Seed crystal for seeding during manufacturing of silicon single crystal rod and manufacturing method of silicon single crystal rod

Abstract

The invention provides a seed crystal for seeding during manufacturing of a silicon single crystal rod and a manufacturing method of the silicon single crystal rod. The seed crystal is conical; a conical shape can ensure that the adsorptive power between fused silicon and the seed crystal is increased, so that seeding cannot be interrupted easily in the seeding process. The impact to a crystal caused by the heat convection in the fused silicon is the main factor that causes seeding interruption, but when the seed crystal provided by the invention is adopted to perform seeding, a silicon rod can better withstand the impact of the heat convection, so that rotating speed of a crucible in the seeding process can be reduced, and the reduction of the rotating speed of the crucible ensures that the power consumption of the seeding process for manufacturing the silicon single crystal rod by a czochralski method is correspondingly reduced. The transverse temperature gradient on the surface of the fused silicon is reduced while the rotating speed of the crucible is reduced to ensure that the heat convection strength of a growth interface of the crystal is reduced, so that the probability that impurities impact the growth interface of the crystal can be avoided, the crystal formation rate of the seeding process is improved, the impurity content in the silicon single crystal rod is reduced, and then the quality of the silicon single crystal rod is improved.

Description

technical field [0001] The invention relates to the field of monocrystalline silicon manufacture, and more specifically, relates to a method for making a seed crystal and a single crystal silicon rod for seeding when manufacturing a single crystal silicon rod. Background technique [0002] The demand for solar cells in modern society is growing, and the market competition in the photovoltaic industry is becoming increasingly fierce. The production of high-quality photovoltaic products and the reduction of production costs of photovoltaic products have become the development direction of many photovoltaic enterprises. [0003] The silicon materials used to manufacture solar cells are divided into two types: monocrystalline silicon and polycrystalline silicon, among which the solar energy conversion rate of monocrystalline silicon cells is higher. The first step in manufacturing monocrystalline silicon solar cells is to manufacture monocrystalline silicon. In the prior art, th...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a method for making seed crystals and single crystal silicon rods for seeding when making single crystal silicon rods, so as to solve the problem that the quality of single crystal silicon rods cannot be effectively improved in the prior art

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