Polycrystalline velvet additive-matched surface treatment technology after felting

Abstract

The invention discloses a polycrystalline velvet additive-matched surface treatment technology after felting. The technology comprises the following steps: (a) putting a silicon slice into a system to which a novel polycrystalline velvet additive is added to felt, so as to form a small suede with a better anti-reflection effect; (b) heating a KOH solution to an alkaline bath by using a heat exchanger with large powder, and then spraying the felted silicon slice up and down by using a hot alkaline liquor; (c) cleaning the surface of the silicon slice by using specific concentration of HF / HCL mixed acid. By adopting the technology disclosed by the invention, excessive nanoscale porous silicon can be removed, recombination is effectively reduced, open pressure and parallel resistance are improved, leakage current is reduced, and an aluminum back field also can be effectively prevented from loosening and falling off after a silk screen is printed and sintered. The capillarity on the suede is relieved due to higher concentration of hot alkaline washing, a pile pit is better in homogeneity, the probability of over-etching and P aberration of a pipe is finally reduced, and impurities in the pile pit of the small suede are removed by higher concentration of mixed acid washing. Thus, recombination is greatly reduced.

Description

Technical field: [0001] The invention relates to the field of solar cell preparation, in particular to a surface treatment process after texturing matched with polycrystalline texturing additives. Background technique: [0002] At present, the efficiency requirements of crystalline silicon solar cells are getting higher and higher. As a new type of product that can effectively reduce the reflectivity and increase the short-circuit current and have a certain gain after the module manufacturing process, the polycrystalline texturing additive has a higher return on investment. It has gradually been tried and even mass-produced by major manufacturers. However, the traditional process of polycrystalline texturing additives has disadvantages such as unclean removal of porous silicon, high proportion of etching over-etch / pipe P color difference, and unclean cleaning of impurities in the deep pits. These problems eventually lead to the degradation of battery efficiency and quality. ...

AI Technical Summary

Problems solved by technology

However, the traditional process of polycrystalline texturing additives has disadvantages such as unclean removal of porous silicon, high proportion of etching over-etch / pipe P color difference, and unclean cleaning of impurities in the deep pits. These problems eventually lead to the degradation of battery efficiency and quality. decline