CN114361298A - Solar cell preparation system and preparation method - Google Patents
Solar cell preparation system and preparation method Download PDFInfo
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- CN114361298A CN114361298A CN202210276134.0A CN202210276134A CN114361298A CN 114361298 A CN114361298 A CN 114361298A CN 202210276134 A CN202210276134 A CN 202210276134A CN 114361298 A CN114361298 A CN 114361298A
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Abstract
The invention provides a solar cell preparation system which comprises an extrusion injection system, a carrier system and a supporting and moving system, wherein the extrusion injection system comprises an injection device, a spray head and an extrusion device, the injection device is used for containing conductive slurry, the spray head comprises one or more nozzles, the spray head is directly connected with the injection device, the extrusion device is used for pressing the conductive slurry in the injection device to be extruded to a preset area on a base material through the nozzles of the spray head, the carrier system comprises a carrier for bearing the base material, and the supporting and moving system is used for supporting the extrusion injection system and enabling the spray head and the carrier to generate relative displacement.
Description
Technical Field
The invention belongs to the field of solar cells, and relates to a solar cell preparation system and a preparation method.
Background
Among the numerous renewable energy technologies, photovoltaic power generation is undoubtedly one of the most promising possibilities. In addition, the development of the crystalline silicon solar cell is fastest in recent years, and the degree of resource investment or industrialization of research and development is much higher than that of other types of photovoltaic cells. It is obvious that crystalline silicon solar cells have been the mainstream technology in photovoltaic power generation technology.
A photovoltaic cell is a device that converts light energy into electrical energy. The structure of the photovoltaic cell takes silicon material as a substrate, wherein one side of the silicon material is a P-type semiconductor, and the other side of the silicon material is an N-type semiconductor, and a semiconductor PN junction is formed at the junction of the two semiconductors due to the diffusion of electrons and holes. When sunlight irradiates a photovoltaic cell, electron-hole pairs are generated in the cell. Due to the action of the semiconductor PN junction, the electron-hole pairs are separated. Electrons flow to the N-type semiconductor region and holes move in the opposite direction to the P-type semiconductor region. The N area is negatively charged, the P area is positively charged, a potential difference is formed between the two areas, and current is generated after the circuit is switched on.
Since the semiconductor is made of silicon material as a substrate, it is not possible to directly conduct current out of the semiconductor by means of contact wires, and it is necessary to perform a Metallization (Metallization) process with metal electrodes at two ends of the P-type semiconductor and the N-type semiconductor individually to reduce the resistance, so that the current generated after illumination enters the electronic device through the metal wires. The metallization process includes coating or printing metal slurry at corresponding positions according to requirements, and sintering the silicon material and the metal at a high temperature.
In the production process of crystalline silicon solar cells, silver paste is usually selected as a material for metallization with silicon materials. Most manufacturers currently use screen printing as a means of applying silver paste to silicon.
The current mainstream technology for coating the solar conductive paste is screen printing, and the screen printing has the great characteristic of high speed. More than 2500 times per hour can be printed. The paste also allows for good aspect ratios on the cell silicon wafer after printing. However, screen printing also has some disadvantages, such as higher screen price. In recent years, the requirements for the line width and the aspect ratio of the sub-grid become more and more stringent, so some screen manufacturers develop a screen without mesh junction, and although the line type and the line width have good effects, the price is much higher than that of the conventional screen. After the screen printing plate is used for a period of time, the tension can be gradually reduced, so that the width of the grid line is widened, the height-width ratio is reduced, and the photoelectric conversion efficiency is reduced. Therefore, after a period of use, the screen must be replaced, which becomes a cost that must be paid for, as do other consumables used with screen printing.
In recent years, solar cell manufacturers have spread large-sized silicon wafers in order to reduce processing costs. The photovoltaic silicon wafer size directly affects the downstream cell and module size. There are currently 5 predominant sizes of photovoltaic silicon wafers, 156.75mm, 158.75mm, 166mm, 182mm, 210mm, respectively. The large-size silicon wafer enlarges the size of the assembly by increasing the area of the silicon wafer, so that the processing cost of each link is reduced. However, pushing large-sized silicon wafers is also prone to different difficulties, for example, equipment tables need to be updated, and devices such as carriers, positioning devices and the like of the tables need to be updated and replaced from the beginning of wafer manufacturing. Especially, the coating of the slurry is a great test. The large-size silicon wafer has higher requirements on the coating property of the slurry. The screen printed pattern becomes larger, and the size of the screen frame is not enlarged. During screen printing, the tension applied to the middle area and the edge of the pattern during printing is different, so that the situation of grid breaking or line expansion is easily caused as a result of printing. It is difficult to achieve a uniform line pattern between the center and the edge.
Therefore, there is a need in the art for a system and method for manufacturing solar cells that is relatively low cost and suitable for use with substrates of different sizes.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a solar cell preparation system and a preparation method, which have the advantages of low cost, suitability for base materials (especially large-size silicon wafers) with different sizes, difficulty in grid breaking and wire expansion, good center and edge consistency and the like. Compared with the conventional screen printing, the screen printing method does not need to replace the screen printing plate or other consumables, so that the cost can be reduced; the invention is suitable for coating the conductive paste on the substrate with any shape and size, and can prepare the solar cell with any shape and size.
Specifically, the invention provides a solar cell preparation system, which comprises an extrusion injection system, a carrying platform system and a supporting and moving system;
the extrusion injection system comprises an injection device, a spray head and an extrusion device, wherein the injection device is used for containing the conductive paste, the spray head comprises one or more nozzles, the spray head is directly connected with the injection device, and the extrusion device is used for pressurizing the conductive paste in the injection device to extrude the conductive paste to a preset area on a base material through the nozzles of the spray head;
the stage system comprises a stage for carrying a substrate;
the supporting and moving system is used for supporting the extrusion injection system and enabling the spray head and the carrier to generate relative displacement.
In one or more embodiments, the extrusion device comprises a screw extrusion device and/or a piston extrusion device.
In one or more embodiments, the extrusion injection system and/or the stage system includes a temperature adjustment device for adjusting the temperature of the conductive paste.
In one or more embodiments, the angle of the showerhead relative to the substrate can be adjusted.
In one or more embodiments, the nozzle has a flat opening.
In one or more embodiments, the support and movement system comprises a first movement device for moving the spray head and/or a second movement device for moving the stage.
In one or more embodiments, the solar cell preparation system further comprises a control system for controlling the operation of the extrusion injection system and the support and movement system.
In one or more embodiments, the solar cell preparation system further comprises a UV system for UV curing of the conductive paste on the substrate.
In one or more embodiments, the solar cell preparation system further comprises a thermal drying system for thermally drying the conductive paste on the substrate.
In one or more embodiments, the support and movement system comprises an H-shaped support frame comprising two vertical bars and a cross bar that spans between the two vertical bars, the extrusion injection system is fixed on the cross bar of the H-shaped support frame, and the cross bar of the H-shaped support frame can move up and down along the vertical bars.
In one or more embodiments, the supporting and moving system further comprises two sliding rails and two sliding blocks respectively matched with the two sliding rails, and the two sliding blocks are respectively connected with the bottoms of the two vertical rods of the H-shaped supporting frame.
In one or more embodiments, the support and movement system includes one or more slide rails that cooperate with the stage to enable the stage to move along the slide rails.
In one or more embodiments, the extrusion injection system includes a back plate, a motor, a screw, a syringe injector, and a spray head, the extrusion injection system is connected to the support and movement system through the back plate, the motor is used for rotating the screw, the syringe injector includes a syringe for containing conductive paste and a piston for applying pressure to the conductive paste, the screw is connected to the piston of the syringe injector, a paste outlet is formed at the bottom of the syringe injector, and the spray head is connected to the paste outlet.
In one or more embodiments, the spray head is a multi-port spray head, the multi-port spray head comprises a connecting port, a spray head entity, a spray head cavity and a nozzle, the multi-port spray head is connected to a slurry outlet at the bottom of the injection device through the connecting port, and the spray head entity is internally provided with the spray head cavity for containing conductive slurry and the plurality of nozzles communicated with the spray head cavity.
The invention also provides a solar cell preparation method, which comprises the step of preparing a solar cell by using the solar cell preparation system of any embodiment of the invention.
Drawings
Fig. 1 is a schematic diagram of a solar cell preparation system according to a first embodiment of the invention. In fig. 1, 1 is an extrusion injection system, 2 is a nozzle, 3 is a syringe injector, 4 is conductive paste, and 5 is a base material.
Fig. 2 is a schematic diagram of a solar cell preparation system according to a second embodiment of the invention. In fig. 2, 100 is a control system, 200 is an extrusion injection system, 300 is a support device, 400 is a moving device, 500 is a stage, and 600 is a base material.
Fig. 3 is a schematic view of an extrusion injection system in a solar cell manufacturing system according to a second embodiment of the present invention. In fig. 3, 210 is a back plate, 220 is a motor, 230 is a screw, 240 is a syringe injector, 250 is conductive paste, and 260 is a multi-nozzle.
Fig. 4 is a cross-sectional view of a multi-nozzle showerhead in a solar cell preparation system according to a second embodiment of the present invention. In fig. 4, 261 is a connection port, 262 is a showerhead entity, 263 is a showerhead chamber, and 264 is a nozzle.
Detailed Description
To make the features and effects of the present invention comprehensible to those skilled in the art, general description and definitions are made below with reference to terms and expressions mentioned in the specification and claims. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
In this context, for the sake of brevity, not all possible combinations of features in the various embodiments or examples are described. Therefore, the respective features in the respective embodiments or examples may be arbitrarily combined as long as there is no contradiction between the combinations of the features, and all the possible combinations should be considered as the scope of the present specification.
The present invention provides systems and methods for fabricating solar cells. The invention relates to a solar cell preparation method and a solar cell preparation system, in particular to a method and a system for coating a solar cell conductive paste, which replace a common screen printing mode to coat the conductive paste on a preset area. Therefore, the solar cell preparation system and the preparation method of the present invention are also referred to as a coating system and a coating method of a solar cell conductive paste herein. The invention is suitable for preparing solar cells of the types including conventional polycrystal, conventional monocrystal, N type, PERC, TOPCON, heterojunction and the like. The substrate of a solar cell is typically a silicon wafer. The method is suitable for preparing silicon wafer solar cells and HIT solar cells. The HIT solar cell is a hybrid type solar cell made of a crystalline silicon substrate and an amorphous silicon thin film. Therefore, the substrate suitable for the present invention may be a crystalline silicon wafer, or a composite substrate of crystalline silicon and amorphous silicon.
The coating system (hereinafter referred to as coating system) of the solar cell conductive paste comprises an extrusion injection system, a carrying platform system and a supporting and moving system. The extrusion injection system is used to extrude the conductive paste to a predetermined area on the substrate to be coated. The extrusion injection system comprises an injection device, a spray head and an extrusion device. The injection device is used for containing the conductive paste. The spray head includes one or more spray nozzles. The extrusion device is used for pressing the conductive paste in the cavity to extrude the conductive paste to a preset area on the base material to be coated through a nozzle of the spray head. The stage system includes a stage for carrying a substrate to be coated. The carrying platform is arranged below the spray head. The supporting and moving system is used for supporting the extrusion injection system and enabling the spray head and the carrier to generate relative displacement. The support and movement system may comprise a relatively independent support system and movement system consisting of one or more devices that respectively undertake support and movement functions, or may consist of one or more devices that undertake both support and movement functions.
The material of the injection device, the nozzle head and the extrusion device of the extrusion injection system can be independently selected from solid materials such as metal (for example, stainless steel) and polymer (for example, polytetrafluoroethylene). The injection device, the nozzle head and the extrusion device may each also be composed of a combination of parts of different materials.
The injection device has a cavity capable of containing the conductive paste, and a paste outlet of the injection device (typically located at the bottom of the injection device) is connected to the spray head. The injection device or its cavity preferably has a temperature control function. The injection device can comprise a piston matched with the cavity, the piston can move in the cavity and push the conductive paste in the cavity into the spray head through the conductive paste outlet, the piston can be connected with the extrusion device, and the extrusion device provides extrusion force for the piston. The cavity of the injection device may be designed in the shape of a syringe. In some embodiments, the injection device is a syringe injector. Preferably, the injection device is in a sealed state, and the conductive paste in the injection device is in contact with the outside only at the paste outlet.
The spray head may comprise one or more nozzles, preferably a plurality of nozzles, allowing the conductive paste to be simultaneously sprayed from the plurality of nozzles, thereby achieving simultaneous formation of a plurality of grid lines on the substrate. The nozzle is preferably replaceable, and the line diameter and line shape can be adjusted by using nozzles with different diameters and shapes to coat the main grid and the auxiliary grid. The nozzle shape can be a flat opening for coating the long strip shape of the main grid silver paste. The radius of the nozzle may be 10-50 μm, for example 30. + -.5 μm. Preferably, the nozzle pitch of the shower head is adjustable, and the distance between the control lines can be controlled by the nozzle pitch. Preferably, the angle of the spray head relative to the substrate is adjustable, which is beneficial to flexibly controlling the distance of the spray head relative to the substrate and the direction of the conductive paste when being sprayed. In some embodiments, the spray head is a multi-port spray head, and the multi-port spray head may include a connection port, a spray head entity, a spray head cavity and a nozzle, the multi-port spray head is connected to the slurry outlet at the bottom of the injection device through the connection port, and the spray head entity is internally formed with the spray head cavity for containing the conductive slurry and the plurality of nozzles communicated with the spray head cavity.
Extrusion devices suitable for use in the present invention may be screw extrusion devices, piston extrusion devices, and the like. Either screw extrusion or piston extrusion may be used, or both may be used in combination (e.g., in series) as the extrusion device. In some embodiments, the extrusion device is a screw extrusion device.
In some embodiments, the extrusion injection system includes a back plate, a motor for rotating the screw, a screw connected to the piston of the syringe injector, a syringe for containing the conductive paste and a piston for pressurizing the conductive paste, a syringe injector having a syringe bottom with a paste outlet, and a spray head connected to the paste outlet.
In the invention, the size of the coated wire diameter can be controlled by controlling the caliber of the nozzle, the extrusion speed and the moving speed of the carrying platform and/or the spray head.
For different sized substrates, the coating area can be adjusted by replacing different sized extrusion injection systems. The requirement of different grid line numbers can be met by adjusting the number of the nozzles. The number of nozzles and the distance between the nozzles can be determined according to actual requirements.
In the present invention, the extrusion injection system (e.g., extrusion device) and/or the stage system (e.g., stage) may include a temperature adjustment device for controlling the fluidity of the conductive paste by adjusting the temperature of the conductive paste. In some embodiments, the extrusion injection system includes a temperature adjustment device for adjusting the temperature of the extrusion device and/or the spray head to adjust the temperature of the conductive paste in the extrusion device and/or the spray head to achieve control over the fluidity of the conductive paste.
In the present invention, the support and movement system includes one or more moving devices. The moving device is used for enabling the spray head and the carrier of the extrusion injection system to generate relative displacement. In some embodiments, the support and movement system comprises first movement means capable of moving the head so as to allow relative displacement between the head and the stage with the stage fixed. For example, the supporting and moving system may comprise an H-shaped support frame, the H-shaped support frame comprises two vertical bars and a cross bar erected between the two vertical bars, the extrusion injection system is fixed on the cross bar of the H-shaped support frame, the cross bar of the H-shaped support frame can move up and down along the vertical bars, and the carrier is arranged below the H-shaped support frame, thereby realizing height adjustment between the extrusion injection system and the carrier. Furthermore, the supporting and moving system can also comprise two slide rails and two slide blocks which are respectively matched with the two slide rails, the two slide blocks are respectively connected with the bottoms of the two vertical rods of the H-shaped supporting frame, and the carrier is arranged between the two slide rails, so that the horizontal displacement of the extrusion injection system relative to the carrier is realized. In some embodiments, the support and movement system comprises second movement means capable of moving the carrier, thereby enabling relative displacement between the head and the carrier with the squeeze injection system stationary. The base material loaded on the carrying platform can be driven to the lower part of the spray head by the second moving device along with the carrying platform. For example, the support and movement system may comprise one or more slide rails cooperating with the carrier for enabling the carrier to move along the slide rails, which slide rails may be arranged at the bottom or at the sides of the carrier. In some implementations, the support and movement system includes a first movement device capable of moving the compression injection system and a second movement device capable of moving the stage.
The coating system of the present invention may also include a control system. The control system is used for controlling the extrusion injection system and the supporting and moving system to work. The control system may be a computer. The control system may be connected to the extrusion injection system and the support and movement system by wired or wireless means.
The coating system of the present invention may also include a UV system and/or a thermal drying system. The UV system and the thermal drying system are used to perform UV curing and thermal drying, respectively, on the conductive paste coated on the substrate. After the conductive paste is applied to the substrate using the coating system or the coating method of the present invention, heat drying or UV curing may be further performed.
The coating method of the solar cell conductive paste comprises the step of coating the conductive paste by using the coating system. Generally, the substrate is fixed on the stage, the relative position between the nozzle and the stage is adjusted to a position suitable for coating by using a supporting and moving system, the angle of the nozzle is preferably adjusted, and the height of the nozzle outlet from the substrate is preferably set to be 1-3mm, which is beneficial to the conductive paste to be coated on the substrate smoothly and stably. And then, pressing the conductive paste in the injection device by an extrusion device of an extrusion injection system to extrude the conductive paste to a preset coating area on the base material through a nozzle of a spray head, simultaneously moving the extrusion injection system and/or the carrying platform by a supporting and moving system to enable the extruded conductive paste to form grid lines on the base material according to design requirements, and adjusting the line diameter of the grid lines by controlling the caliber size of the nozzle, the extrusion speed and the moving speed of the extrusion injection system and/or the carrying platform. In the invention, the coating can be carried out in a mode that the extrusion injection system moves and the carrier is fixed, or the extrusion injection system is fixed and the carrier moves, or the extrusion injection system and the carrier move simultaneously. Before formal coating, the extrusion device can be started to extrude a small amount of conductive paste to discharge redundant air in the spray head, and the residual conductive paste at the outlet of the spray nozzle is wiped to avoid the occurrence of broken lines or irregular splashing.
The coating may be performed using an injection device that has been previously charged with the conductive paste, or the charging of the conductive paste may be performed before the coating. When the conductive paste is filled, the conductive paste is usually defoamed, for example, the conductive paste is put into a defoaming machine, stirred and defoamed, and bubbles in the paste are removed. The conductive paste is then carefully filled, using auxiliary equipment, into, for example, an injection device, which is then assembled, for example, into an extrusion injection system, and connected to a spray head.
In some embodiments, the coating system of the present invention comprises a control system, and the operation of the extrusion injection system and the support and movement system can be controlled by the control system, for example, when coating is started, the control system can set the operation program of the support and movement system, thereby controlling the initial position of the extrusion injection system, the extrusion progress and extrusion speed, and controlling the initial position of the carrier, and controlling the movement route and movement rate of the extrusion injection system, and the carrier is fixed, or controlling the movement route and movement rate of the carrier, and the extrusion injection system is fixed, or controlling the movement route and movement rate of both the extrusion injection system and the carrier.
After coating is complete, the coated wire may be cured, baked and/or sintered. The curing may be thermal curing and/or UV curing.
The invention has the following advantages: compared with the conventional screen printing, the screen printing method does not need to replace the screen printing plate or other consumables, so that the cost can be reduced; the invention is suitable for coating the conductive paste on the base material with any shape and size, and can prepare the solar cell with any shape and size; the line diameter and the line shape can be adjusted through the caliber of the nozzle, and the main grid and the auxiliary grid are coated; the distance between the gate lines can be controlled by the nozzle pitch; the coating can be rapidly and continuously carried out; the conductive slurry can be stored in a temperature-controllable cavity, and the coating property and the fluidity of the slurry can be controlled by the temperature; the conductive paste exists in a closed cavity, so that volatilization is not needed, and a low-boiling-point environment-friendly solvent can be used; the invention has no problems of screen rebound and ink splashing. In addition, the spray head is directly connected with the injection device instead of the extrusion device, and the design can avoid broken lines or irregular splashing caused by mixing air into the slurry when the slurry is added to the spray nozzle; the angle of the spray head is adjustable, and the angle of the spray nozzle relative to the substrate is also easy to adjust; the way of replacing the paste is also more convenient, and the supplier can fill the conductive paste into the injection device (e.g., syringe injector) and sell the injection device filled with the conductive paste directly after removing the air.
The present invention will be described in detail with reference to specific examples, but the present invention is not limited to the specific examples. Any omission, replacement or modification made by those skilled in the art based on the disclosed embodiments of the present invention will fall within the scope of the present invention.
Example one
A solar cell preparation system includes an extrusion injection system 1 (shown in fig. 1), a stage system (not shown in fig. 1), and a support and movement system (not shown in fig. 1). The squeeze injection system 1 includes a spray head 2 and a syringe injector 3. The spray head 2 comprises a plurality of spray nozzles. The syringe injector 3 includes a syringe for containing the conductive paste 4 and a piston for pressurizing the conductive paste 4. The plunger presses the conductive paste 4 in the cylinder to be extruded through the nozzle of the nozzle 2 to a predetermined area on the substrate 5 to be coated. The stage system includes a stage (not shown in fig. 1) for carrying a substrate to be coated. The carrying platform is arranged below the spray head. The supporting and moving system is used for supporting the extrusion injection system and enabling the spray head and the carrier to generate relative displacement.
Example two
A solar cell preparation system, as shown in FIG. 2, includes a control system 100, an extrusion injection system 200, a support device 300, a moving device 400, a carrier 500, and a base. The control system 100 is a computer for controlling the operation of the extrusion injection system 200, the supporting device 300 and the moving device 400. The support device 300 is an H-shaped support frame. The H-shaped support frame comprises two vertical rods and a cross rod erected between the two vertical rods. The extrusion injection system 200 is secured to the cross bar of the H-shaped support frame. The horizontal pole of H shape support frame can reciprocate along the montant. The moving device 400 includes two sliding rails and two sliding blocks respectively matching with the two sliding rails. Two slide rails of the mobile device 400 are disposed on the base, and the carrier 500 is located between the two slide rails of the mobile device 400. The two sliding blocks are respectively connected with the two vertical rods of the H-shaped supporting frame. The slide block moves on the slide rail, so that the relative displacement between the extrusion injection system 200 and the carrier 500 can be realized. The coating system further comprises two slide rails arranged between the carrier 500 and the base and matched with the carrier 500, the carrier 500 can move along the two slide rails, and relative displacement between the extrusion injection system 200 and the carrier 500 can be realized under the condition that the extrusion injection system 200 is fixed.
As shown in FIG. 3, the extrusion injection system 200 includes a back plate 210, a motor 220, a screw 230, an injector 240, and a multi-port nozzle 260. The extrusion injection system 200 is connected to the support device 300 through the back plate 210. The motor 220 is used to rotate the screw 230. The injector 240 includes a syringe for receiving the conductive paste 250 and a piston for pressurizing the conductive paste 250. The screw 230 is connected to the piston of the syringe 240. The syringe 240 has a slurry outlet at the bottom of the barrel, and a multi-port nozzle 260 is connected to the slurry outlet. The screw 230 is used to push the piston of the syringe 240. The screw 230 is rotated by the motor 220, and the piston of the injector 240 is pushed to apply pressure to the conductive paste 250, so that the conductive paste 250 is extruded from the multi-port nozzle 260.
As shown in fig. 4, multi-port showerhead 260 includes a connection port 261, a showerhead body 262, a showerhead chamber 263 and a nozzle 264. The multi-port nozzle 260 is connected to the slurry outlet port at the bottom of the barrel of the injector 240 through a connection port 261. Showerhead body 262 has a showerhead chamber 263 formed therein and a plurality of nozzles 264 communicating with showerhead chamber 263. The showerhead chamber 263 is filled with a conductive paste 250. The conductive paste 250 is applied to the substrate through the nozzle 264.
EXAMPLE III
In this example, the solar cell manufacturing system of example two was used to coat a conductive paste on a solar cell substrate.
In the present embodiment, the extrusion injection system 200 is fixed and the stage 500 is moved, so that the conductive silver paste (conductive paste 250) is coated on a predetermined position of the silicon wafer (substrate 600).
Firstly, the conductive silver paste is put into a defoaming machine, stirred and defoamed, and bubbles in the paste are removed. Conductive silver paste is carefully filled into the syringe injector 240 using auxiliary equipment and placed into the extrusion injection system 200 in connection with the multi-port nozzle 260.
The silicon wafer is placed on the carrier 500 and fixed. The carrier 500 and the support device 300 are moved to an intermediate position. The angle of the multi-nozzle 260 and the height of the carrier 500 are adjusted so that the height of the outlet of the nozzle 264 is 1-3mm above the silicon wafer. In the control system 100. Moving the carrier 500 to the front, starting the extruding device to extrude part of the conductive paste 250, removing the redundant air inside the multi-nozzle 260, and wiping the residual conductive paste at the outlet of the nozzle 264.
The control system 100 is turned on. Set the extrusion injection system 200: and (4) zeroing the current position, and setting the progress and speed of extrusion. Setting the stage 500: inputting the starting position and the stopping position, and setting the moving speed of the carrier. Setting the supporting device 300: the supporting device is fixed in position. And starting a coating program, and directly extruding the conductive silver paste onto the silicon chip to form a plurality of grid lines. The diameter of the wire is related to the diameter of the nozzle 264, the speed of the screw 230, and the moving speed of the stage 500. And after the whole operation process is finished, drying and sintering are carried out, and subsequent analysis is carried out.
Claims (10)
1. A solar cell preparation system is characterized by comprising an extrusion injection system, a carrying platform system and a supporting and moving system;
the extrusion injection system comprises an injection device, a spray head and an extrusion device, wherein the injection device is used for containing the conductive paste, the spray head comprises one or more nozzles, the spray head is directly connected with the injection device, and the extrusion device is used for pressurizing the conductive paste in the injection device to extrude the conductive paste to a preset area on a base material through the nozzles of the spray head;
the stage system comprises a stage for carrying a substrate;
the supporting and moving system is used for supporting the extrusion injection system and enabling the spray head and the carrier to generate relative displacement, and comprises a first moving device used for enabling the spray head to move and/or a second moving device used for enabling the carrier to move.
2. The solar cell preparation system of claim 1, wherein the solar cell preparation system has one or more of the following characteristics:
the extrusion device comprises a screw extrusion device and/or a piston extrusion device;
the extrusion injection system and/or the carrying platform system comprise a temperature adjusting device for adjusting the temperature of the conductive paste;
the angle of the spray head relative to the base material can be adjusted;
the nozzle has a flat opening.
3. The solar cell preparation system of claim 1, further comprising a control system for controlling the operation of the extrusion injection system and the support and movement system.
4. The solar cell production system of claim 1, further comprising a UV system for UV curing the conductive paste on the substrate; and/or the solar cell preparation system further comprises a thermal drying system for thermally drying the conductive paste on the substrate.
5. The solar cell preparation system of claim 1, wherein the support and movement system comprises an H-shaped support frame comprising two vertical bars and a cross bar spanning between the two vertical bars, the extrusion injection system being secured to the cross bar of the H-shaped support frame, the cross bar of the H-shaped support frame being movable up and down the vertical bars.
6. The solar cell preparation system of claim 5, wherein the support and movement system further comprises two slide rails and two sliders respectively associated with the two slide rails, the two sliders being respectively connected to the bottom of the two vertical rods of the H-shaped support frame.
7. The solar cell preparation system of claim 1, wherein the support and movement system comprises one or more slide rails cooperating with the stage for enabling movement of the stage along the slide rails.
8. The solar cell preparation system of claim 1, wherein the extrusion injection system comprises a back plate, a motor, a screw, a syringe injector and a spray head, the extrusion injection system is connected with the support and movement system through the back plate, the motor is used for rotating the screw, the syringe injector comprises a syringe for containing the conductive paste and a piston for pressurizing the conductive paste, the screw is connected with the piston of the syringe injector, the bottom of the syringe injector is provided with a paste outlet, and the spray head is connected with the paste outlet.
9. The solar cell preparation system of claim 1, wherein the spray head is a multi-port spray head, the multi-port spray head comprises a connection port, a spray head entity, a spray head cavity and a nozzle, the multi-port spray head is connected to the slurry outlet at the bottom of the injection device through the connection port, and the spray head entity is internally provided with the spray head cavity for containing the conductive slurry and the nozzles communicated with the spray head cavity.
10. A method for manufacturing a solar cell, comprising manufacturing a solar cell using the solar cell manufacturing system according to any one of claims 1 to 9.
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| US20050221613A1 (en) * | 2004-04-06 | 2005-10-06 | Sharp Kabushiki Kaisha | Electrode formation method, electrode and solar battery |
| JP2011201055A (en) * | 2010-03-24 | 2011-10-13 | Panasonic Corp | Device and method for printing screen |
| CN103456835A (en) * | 2013-07-31 | 2013-12-18 | 华中科技大学 | Device and method for preparing gate electrodes of solar cell |
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| CN106653877A (en) * | 2016-12-14 | 2017-05-10 | 大连理工大学 | E-jet printing method for solar photovoltaic cell electrode |
| CN111315496A (en) * | 2017-11-02 | 2020-06-19 | 武藏工业株式会社 | Liquid material coating device and coating method |
| CN111907059A (en) * | 2019-05-08 | 2020-11-10 | 高雄科技大学 | Laminated forming system |
| CN110233181A (en) * | 2019-06-24 | 2019-09-13 | 大连理工大学 | A kind of device homogenizing direct write electrode of solar battery |
| CN112917893A (en) * | 2021-01-20 | 2021-06-08 | 青岛理工大学 | Micro-nano 3D printing device for single-plate electrode electric field driven jet deposition |
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