Manufacture method of solar silicon single crystal

Abstract

The invention relates to a preparation method of a solar silicon single crystal and aims to provide an improvement of the preparation method of the solar silicon single crystal. The improved preparation method saves resources, reduces production cost and improves economic benefit, and simultaneously, the solar silicon single crystal prepared by using the preparation method also has good cleanability and safety, long service life and favorable product performance. The technical proposal is as follows: the manufacture method of the solar silicon single crystal is characterized by using discarded leftovers of polysilicon as the raw material to prepare the solar silicon single crystal, and includes: step 1. firstly classifying the leftovers of polysilicon; and step 2. putting the leftovers into a crucible to be drawn.

Description

technical field [0001] The invention relates to a method for preparing solar silicon single crystals, in particular to a method for preparing solar silicon single crystals by using waste polysilicon leftovers. Market demand for solar-grade silicon monocrystalline for batteries. Background technique [0002] At present, solar photovoltaic power generation plays an important role in renewable energy. Photovoltaic energy is considered to be the most important energy source in the 21st century. Because photovoltaic power generation has incomparable advantages: cleanliness, safety, universality, and long life , Maintenance-free, practical, resource adequacy and potential economy. [0003] Czochralski silicon single crystal is the most basic material for manufacturing semiconductor devices such as large-scale integrated circuits, and is also an important material for solar cells. At present, the raw materials used by manufacturers at home and abroad to prepare solar polysilicon ...

AI Technical Summary

Problems solved by technology

At the same time, in the production of silicon single crystals, the quality level of polysilicon waste produced from integrated circuit-grade silicon single crystals does not meet the requirements of integrated circuits due to resistivity, pollution, etc., and cannot be used for integrated circuit-grade silicon. Production of single crystals; the leftovers produced during the production of solar-grade silicon single crystals, due to the excessive impurities such as dust and particles, are difficult or even impossible to form crystals when they are re-drawn into the furnace, and it is difficult to successfully produce qualified silicon crystals. Silicon single crystal

[0004] At present, the practice of most domestic manufacturers is to mix the leftovers into the raw polysilicon material and put them into the furnace for production, and use the method of doping to digest the leftovers. low

Some manufacturers directly sell off-cuts as waste at a low price, resulting in an increase in production costs; some merchants who purchase off-cuts, after simple classification and processing, even directly mix polysilicon off-cuts with primary polysilicon to serve as good materials Selling to mono-silicon crystal production enterprises will form a vicious circle in severe cases and damage the development of the entire domestic solar photovoltaic industry