Patent ID: 9169560
Filing Date: 2015-10-27
Classification: C01B,C23C,Y10T

Abstract:
1. A polycrystalline silicon producing apparatus which produces a silicon rod by supplying raw material gas including chlorosilanes to a silicon seed rod which is heated in a reactor so as to deposit polycrystalline silicon on the silicon seed rod, comprising: the reactor; the silicon seed rod which is disposed in the reactor; a power supply which supplies electric current to and heat the silicon seed rod; a pressure controller configured to control an inner pressure of the reactor in a range equal to or larger than 0.4 MPa and equal to or lower than 0.9 MPa; a thermometer which measures a surface temperature of the silicon rod; a current control device configured to control the surface temperature of the silicon rod measured by the thermometer in a range equal to or higher than 1000° C. and equal to or lower than 1100° C.; a raw material gas-supply source which supplies the raw material gas; a raw material gas-controller configured to control a supply amount of the raw material gas from the raw material gas-supply source; and a pre-heater configured to control the raw material gas in a range equal to or higher than 150° C. and equal to or lower than 600° C.; wherein the supply amount of the raw material gas is controlled by the raw material gas-controller configured to control a supply amount of chlorosilanes included in the raw material gas is in a range equal to or larger than 2.0×10 −7 mol/sec/mm 2 and equal to or smaller than 3.0×10 −2 mol/sec/mm 2 depending on a surface area of the growing silicon rod.