Patent ID: 8980002
Filing Date: 2015-03-17
Classification: C30B

Abstract:
1. A method, comprising: providing a substrate in a processing chamber of a hydride vapor phase epitaxy processing system; forming an aluminum nitride (AlN) buffer layer by flowing ammonia gas, an aluminum halide containing precursor that is formed by exposing an aluminum metal source to a hydrogen halide gas, and an additional hydrogen halide gas into the processing chamber to suppress homogenous formation of AlN particles; stopping the flow of the aluminum halide containing precursor while continuing to flow the additional hydrogen halide gas and ammonia into the growth zone of the processing chamber for a time period; and forming a group III-nitride layer over the buffer layer, wherein the additional hydrogen halide gas flows directly into the processing chamber up to 1 minute before the aluminum halide containing precursor to suppress homogeneous formation of AlN particles.