Patent ID: 6868869

Claim:
A vapor delivery system for vaporization and sub-atmospheric delivery of a source material, comprising: a) a vaporization vessel enclosing an interior volume that contains a solid or liquid low vapor pressure source material selected from the group consisting of decaborane, hafnium tetrachloride, zirconium tetrachloride, indium trichloride, metalorganic β-diketonate complexes, cyclopentadienylcycloheptatrienyl-titanium (C p TiCht), aluminum trichloride, titanium iodide, cyclooctatetraenecyclo-pentadienyltitanium, biscyclopentadienyl-titaniumdiazide, trimethyl gallium, trimethyl indium, aluminum alkyls, trimethylaluminum, triethylaluminum, trimethylamine alane, tetramethyl tin, diethyl cadmium and tungsten carbonyl, wherein the vaporization vessel includes a heating means for vaporizing said solid or liquid low vapor pressure source material, a fill port for introducing said source material and an outlet port for discharged vaporized source material, and wherein said vaporization vessel is devoid of flow of carrier gas therethrough; b) a gas pressure regulator positioned within the vaporization vessel, wherein the gas pressure regulator is set to release vaporized source material at a predetermined sub-atmospheric pressure; c) a processing tool positioned downstream from the vaporization vessel; d) at least one connecting vapor line positioned between the vaporization vessel and processing tool and in fluid communication therewith; e) a mass flow controller in fluid communication with the connecting vapor line to establish a flow rate of the discharged vaporized source material into the downstream processing tool; f) a venturi positioned between the processing tool and the mass flow controller and communicatively connected therebetween, wherein the venturi reduces the pressure in the connecting vapor line to a sufficient level to actuate the gas pressure regulator for releasing vaporized source material from the vaporization vessel; and g) a carrier/diluent gas line connected to the venturi for introducing a carrier/diluent gas to the venturi thereby mixing the carrier/diluent gas with the vaporized source material before delivery to the processing tool.