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Generation method for solar battery conductive electrode

A technology of solar cells and conductive electrodes, applied in circuits, electrical components, semiconductor devices, etc., can solve the problems of metal or metal alloy budding, solar cell bending, uneven thermal stress, etc., to increase the specific surface area and release thermal stress , the effect of increasing the contact area

Active Publication Date: 2010-05-12
WUXI SUNTECH POWER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In order to overcome the problems caused by the bending of solar cells after sintering in the prior art, one of the purposes of the present invention is to provide a method for generating conductive electrodes of solar cells, which can reduce the amount of conductive paste used and reduce production costs. At the same time, it can effectively solve the problem of budding and beading of metal or metal alloy
[0009] Another object of the present invention is to provide a method for generating conductive electrodes of solar cells, which further solves the bending problem caused by uneven thermal stress caused by doped glass

Method used

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  • Generation method for solar battery conductive electrode
  • Generation method for solar battery conductive electrode
  • Generation method for solar battery conductive electrode

Examples

Experimental program
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Effect test

Embodiment 1

[0044] The stencil used for screen printing silver conductive paste for solar cells, in the area where the silver conductive paste is directly printed, some parts are covered with photosensitive adhesive film. The shape of the portion covered by the photosensitive adhesive film is circular. The diameter of the circles is 80 microns, and the center-to-center spacing between the individual circles is 300 microns. After the silver conductive paste is screen-printed on the surface of the solar cell through the screen, the thickness of the thinnest part of the silver conductive paste is measured to be 10 microns, and the thickness of the thickest part is 11 microns. After the stencil was used 5000 times, it was found that part of the photosensitive adhesive film fell off. The curvature of the solar cell is 0.5 mm.

Embodiment 2

[0046] The stencil used for screen printing silver-aluminum conductive paste for solar cells, in the area where the silver-aluminum conductive paste is directly printed, some parts are covered with a photosensitive adhesive film. The shape of the part covered by the photosensitive adhesive film is a rectangle. The sides of the rectangle The length is 80 microns*120 microns, and the distance between the centers of each rectangle is 300 microns and 200 microns respectively. After the silver-aluminum conductive paste is screen-printed on the surface of the solar cell through the screen, the thinnest silver-aluminum conductive paste is measured. The thickness of the stencil is 15 microns, and the thickest part is 30 microns. After 15,000 uses of the stencil, it was found that part of the photosensitive adhesive film fell off. The bending degree of the solar cell was 1.0 mm.

Embodiment 3

[0048] The stencil used for screen printing aluminum conductive paste for solar cells, in the area where the aluminum conductive paste is directly printed, some parts are covered with photosensitive adhesive film. The shape of the photosensitive adhesive film covering part is hexagonal. The distance from the center of the hexagon to the corner point is 150 microns, and the center-to-center spacing between the individual hexagons is 350 microns. After the aluminum conductive paste is screen-printed on the surface of the solar cell through the screen, the thickness of the thinnest part of the aluminum conductive paste is 5 microns, and the thickest part is 20 microns. After the stencil was used 50,000 times, it was found that part of the photosensitive adhesive film fell off. The curvature of the solar cell is 0.7 mm.

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Abstract

This invention discloses a method for generating conduction electrodes of solar cells, which prints conductive slurry to poles of type-N and type-P of a solar cell with a halftone by a silk screen printing technology characterizing that said conduction slurry for screen plate printing is covered with sensitive cellophane and rule or ruleless rugged surfaces appearing on the surface of a conductiveelectrode with this method can stop getting together to a point by melt metals effectively, and metal balls or buds will not be generated on the surface of the conductive electrode even if the thickness of the back conductive electrode is reduced so as to reduce warp of solar cells.

Description

technical field [0001] The invention relates to the preparation technology of semiconductor solar cells, in particular to the generation method of conductive electrodes of crystalline silicon solar cells. Background technique [0002] The traditional method of producing crystalline silicon (single crystal silicon or polycrystalline silicon) solar cells is to first diffuse the P-type single crystal silicon wafer or polycrystalline silicon wafer after the damaged layer is removed, thereby forming a P-N junction. The surface close to the P-N junction is usually called the upper surface, or the emitter. In order to reduce the reflectivity, a layer of anti-reflection film will be coated on the upper surface of the solar cell. The other side corresponding to the upper surface is called the back surface. In order to make a crystalline silicon wafer a solar cell, conductive electrodes must be plated on its front and back surfaces, respectively. The function of the conductive elec...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01L31/18
CPCY02P70/50
Inventor 季静佳施正荣李华
Owner WUXI SUNTECH POWER CO LTD