Patent ID: 6596085
Filing Date: 2003-07-22
Classification: B01F,C23C

Abstract:
Apparatus for use with a source of carrier gas and a source of liquid precursor for performing chemical vapor deposition, comprising:a deposition chamber having a lid; and a vaporizer carried by said lid, said vaporizer comprising a body defining a cavity having an outlet and an inlet wherein said outlet is larger than said inlet, said body further defining a first passageway coupled to said inlet and having a width W and a length L and adapted to carry a mixed flow of carrier gas and a liquid precursor to said cavity inlet, wherein the ratio of said length L to said width W of said first passageway to said cavity inlet does not exceed 20:1, wherein said liquid precursor is dispersed by said carrier gas expanding through said cavity and wherein said first passageway has a carrier gas inlet and a liquid precursor inlet spaced from said cavity inlet by said first passageway length L, and wherein said body further comprises a second passage way adapted to carry a flow of liquid precursor and coupled to said first passageway liquid precursor inlet, and a third passageway coupled to said first passageway carrier gas inlet and adapted to carry a flow of carrier gas to said first passageway, said first passageway being shaped so as to direct a flow of carrier gas past said liquid precursor inlet so that the flow of carrier gas shears said flow of liquid precursor into droplets of liquid precursor to form a mixed flow of both said liquid precursor droplets and said carrier gas wherein said first passageway carries said mixed flow of both said liquid precursor droplets and said carrier gas over said length L to said cavity inlet and wherein said cavity has a flow cross-sectional area which increases monotonically from said inlet to said outlet.