Patent ID: 6254933
Filing Date: 2001-07-03
Classification: C23C,C30B

Abstract:
A method of performing chemical vapor deposition which comprises:providing a horizontal cold-wall reaction chamber equipped with a gas inlet at an upstream end for receiving a reactant gas, and a gas outlet at a downstream end for flowing a reactant gas horizontally in one direction through said reaction chamber;supporting a semiconductor substrate in the reaction chamber so that a main surface of the semiconductor substrate is aligned horizontally;arranging the semiconductor substrate within a distance W measured from a leading edge of the semiconductor substrate, which leading edge is located at a most upstream portion of the reaction chamber, along a direction toward the gas outlet, and the semiconductor substrate being positioned in a location in which a W/G ratio is 15 or larger so that a rotation number of a vertical vortex due to natural convection is suppressed to 1 or less within the distance W measured from a leading edge of the semiconductor substrate, wherein W is an internal width of the reaction chamber and G is a distance between the main surface of the semiconductor substrate and a ceiling of the reaction chamber above the semiconductor substrate;heating the semiconductor substrate to a temperature for growing a crystalline film on the semiconductor substrate, said temperature being sufficient to create natural convection between the semiconductor substrate and internal side walls of the reaction chamber due to temperature differences therebetween; andsuppying the reaction chamber with a reactant gas; andgrowing a crystalline film on the semiconductor substrate by chemical vapor deposition.