Chromogenic solution and method for distinguishing P/N-type silicone materials

Abstract

The invention discloses chromogenic solution and a method for distinguishing P / N-type silicone materials. The chromogenic solution comprises nitric acid and hydrofluoric acid in a volume ratio of 1: 80-120, wherein hydrofluoric acid accounts for 40 to 45 mass percent and the nitric acid accounts for 65 to 68 percent. The N-type electronic conductive silicon material washed by using the chromogenic solution is bright and the P-type hollow conductive silicon material washed by using the chromogenic solution is dark gray, so that the advantages that the P / N-type silicone materials are easy to wash and sort are achieved. The brightness and the darkness on the surface of an amorphous silicon material pickled by the chromogenic solution of the invention are in sharp contrast; the P type silicone material and the N type silicone material can be seen by naked eyes clearly; furthermore, the used acidic solution can be recycled for washing impurities on the surface of the silicon material. Moreover, the chromogenic solution has the advantages of enhancing distinguishing rate, improving work efficiency, promoting monocrystal quality and reducing cost.

Description

technical field [0001] The invention relates to a detection technology for semiconductor silicon materials, in particular to a color developing solution and a method for distinguishing P / N type silicon materials. Background technique [0002] The development of the photovoltaic industry in recent years has proved that monocrystalline silicon solar cells are one of the most important green energy sources for human beings in the future. Silicon single crystal with high-quality parameters is the basic condition for the production of high-efficiency solar cells. The existing chromogenic solution for sorting silicon materials can only distinguish low-concentration doped qualified silicon materials and high-concentration doped unqualified silicon materials, and cannot be used to distinguish P-type and N-type silicon materials; for example, Chinese Patent Publication No. CN101021481A discloses a chromogenic solution for detecting and sorting waste silicon materials, which belongs ...

AI Technical Summary

Problems solved by technology

The existing chromogenic solution for sorting silicon materials can only distinguish low-concentration doped qualified silicon materials and high-concentration doped unqualified silicon materials, and cannot be used to distinguish P-type and N-type silicon materials; for example, Chinese Patent Publication No. CN101021481A discloses a color-developing solution for detecting and sorting waste silicon materials, which belongs to the above-mentioned situation

[0003] In the existing process, it is a cumbersome task to test the conductivity type of a small piece of silicon material. If it is not tested and directly purified and re-pulled, it will affect the important quality parameter of the single crystal-lifetime, but if it is tested piece by piece, a day Only one kilogram of polysilicon material can be detected at most, and the efficiency is extremely low