Patent ID: 8790429

Claim:
A reactor for polycrystalline silicon in which a silicon seed rod installed inside the reactor is heated by supplying electricity, a raw material gas supplied inside the reactor is allowed to react, thereby producing polycrystalline silicon on the surface of the silicon seed rod, the reactor for polycrystalline silicon, comprising: a bottom of the reactor; a cylindrical raw material gas supply port installed upright on the bottom of the reactor; a cylindrical raw material gas supply nozzle which extends upward and is attached to the upper part of the raw material gas supply port so as to be communicatively connected to the raw material gas supply port, and electrodes which are provided on the bottom to retain the both end of the silicon seed rod; the upper end of the raw material gas supply nozzle being set to a height in a range from −10 cm to +5 cm on the basis of the upper end of the electrodes; the raw material gas supply nozzle having a lower end face having a diameter greater than that of the raw material gas supply port and facing to the bottom of the reactor, and a gap being made of the bottom of the reactor, an outer surface of the cylindrical raw material gas supply port and the lower end face of the raw material gas supply nozzle.