Patent ID: 6085690
Filing Date: 2000-07-11
Classification: C23C

Abstract:
A chemical vapor deposition apparatus, comprising:a reaction chamber for holding a substrate and including a plurality of exhaust ports and the reaction chamber having a dead space therein, the exhaust port being located below the substrate and in an area that is external to an outer diameter of the substrate the dead space partially defined by an upper wall of the reaction chamber and being outside of a flow-way of a reaction gas which reaches the plurality of exhaust ports, the dead space includes an inlet area through which reaction gas may enter, but which does not include an outlet through which the reaction gas can escape;reaction gas inlet located at a top part of the reaction chamber facing toward the substratemeans for delivering a purge gas to all of the dead space, the means for delivering the purge gas arranged adjacent to the upper wall; andmeans for exhausting the purge gas from the reaction chamber such that a uniform down-flow of purge gas is formed in the dead space from the means for delivering to the plurality of exhaust ports so that reaction gas in the dead space is substantially eliminated.