Solar-grade polycrystalline silicon product and production method thereof

Abstract

The invention discloses a solar-grade polycrystalline silicon product and a production method thereof. The polycrystalline silicon product includes a silicon core and a polycrystalline silicon body which grows around the silicon core. On the cross section of the polycrystalline silicon rod product, the polycrystalline silicon body forms in a substantially elliptical shape, and the silicon core forms in a substantially rectangular shape which is centered in the elliptical shape. The elliptical-rod polycrystalline silicon product has good physical properties, is favorable for subsequent efficient transportation, and can be produced in a more economical mode.

Description

technical field [0001] The present invention generally relates to polysilicon products, and more particularly to solar-grade polysilicon products produced by reduction methods using silicon cores. Background technique [0002] Current polysilicon products are generally produced using reduction furnaces, usually using square or circular (cross-section) silicon cores to form polysilicon round rod products. This kind of polycrystalline silicon round rod product has many defects, including the damage of physical properties caused by the large curvature of the deposition surface during the CVD process, inconvenient subsequent processing, unfavorable for efficient transportation, and economic cost problems caused by low production efficiency, etc. [0003] Although the applicant's previous patent applications CN106167264A, CN106629737A, CN106698439A, CN107055544A and CN206375678U were improved from different aspects, they still did not solve the above problems well. [0004] Some...

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Problems solved by technology

[0004] Some other patent applications including CN202297149U, CN202625862U, CN105460939A, CN107522205A, etc. focus on the structure of the silicon core itself in order to improve, but are still unsatisfactory in terms of product performance and energy saving.

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