Preparation method of solar cell and solar cell

Abstract

The invention provides a preparation method of a solar cell and the solar cell, and relates to the technical field of solar photovoltaics. According to the method, one-time wet etching and multiple times of laser ablation are adopted in the process of conducting emitting electrode and back surface field patterning on the back face of the silicon substrate, the laser ablation technology is high in machining speed, high in precision, low in cost and small in pollution, and therefore the number of times of wet etching which is tedious in implementation operation, high in cost and large in pollution is reduced, and the yield of the silicon substrate is improved. By adopting laser ablation, the process can be effectively simplified, the cost can be reduced, the patterning precision can be improved, the damage can be reduced, and the finished product quality of the HBC battery can be improved.

Description

technical field [0001] The present invention relates to the technical field of solar photovoltaic, in particular to a preparation method of a solar cell and a solar cell. Background technique [0002] Silicon Hetero-Junction (SHJ) cells are prepared by depositing intrinsic hydrogenated amorphous silicon on the surface of crystalline silicon to passivate surface defects, and then depositing doped hydrogenated amorphous silicon films. junction, SHJ cells have symmetrical structure, high open circuit voltage, low process temperature, good temperature characteristics, stable illumination and high bifacial ratio. Further, in order to improve the short-circuit current of the SHJ battery, a back-contact heterojunction (HBC) battery can be used. The HBC battery adopts an interdigital arrangement on the back side and an electron collection layer and a hole collection layer are arranged at the same time, so that the two types of collection layers are arranged. The layers are arranged...

AI Technical Summary

Problems solved by technology

[0003] At present, photolithography, screen printing, masking, masking and other processes are usually used to prepare two kinds of interdigitated collection layers on the back of the HBC battery. Most processes require at least two placement of masks, or at least two wet methods Etching different graphics makes the operation of using masks and etching solutions complicated and expensive. At the same time, there may also be problems of low alignment accuracy and large damage, which affects the quality of finished products

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