Corrosion method for germanium substrate sheet of solar battery

Abstract

The invention discloses a corrosion method for germanium substrate sheet of solar battery, comprising the following steps of: preparing No.1 corrosion liquid medicine by 1200-1300ml of pure water and 140-150ml of hydrofluoric acid with mass concentration of 48-50%, orderly placing the germanium sheet in a clamping plug, showering the clamping plug with the pure water and then dipping the clamping plug into the No.1 corrosion liquid medicine, shaking the clamping plug, after corroding the germanium sheet for 7-10 seconds, taking out the germanium sheet, quickly placing the germanium sheet into a pure water tank for washing, and showering the germanium sheet with the pure water; preparing a No.2 corrosion liquid medicine by 150-160ml of glacial acetic acid with mass concentration of not less than 99.7%, 3-5ml of bromine water with mass concentration of 99.5% and 250-260ml of hydrogen nitrate with mass concentration of 98%; dipping the clamping plug with the germanium sheet into the No.2 corrosion liquid medicine, shaking the clamping plug, taking out the germanium sheet after corroding for 20-30 seconds, placing the germanium sheet into the pure water tank for washing, showering the germanium sheet with the pure water, and finally, placing the clamping plug and the germanium sheet into a flowing water tank. By corrosion according to the method provided by the invention, the strength of the germanium sheet is enhanced, the strength is more than 18bf, and the breakage rate of the germanium sheet is greatly reduced.

Description

technical field

[0001] The invention relates to a germanium substrate sheet of a solar cell, in particular to an etching process for a solar germanium substrate sheet. Background technique

[0002] my country is currently the world's largest producer and exporter of germanium, but the overall technical level of the germanium industry is not high, causing serious waste of resources, and the germanium substrate materials currently used in my country are almost imported. For space solar cells, the thickness requirements, electrical properties and mechanical properties of solar germanium substrates will become higher and higher in the future. As an indispensable process for the processing of germanium single crystal materials, chemical corrosion plays an important role in the quality of germanium products. In the future, the thickness of the germanium sheet can even reach about 120 μm. If such a thin germanium sheet wants to achieve high strength and reduce the problem of high d...

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