Method for effectively controlling diamond wire wet chemical black silicon battery piece EL poor performance

Abstract

The invention discloses a method for effectively controlling diamond wire wet chemical black silicon battery piece EL poor performance. The method comprises the following steps of 1) texturing: performing damage layer removal, silver deposition, hole digging, primary silver removal and hole expansion on an original silicon wafer (water rinsing is carried out in all the steps), and carrying out solution processing, wherein the solution is an acidic mixed solution composed of hydrochloric acid and water, and the volume ratio of hydrochloric acid to water in the mixed solution is 1:6 to 1:1, theconcentration of hydrochloric acid is 36%-38%, and the weight reduction of the wet-process black silicon texturing silicon wafer is controlled to be 0.35g to 0.45g; 2 ) performing a diffusion processof a normal production line process and then carrying out processing in the normal production line process, namely, sequentially carrying out diffusion, PSG removal, etching, PECVD film coating, screen printing and testing. By virtue of the method for effectively controlling diamond wire wet chemical black silicon battery piece EL poor performance provided by the invention, the low efficiency proportion of battery piece quantity production can be lowered.

Description

technical field [0001] The invention relates to the technical field of polycrystalline silicon solar cell production, in particular to a method for effectively controlling the EL failure of diamond wire wet chemical black silicon cells. Background technique [0002] In the photovoltaic industry, with the continuous development and innovation of technology, in the texturing process, the wet chemical method of manufacturing diamond wire-cut black silicon textured surface has achieved mass production. The wet chemical method is also called MCCE (Metal Catalyzed Chemical Etching). It means the metal-catalyzed chemical corrosion method. Using this method to manufacture nano-scale black silicon texture requires the use of heavy metals as catalysts; however, if the metal remains on the surface of the silicon wafer during the black silicon texture production process, it will inevitably cause metal pollution. As a result, the efficiency of the battery sheet is low, and electrolumines...

AI Technical Summary

Problems solved by technology

[0002] In the photovoltaic industry, with the continuous development and innovation of technology, in the texturing process, the wet chemical method of manufacturing diamond wire-cut black silicon textured surface has achieved mass production. The wet chemical method is also called MCCE (Metal Catalyzed Chemical Etching). It means the metal-catalyzed chemical corrosion method. Using this method to manufacture nano-scale black silicon texture requires the use of heavy metals as catalysts; however, if the metal remains on the surface of the silicon wafer during the black silicon texture production process, it will inevitably cause metal pollution. As a result, the efficiency of the cell is low, and electroluminescence (English electroluminescent), also known as electric field luminescence, referred to as EL

"Tortoise crack" is the EL photographed image of the wet-process black silicon cell, which has an image similar to the stripe structure of the turtle's back shell. The opening voltage and short current of this type of cell are lower than normal cells, so the efficiency is low

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