Patent ID: 8329132
Filing Date: 2012-12-11
Classification: C01B

Abstract:
1. A polycrystalline silicon manufacturing method comprising: heating a plurality of silicon seed rods standing in a bell shaped reactor; ejecting a raw gas upward in the bell shaped reactor from a plurality of gas supplying ports for ejecting raw gas so that polycrystalline silicon is deposited from the raw gas on the surfaces of the silicon seed rods; and exhausting exhaust gas after reaction from gas exhausting ports, provided on an inner bottom plate of the bell shaped reactor; wherein for a set amount of time at an early stage of the reaction, ejecting raw gas from gas supplying ports adjacent to a center of the reactor is performed as follows: closing valves of selected gas supplying ports adjacent to the center of the reactor for a predetermined amount of time so as to stop ejection of raw gas from the selected gas supplying ports while ejecting raw gas from all other gas supplying ports and after the predetermined amount of time opening the valves of the selected gas supplying ports, and closing valves of newly selected gas supplying ports adjacent to the center of the reactor for another predetermined amount of time while ejecting raw gas from all other gas supplying ports and after the another predetermined amount of time opening the newly selected gas supplying ports, and repeating.