. The cleaning of the wet reworked sheet through the above process can effectively remove the slurry, the rework efficiency is high, the rework effect is better, and the economic loss is reduced.

[0066] Specifically, Figure 5 As shown, the rework machine includes a first rework machine, and step S6 includes:

[0067] S61: adding nitric acid solution to the first rework machine, and immersing the reworked sheets in the basket of the production line into the nitric acid solution to remove residual silver ions;

[0068] Exemplarily, the mass fraction of nitric acid is 10%-50%, for example, the mass fraction of nitric acid is 20%, 30%, 40%, etc., and the process time is 10 minutes-20 minutes, for example, the process time is 15 minutes, 18 minutes, etc.

[0069] S62: cleaning the reworked wafer after cleaning with the nitric acid solution by using plasma water bubbling;

[0070] Exemplarily, the ion water bubbling cleaning time is 100 seconds to 400 seconds. For example, the reworked wafer after being cleaned with nitric acid solution is cleaned with plasma water bubbling for 200 seconds, 300 seconds or 350 seconds, etc., which is set according to actual needs.

[0071] Preferably, steps S61 and S62 are repeated twice to remove residual silver ions on the surface of the reworked sheet as much as possible and improve the yield.

[0072] S63: Drying the reworked sheet.

[0073] More specifically, the rework machine further includes a second rework machine, and the first rework machine and the second rework machine are preferably slot machines. After step S63, the method further includes:

[0074] S64: Hydrochloric acid solution and hydrofluoric acid solution are added to the second rework machine, and the reworked sheets in the production line basket are immersed in the hydrochloric acid solution and hydrofluoric acid solution to remove silicon oxide and silicon oxide film; the hydrochloric acid solution and hydrofluoric acid solution can also remove other metal ions, such as sodium ions in sweat.

[0075] Exemplarily, a hydrofluoric acid solution with a mass fraction of 35%-55% and a hydrochloric acid solution with a mass fraction of 30%-45% are used, for example, the mass fraction of the hydrofluoric acid solution is 40%, 45% or 50%, etc., the mass fraction of the hydrochloric acid solution is 35%, 40%, etc., the hydrofluoric acid solution is 100 liters-200 liters, and the hydrochloric acid solution is 10 liters-100 liters, for example, the hydrofluoric acid solution is 130 liters, 150 liters or 180 liters, and the hydrochloric acid solution is 30 liters, 50 liters or 80 liters.

[0076] S65: cleaning the reworked wafer after cleaning with hydrochloric acid and hydrofluoric acid solutions by plasma water bubbling;

[0077] Exemplarily, the ion water bubbling cleaning time is 100 seconds to 400 seconds. For example, the reworked sheet after being cleaned with hydrochloric acid and hydrofluoric acid solutions is bubbled with plasma water for 200 seconds, 300 seconds or 350 seconds, etc., which is set according to actual needs.

[0078] Preferably, steps S64 and S65 are repeated twice to remove metal ions such as silicon oxide and silicon oxide film on the surface of the reworked wafer as much as possible to improve the yield.

[0079] More preferably, after repeating steps S64 and S65 twice, the reworked sheet is cleaned again with water, preferably plasma water, by a slow pull method. Optionally, the slow pull process time is 50 seconds to 400 seconds, for example, the slow pull process time is 200 seconds, 300 seconds or 350 seconds, etc., and the temperature is 60°C to 90°C, for example, the temperature of the plasma water is 70°C, 80°C or 85°C, etc. Cleaning the reworked sheet by a slow pull method can further wash away metal ions or other impurities on the surface of the reworked sheet, thereby improving the product yield.

[0080] S66: Drying the reworked sheet.

[0081] The screen printing rework sheet cleaning method provided in this embodiment can effectively improve the rework efficiency and yield rate. Three groups of experiments were used as the control group, and the results were as follows:

[0082] Control group 1:

[0083] The abnormal slurry sheet is further processed and printed, and the sintered finished product is tested for efficiency and electroluminescent defect detection.

[0084] The efficiency of the control group was 22.8% and the yield was 0%.

[0085] The slurry sheets selected for the control group 1 had a partial offset of the back laser pattern, and the efficiency loss was not large, but they were all downgraded to B products, with a loss of 1.4 yuan per sheet.

[0086] Control group 2:

[0087] Collect abnormal slurry pieces uniformly;

[0088] Then wipe off the slurry with alcohol at the same time (some slurry cannot be removed);

[0089] The slurry sheet is inserted into the production line basket;

[0090] Use a tank rework machine to clean the silicon wafer, and add a certain concentration of nitric acid to the rework tank to remove the residual silver ions on the silicon wafer;

[0091] Use a tank rework machine for cleaning, add a certain concentration of hydrofluoric acid and hydrochloric acid to the rework tank to clean and remove silicon nitride and silicon oxide films;

[0092] Retexturing rework production, finished product testing efficiency and electroluminescence defect detection.

[0093] The efficiency of the control group was 21.5% and the yield was 10%.

[0094] The slurry of the slurry sheet in the control group 2 has dried, and the organic solvent adhesion is difficult to remove, and most of the silver ions cannot be removed, resulting in poor efficiency and electroluminescent defect detection.

[0095] Control group three:

[0096] If abnormal slurry appears, wipe the slurry off the silicon wafer with a dust-free cloth soaked in alcohol as soon as possible;

[0097] Collect slurry sheets uniformly;

[0098] The slurry sheet is inserted into the production line basket;

[0099] Use a tank rework machine to clean the silicon wafer, and add a certain concentration of nitric acid to the rework tank to remove the residual silver ions on the silicon wafer;

[0100] Use a tank rework machine for cleaning, add a certain concentration of hydrofluoric acid and hydrochloric acid to the rework tank to clean and remove silicon nitride and silicon oxide films;

[0101] Retexturing rework production, finished product testing efficiency and electroluminescence defect detection.

[0102] The efficiency of the control group was 22.5% and the yield was 50%.

[0103] In the actual operation of control group 3, it is necessary to wipe with a dust-free cloth soaked in alcohol immediately, which is a lot of work and difficult to operate in batches. In addition, some slurry is not removed cleanly, resulting in loss of efficiency and electroluminescent defect detection.

[0104] The screen-printed rework cleaning method provided in this embodiment has an efficiency of 23.4% and a yield of 90%, thereby minimizing the efficiency and electroluminescent defect detection losses.

[0105] Note that the above are only preferred embodiments of the present invention and the technical principles used. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in more detail through the above embodiments, the present invention is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A screen printing rework sheet auxiliary device, characterized in that: include: A carrying box (1) comprises a box body (11) and a cover body (12), wherein the box body (11) has a carrying cavity (10) and an open end which are connected to each other, wherein the carrying cavity (10) can contain alcohol, and the cover body (12) can be connected to the box body (11) and can open and close the open end; The flower basket (2) can be placed in the bearing cavity (10) and can be detachably connected to the box body (11); the flower basket (2) has a slot (20) and a rework sheet can be inserted into the slot (20).

2. The screen printing rework sheet auxiliary device according to claim 1, characterized in that: A first connection portion (101) is provided on the cavity wall of the bearing cavity (10), and a second connection portion (21) is provided on the flower basket (2); the first connection portion (101) and the second connection portion (21) are detachably connected.

3. The screen printing rework sheet auxiliary device according to claim 2, characterized in that: It also comprises a connecting piece, wherein the first connecting part (101) is a hanging ring arranged on the cavity wall of the bearing cavity (10), and the second connecting part (21) is a through hole opened on the flower basket (2), and the connecting piece can pass through the hanging ring and the through hole.

4. The screen printing rework sheet auxiliary device according to any one of claims 1 to 3, characterized in that: The distance between two adjacent slots (20) is 6 mm to 8 mm.

5. The screen printing rework sheet auxiliary device according to any one of claims 1 to 3, characterized in that: The outer side surface of the box body (11) and the cavity wall of the bearing cavity (10) are both provided with an acid and alkali resistant layer.

6. A method for cleaning a rework sheet for screen printing, based on the rework sheet auxiliary device for screen printing according to any one of claims 1 to 5, characterized in that: The screen-printed rework sheet cleaning method comprises the following steps: S1: Selecting the flower basket (2) of corresponding size according to the size of the reworked sheet; S2: placing the flower basket (2) into the carrying cavity (10) and connecting it to the box body (11); S3: adding alcohol into the bearing chamber (10), and the alcohol liquid level covers the flower basket (2); S4: inserting the abnormal rework sheet into the slot (20) and closing the open end with the cover (12); S5: taking out the reworked sheets from the flower basket (2) and wiping the reworked sheets; S6: inserting the wiped reworked sheet into a production line basket, and cleaning the reworked sheet in the production line basket with a rework machine to remove residual silver ions, silicon oxide and silicon oxide film.

7. The method for cleaning a reworked sheet of screen printing according to claim 6, characterized in that: The rework machine includes a first rework machine, and the step S6 includes: S61: adding a nitric acid solution into the first rework machine, and immersing the reworked sheets in the production line basket into the nitric acid solution to remove the residual silver ions; S62: cleaning the reworked wafer after cleaning with the nitric acid solution by plasma water bubbling; S63: Drying the reworked sheet.

8. The method for cleaning a reworked sheet of screen printing according to claim 7, characterized in that: The rework machine further includes a second rework machine, and after step S63, further includes: S64: adding a hydrochloric acid solution and a hydrofluoric acid solution into the second rework machine, and soaking the reworked sheets in the production line basket in the hydrochloric acid solution and the hydrofluoric acid solution to remove the silicon oxide and the silicon oxide film; S65: cleaning the reworked sheet after being cleaned by the hydrochloric acid solution and the hydrofluoric acid solution by plasma water bubbling; S66: Drying the reworked sheet.

9. The method for cleaning a screen printed rework sheet according to claim 8, characterized in that: The step S61 and the step S62 are repeated twice; and / or the step S64 and the step S65 are repeated twice.

10. The method for cleaning a reworked sheet of screen printing according to claim 8, characterized in that: Before the step S66, the reworked sheet after the plasma water bubbling cleaning is cleaned again with water in a slow pulling manner.

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