Patent ID: 6909839
Filing Date: 2005-06-21
Classification: B01D,C23C

Abstract:
1. A vapor delivery system for vaporization and delivery of a vaporized source material comprising a vaporization vessel enclosing an interior volume, wherein the vaporization vessel comprises a heating means for vaporizing a source material; an inlet port for introducing a source material and an outlet port for discharging vaporized source material; a processing tool positioned downstream from the vaporization vessel; a connecting vapor line positioned between the vaporization vessel and processing tool and in fluid communication therewith; and additionally at least one flow control feature comprising: a) a mass flow controller in fluid communication with the connecting vapor line to provide a controlled flow of vaporized source material from the vaporization vessel to the processing tool; b) a constant flow control valve in fluid communication with the connecting vapor line, wherein the control valve has an orifice sized to provide a controlled and constant flow of vaporized source material to the processing tool via the connecting vapor line; c) an adjustable needle valve connected to the outlet port of the vaporization vessel, wherein the opening of the needle valve is continuously adjusted based on the vapor pressure within the vaporization vessel to provide a controlled and constant flow of vaporized source material to the processing tool via the connected vapor line; d) a Knudsen cell structure integral to the vaporization vessel or connected to the outlet port of the vaporization vessel, wherein the Knudsen cell has an orifice sized to provide a controlled and constant flow of vaporized source material to processing tool via the connecting vapor line; e) a syringe system for accurately delivering a controlled amount of a liquid source material into the vaporization vessel for vaporization therein; or f) a screw delivery device for accurately delivering a solid source material into the vaporization vessel for vaporization therein.