Patent ID: 6432205
Filing Date: 2002-08-13
Classification: C23C,C30B

Abstract:
A gas feeding system for chemical vapor deposition reactor having at least one reactant source supply apparatus, said supply apparatus comprising:a mass flow controller for controlling the flow rate of a carrier gas which carries a reactant source; a supply tube connected between said mass flow controller and a reactor for chemical vapor deposition; a reservoir for containing said reactant source, said reservoir connected to said supply tube, said reservoir having inlet and outlet valves for controlling the flow of said carrier gas through said reservoir between said supply tube and said reservoir; a supply valve for controlling the mass flow of said reactant source carried by said carrier gas to said reactor, said supply valve disposed between said outlet valve and said reactor; an evacuation valve disposed between said outlet valve and said supply valve, said evacuation valve evacuating said carrier gas or said reactant source toward a vacuum pump; and a pass valve disposed in said supply tube between said inlet valve and said outlet valve so that the carrier gas passing therethrough flows into said reactor or said evacuation valve without passing through said reservoir when said inlet valve and outlet valve are closed, said pass valve stabilizing said carrier gas mass flow controller as well as preventing the leakage of said reactant source from said reservoir.