Patent ID: 8623139
Filing Date: 2014-01-07
Classification: C01B,C23C,Y10T

Abstract:
1. An apparatus for producing polycrystalline silicon which heats a silicon seed rod in a reactor to which a raw material gas is supplied, and deposits polycrystalline silicon on the surface of the silicon seed rod, the apparatus comprising: an electrode extending in a vertical direction to hold the silicon seed rod; an electrode holder having a cooling flow passage circulating a cooling medium formed therein, and inserted into a through-hole formed in a bottom plate of the reactor to hold the electrode; and an annular insulating material arranged between an inner peripheral surface of the through-hole and an outer peripheral surface of the electrode holder to electrically insulate the bottom plate and the electrode holder from each other, wherein an outer peripheral surface of the electrode holder is provided with an enlarged diameter portion which contacts at least a portion of a top face of an upper end of the annular insulating material and has a portion of the cooling flow passage formed therein, the through-hole includes a lower straight portion and an upper tapered portion whose diameter gradually increases upward, an opening of an upper end of the tapered portion is formed with a counterbore whose diameter increases more than a maximum diameter of the tapered portion, and the enlarged diameter portion is disposed in the counterbore without contacting a side face of the counterbore.