Patent ID: 8887650

Claim:
A method for forming a monocrystalline Group III-V semiconductor material which comprises: reacting an amount of a gaseous Group III precursor as one reactant with an amount of a gaseous Group V component as another reactant in a reaction chamber under conditions sufficient to manufacture the semiconductor material, introducing the reactants so that they react at a predetermined location in the reaction chamber adjacent and above one or more substrates to deposit semiconductor material thereon, and injecting one or more purge gas streams to assist in-directing at least one of the reactants to the predetermined location, wherein the purge gas streams are injected through a plurality of apertures in a gate valve that is mounted adjacent an inlet port of the reaction chamber, the gate valve being closable to seal the inlet port of the reaction chamber and being openable to allow transfer of materials between the reaction chamber interior and exterior through the inlet port.