A kind of manufacturing method of p-type solar cell by laser optimized winding plating

Abstract

The invention discloses a method for manufacturing a P-type solar cell through laser optimization winding plating. The method comprises the steps of texturing, diffusion, polishing, annealing, back passivation film preparation, front passivation film preparation, back laser grooving, silk-screen printing, sintering and photoinduced regeneration. The method is characterized in that a laser processing step is added after the step of back passivation film preparation and before the step of front surface passivation film preparation; a laser processing process is carried out on the front surface of a silicon wafer; and a laser processing area is an area between a front surface silk-screen printing frame line of the silicon wafer and a silicon wafer frame. According to the invention, a procedure of processing a front frame by laser is added; a redundant silicon nitride film layer wound on the front during back film coating is eliminated; the laser processing area is located outside the silk-screen printing frame, so that the electrical performance of a battery piece is not influenced; the difference of the inner film colors of the front piece of the battery piece after laser processingis reduced, so that the inner film colors of the front piece of the prepared battery piece are uniform; the requirement of the a back backboard assembly on the film colors of the battery piece is met;and the appearance yield of the battery piece for the black backboard assembly is improved.

Description

technical field [0001] The invention relates to the technical field of solar cells, in particular to a method for manufacturing a P-type solar cell with laser optimized winding plating. Background technique [0002] A solar cell is a semiconductor device that directly uses sunlight to generate electricity. Its main principle is to use the photovoltaic effect to convert light energy into electrical energy. When light of a certain energy is irradiated on the P-N junction, hole-electron pairs are excited. , under the action of the built-in electric field, the holes and electrons will flow to both ends of the battery respectively. At this time, the holes in the N-type region flow to the P-type region, and the electrons in the P-type region flow to the N-type region. create a current. The traditional P-type solar cell manufacturing steps are: [0003] 1. Silicon wafers are polished to remove surface defects; [0004] 2. Texturing: Texturing forms a light-trapping pyramid; [...

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Problems solved by technology

[0016] The technical problem to be solved by the present invention is: the film color unevenness of the finished battery sheet produced by the prior art is very obvious on the black back plate assembly, which seriously affects the appearance yield

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