A method for slicing heterojunction shingled solar cells

Abstract

The invention discloses a method for slicing heterojunction shingled solar cells, which comprises the following steps: depositing a thin intrinsic amorphous silicon layer and an n-type amorphous silicon layer on one side of an n-type silicon wafer, and depositing a thin intrinsic amorphous silicon layer on the other side. sign amorphous silicon layer and p-type amorphous silicon layer, and deposit conductive film layer on n-type amorphous silicon layer and p-type amorphous silicon layer; Print etching paste on the conductive film layer; bake the n-type silicon wafer printed with etching paste, clean and remove the amorphous silicon layer and conductive film layer in the area printed with etching paste on the n-type silicon wafer; conduct electricity on the n-type silicon wafer A metal grid line electrode is formed on the film layer; several equal small pieces of n-type silicon wafers are cut by laser in the n-type silicon wafer cutting area. The invention uses printing to print etching paste on the double-sided edge and cutting area of ​​the n-type silicon wafer, removes the amorphous silicon layer and the conductive film layer, improves the performance and reliability of the heterojunction shingled solar cell, and has a simple process , conducive to large-scale automated production.

Description

technical field [0001] The invention relates to the technical field of solar cell manufacturing, in particular to a slicing method for heterojunction shingled solar cells. Background technique [0002] Shingled solar module is a kind of small battery that cuts traditional solar cells into more than 2 pieces. The front main grid and the back electrode of two adjacent battery cells overlap, and then they are connected in series with a special material similar to conductive glue. Form a long battery string together, and connect multiple battery strings in series and parallel to form a high-density solar module technology. This kind of solar shingled module improves the uniformity of current density and reduces the current transmission impedance, thereby reducing the internal power consumption of the module. At the same time, the innovative string arrangement reduces the conventional inter-sheet spacing and increases the light-receiving area, so it can Improve the power generat...

AI Technical Summary

Problems solved by technology

[0003] The processing temperature of all processes of heterojunction solar cells is lower than 250°C. If the temperature is too high, the amorphous silicon layer of heterojunction solar cells will be destroyed, which will affect the performance of solar cells.

After the heterojunction cell is cut by laser, the laser generates local high temperature, the amorphous silicon layer at the edge of the laser cutting is damaged, the leakage current of the small cell after cutting increases, and the fill factor decreases, which affects the efficiency and efficiency of the shingled module. stability

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