Post-cleaning technology applied to texture surface making for solar cell

Abstract

The invention relates to the technical field of solar cells, in particular to a post-cleaning technology applied to texture surface making for the solar cell. The post-cleaning technology comprises the following steps: firstly, rinsing a monocrystalline silicon wafer subjected to pre-cleaning and texture surface making with pure water and cleaning in a post-cleaning solution; secondly, carrying out pure water rinsing and then acid pickling, washing and drying; thirdly, carrying out phosphorus diffusion, etching, PECVD and silk-screen printing to obtain a finished product of a monocrystalline silicon solar cell. According to the post-cleaning technology applied to the texture surface making for the solar cell, disclosed by the invention, organic matters in an additive are oxidized, and organic matters adsorbed to the surface of the silicon wafer are removed, so that the surface of the silicon wafer can be cleaned in the subsequent acid pickling process and the problems of poor appearance and the like are solved; after being cleaned with hydrofluoric acid, the wafer surface is transformed from OH passivation to H passivation so as to realize the aim of surface hydrophobicity; the silicon wafer is dehydrated more thoroughly, and the problem of excessively-long drying time is solved; and a textured structure is optimized, the emissivity is reduced, short-circuit current is improved, the surface recombination center is reduced and open circuit voltage is improved.

Description

technical field [0001] The invention relates to the technical field of solar cells, in particular to a post-cleaning process applied to the texturing of solar cells. Background technique [0002] In the manufacturing process of solar cells, the texturing process is an extremely important link. The specific technological process of the texturing process is as follows: ① Pre-cleaning: the purpose is to remove the mechanically damaged layer on the surface of the original silicon wafer and the impurities adsorbed on the surface of the original silicon wafer, and pre-treat the surface of the silicon wafer to make the texture of the textured surface uniform. sex. ② Texturing: Due to the anisotropic corrosion characteristics of low-concentration alkali on the surface of silicon wafers, the pyramid structure formed by corroding (111) crystal planes on silicon (100) crystal planes with low-concentration alkalis increases the size of the structure. The specific surface area of ​​the...

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the problem of poor removal and improvement effect of the post-cleaning process of traditional solar cell texturing, the present invention provides a post-cleaning process for solar cell texturing with improved texture structure and good removal effect, thereby reducing the reflectivity, Effectively increase the open circuit voltage and short circuit current to improve the efficiency of solar cells