Method for preparing solar cells
A technology of solar cells and silicon wafers, applied in circuits, electrical components, photovoltaic power generation, etc., can solve problems such as the height difference of the aluminum back field and affect the welding of the ribbon, so as to reduce the height difference, facilitate the welding process, and improve infrared welding The effect of craft
Active Publication Date: 2018-11-13
CSI CELLS CO LTD +1
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Problems solved by technology
[0003] The technical problem solved by the present invention is to provide a method for preparing solar cells, 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
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[0027] see figure 1 Shown, the present invention provides a kind of preparation method of solar cell, comprising:
[0028] S101: preparing a back electrode on the back of the silicon wafer;
[0029] 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 In the structure shown, the steel wire mesh 20 is provided with openings 21 .
[0030] S102: preparing an aluminum back field and a positive electrode;
[0031] In the embodiment of the present application, the aluminum paste is printed on the back of the silicon wafer 10 by screen printing, that is, through the opening 21 of the steel mesh 20, the aluminum paste is brushed to the area other than the back electrode 11, so that An aluminum back field 13 is formed around the back electrode 11, such as image 3 shown. Of course, in order to avoid brushing the aluminum pa...
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Abstract
The present invention provides a preparation method of a solar cell. The preparation method comprises the following steps of preparing a back electrode on the reverse side of a silicon slice; preparing an aluminum back field and a positive electrode; setting a solder paste layer on the back electrode; heating the back electrode and the solder paste layer to combine the back electrode and the solder paste layer. According to the present invention, after the aluminum back field and the positive electrode are prepared, the solder paste layer is printed on the surface of the back electrode, so that the height difference between the back electrode and the aluminum back field can be reduced substantially, the problem that the contact of a solder strip and the back electrode is poor due to the height difference is avoided, and a soldering technology of the back electrode and the solder strip is more convenient. Meanwhile, with the arrangement of the solder paste layer, the tin content between the solder strip and the back electrode is increased, and an infrared soldering technology of the fine solder strip can be improved.
Description
【Technical field】 [0001] The invention relates to a solar cell manufacturing technology, in particular to a method for preparing a solar cell sheet. 【Background technique】 [0002] 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, the multi-busbar battery...
Claims
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IPC IPC(8): H01L31/18H01L31/0224H01L31/0216
CPCH01L31/02167H01L31/022425H01L31/1804Y02E10/547Y02P70/50
Inventor 吴艳芬琚晨辉王栩生
Owner CSI CELLS CO LTD