Polycrystalline silicon etching solution in solar cell and polycrystalline silicon etching process

Abstract

The invention relates to a polycrystalline silicon etching wafer solution in a solar cell. The solution is characterized by comprising the following components in parts by weight: 6 to 7 parts of hydrofluoric acid, 64 to 68 parts of nitric acid, and 26 to 28 parts of deionized water. An etching process of the polycrystalline silicon in the solar cell is characterized by comprising the following steps: injecting the deionized water into an etching tank; slowly pouring the hydrofluoric acid into the etching tank along the etching tank wall; slowly pouring the nitric acid into the etching tank along the etching tank wall; starting a cooling system of the etching tank to circularly cool a liquid in the etching tank for 10 to 15 minutes until the temperature of the liquid in the etching groove to be between 4 and 8 DEG C to obtain etching solution; and etching a polycrystalline silicon wafer in the etching solution for 280 to 320 seconds. According to the polycrystalline silicon wafer etching solution, the etching time is shortened; the polycrystalline etching effect is improved; the texture of the silicon wafer is uniform, fine and constant, the surface is clean, has good accordance without black lines; and the conversion efficiency and the quality of a solar cell are improved.

Description

technical field [0001] The invention relates to a polysilicon etching liquid and a polysilicon etching process in a solar cell, in particular to an etching liquid and a texturing process used in the texturing process in the polysilicon solar cell manufacturing process, and belongs to the field of photovoltaic technology. Background technique [0002] As one of the new and renewable energy sources, one of the five most decisively influential technical fields in the economic outlook of the 2000s, solar power generation is environmentally friendly, energy-saving, efficient, inexhaustible, and inexhaustible. It has become the most attention-grabbing energy among new energy sources. Therefore, focusing on strengthening the research and development of photovoltaic industries such as solar cells, continuously improving photoelectric conversion efficiency, and reducing costs have become the key for enterprises to win in the fierce market competition in the future, continuously prom...

AI Technical Summary

Problems solved by technology

However, due to the quality problems of the silicon wafer itself and the limitations of the trough-type texturing equipment, etc., the texturing process has brought a lot of troubles, such as shiny surface, dirty surface, black lines on the surface, etc., which make the production It cannot operate normally, the color difference of the produced cells is serious, the conversion efficiency is low, and the pass rate of the product is not high