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Core wire holder and method for producing silicon

  • US 10,640,385 B2
  • Filed: 10/30/2015
  • Issued: 05/05/2020
  • Est. Priority Date: 11/04/2014
  • Status: Active Grant
First Claim
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1. A core wire holder attached on a metal electrode placed on a bottom panel of a device for producing silicon by Siemens process, the core wire holder comprising:

  • a silicon core wire holding portion being generally circular truncated cone-shaped, and configured to hold and energize a silicon core wire, wherein;

    the silicon core wire holding portion is inscribed and includes a generally circular truncated cone having an upper surface formed with a silicon core wire insertion hole for holding the silicon core wire,the circular truncated cone includes an upper surface in a shape of a first circle with a diameter “

    a”

    ,the circular truncated cone includes a bottom surface in a shape of a second circle with a diameter “

    b”

    ,the circular truncated cone has a height “

    h”

    ,the silicon core wire holding portion includes a chamfered portion having a curved surface formed on a ridge formed by the upper surface and a side surface of the silicon core wire holding portion,the curved surface has a radius “

    R”

    of curvature, and“

    a”

    , “

    b”

    , “

    h”

    , and “

    R”

    satisfy the following conditions;

    a<

    b, a≤

    h≤

    (15*a), and (a/10)≤

    R≤

    (2*b) such that a possibility in growth of cracking of a silicon rod formed by depositing polysilicon on the silicon core wire is reduced.

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