Method for manufacturing back electrode of CdTe solar cell

Abstract

The invention provides a method for manufacturing a back electrode of a CdTe solar cell, and the method is characterized in that a laser with three laser head arrays is used for simultaneously etching lines on a CdTe light absorption layer of a CdTe thin film cell semi-finished product structure; a bottom electrode, a buffer layer and the light absorption layer are etched by the laser of a first laser head, and the buffer layer and the light absorption layer are etched by the laser of a second laser head and a third laser head; the three laser head arrays work at the same time, and the whole film layer is divided into a plurality of battery units; silk-screen printing is performed on low-temperature curing insulation paste in the first and third laser head scribing areas, and the low-temperature curing insulation paste is put in the first and third laser head scribing grooves; silk-screen printing is performed on the low-temperature curing conductive slurry to form a back electrode grid line grid, back electrode grid lines are kept away from a third laser head scribing area, and curing is performed to obtain the back electrode of the solar cell. The method simplifies the technological process, reduces the environmental protection pressure, remarkably reduces the cost in the technological process, and improves the yield.

Description

Technical field [0001] The present invention belongs to the field of photovoltaic cells, and in particular, the present invention relates to a method of making a back electrode for a CDTE solar cell. Background technique [0002] Cadmium telluride solar cells are a thin film solar cell based on the heterojunction of P-type CDTE and N-type CDS / CDSE, which is easy to make, low cost and weight, and so on. The production cost of the cadmium telluride thin film solar cell is much lower than the solar cell technology of crystalline silicon and other materials. Second it is consistent with the sun spectrum, absorbs more than 95% of the sunshine. During the size of the CDTE solar cell, the multi-layer membrane structure cutting and metallization of the metal is needed to form a multi-battery sheet series structure assembly, and the cutting is achieved by multiple laser engraved processing, and solar energy is easily occurring during processing. The non-straightness of the thin film bat...

AI Technical Summary

Problems solved by technology

[0003] In view of the above-mentioned shortcomings of the prior art, the purpose of the present invention is to provide a method for manufacturing the back electrode of a CdTe solar cell, which is used to solve the problems of lengthy and complicated laser scribing procedures and a large amount of waste of photoresist in the prior art

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