Abstract:
A precursor delivery system for an irradiation beam instrument having a vacuum chamber includes an injection tube (340) for injecting gasses into the vacuum chamber of the instrument and a main gas line (290) having an inlet (295) and an outlet 335). The outlet (335)is connected to the injection tube, (340) and the inlet (295) is connected to a sequential pair of valves (120, 125) connected to a carrier gas source (150). A crucible (190) for holding precursor material is selectively connected to the main gas line (290) at a location between the pair of valves (120, 125) and the injection tube (340). The source (150) of carrier gas may be selectively connected to the inlet (295) by sequential operation of the pair of carrier gas valves (120, 125), so that pulses of carrier gas assist the flow of precursor material to the injection tube (340). Rapid purging of the system between precursors is enabled by a valve (110) selectively connecting the main line (290) to an envelope (300) in communication with the instrument vacuum. Methods of CVD and etching using the system are also disclosed.
Abstract:
A gas injection system for an energetic-beam instrument having a vacuum chamber. The system has a cartridge containing a chemical serving as a source for an output gas to be delivered into the vacuum chamber. The cartridge has a reservoir containing the chemical, which rises to a fill line having a level defined by an amount of the chemical present in the reservoir at a given time, An outlet from the reservoir is coupled to an output passage through an outlet valve and configured so that when the system is tilted the outlet remains above the level of the fill line. Embodiments include isolation valves allowing the cartridge to be disconnected without destroying system vacuum.