Patent ID: 8840723

Claim:
An apparatus for manufacturing polycrystalline silicon whereby raw-material gas is supplied to one or more heated silicon seed rods provided vertically in a reactor and provided to comprise a corner in a horizontal cross-section so as to deposit the polycrystalline silicon on a surface of the silicon seed rod, comprising: a seed rod holding member, made of carbon, having a holding hole with one opening in which a lower end of the silicon seed rod is inserted, the holding hole having a horizontal cross-sectional shape with at least two corners, and the seed rod holding member having a plurality of screw holes formed at an upper portion of the holding hole and extending from the outer surface of the seed rod holding member to at least the holding hole and formed at the at least two corners of the holding hole; and, a fixing screw which fixes the silicon seed rod is made of the same carbon as the seed rod holding member and is threaded through at least one of the plurality of screw holes, and wherein the silicon seed rod is partially inserted into one of the plurality of screw holes in a horizontal cross section; a horizontal cross-sectional area of the holding hole is larger than a horizontal cross-sectional area of the silicon seed rod so that a dimensional difference is formed between the silicon seed rod and the holding hole; and when the silicon seed rod is inserted in the holding hole, the corner of the silicon seed rod is pressed by the fixing screw and the silicon seed rod is in contact with an inner surface of the holding hole.