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Solar battery cell and fabrication method thereof

A technology for solar cells and silicon wafers, applied in the field of solar cells and its preparation, can solve the problems of aluminum back field height difference and influence on ribbon welding, etc., achieve the goals of reducing height difference, convenient welding process, and improving infrared welding process Effect

Inactive Publication Date: 2017-01-11
CSI CELLS CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem solved by the present invention is to provide a solar battery sheet and its preparation method, which can improve the problem in the prior art that there is a height difference between the aluminum back field and the back electrode, which affects the welding of the ribbon

Method used

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  • Solar battery cell and fabrication method thereof
  • Solar battery cell and fabrication method thereof
  • Solar battery cell and fabrication method thereof

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Embodiment Construction

[0031] see figure 1 Shown, the present invention provides a kind of preparation method of solar cell, comprising:

[0032] S101: preparing a back electrode on the back of the silicon wafer;

[0033] In this application, the back electrode 11 is produced by screen printing, and the silver paste (Ag) is printed on the back side of the silicon wafer 10 through a steel mesh 20, and then dried to form a figure 2 structure shown.

[0034] S102: setting a solder paste layer on the back electrode;

[0035] In a preferred embodiment of the present application, the solder paste layer 12 is printed on the surface of the back electrode 11 through the opening 21 on the steel mesh 20, which can be referred to image 3 As shown, wherein, the thickness of the steel mesh 20≦0.10mm, and the size of the opening 21 corresponding to the back electrode 11 on the steel mesh 20 is 40% to 90% of the size of the back electrode 11, which refers to the size of the area , that is, the solder paste la...

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Abstract

The invention provides a solar battery cell and a fabrication method thereof. The fabrication method comprises the steps of fabricating a back electrode on a back surface of a silicon wafer; arranging a tin paste layer on the back electrode; heating the back electrode and the tin paste layer to make the back electrode and the tin paste layer combined; and fabricating an aluminum back field and a positive electrode. The tin paste layer is additionally arranged on the surface of the back electrode, thus, the height difference between the back electrode and the aluminum back field is greatly eliminated, the problem of unfavorable contact of a welding strip and the back electrode caused by the height difference is prevented, and the welding process of the back electrode and the welding strip is more convenient; and meanwhile, with the arrangement of the tin paste layer, the tin content between the welding strip and the back electrode is increased, and an infrared welding process of a fine welding strip can be improved.

Description

[0001] 【Technical field】 [0002] The invention relates to solar cell manufacturing technology, in particular to a solar cell sheet and a preparation method thereof. [0003] 【Background technique】 [0004] In the manufacturing process of solar cells, the positive electrode and the back electrode are mainly prepared on the front and back sides of the silicon wafer by screen printing. However, with the improvement of solar cell technology, crystalline silicon solar cells have changed from the original two main The four busbar lines developed so far, the increase of busbar lines can not only greatly reduce the shading of the grid lines on the battery, reduce the unit consumption of Ag paste in the battery manufacturing process, and reduce the production cost of the battery; it can also shorten the current on the thin grid The transmission distance to the main grid reduces the series resistance of the battery, thereby improving the conversion efficiency of the battery. However, t...

Claims

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Application Information

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IPC IPC(8): H01L31/0224H01L31/068H01L31/18
CPCH01L31/022441H01L31/0682H01L31/1804Y02E10/547Y02P70/50
Inventor 吴艳芬琚晨辉王栩生
Owner CSI CELLS CO LTD
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