Patent ID: 9076666
Filing Date: 2015-07-07
Classification: C30B,H01L

Abstract:
1. A method of depositing III-nitride semiconductor material on a substrate using at least one of a metal trichloride precursor and a metal tetrachloride precursor, comprising: depositing a layer of III-nitride semiconductor material on a surface of a substrate in a nucleation HVPE process stage to form a nucleation layer having a nanostructure comprising at least some wurtzite crystallites and some amorphous III-nitride semiconductor material; annealing the nucleation layer to form crystalline islands of at least substantially wurtzite nucleation material on the surface of the substrate; growing and coalescing the islands of at least substantially wurtzite nucleation material in a coalescence HVPE process stage to form a nucleation template layer of the at least substantially wurtzite nucleation material at least substantially covering the surface of the substrate; depositing additional III-nitride semiconductor material over the nucleation template layer of the at least substantially wurtzite nucleation material in an additional HVPE process stage; and selecting and tailoring the parameters of the nucleation HVPE process stage and the parameters of the annealing of the nucleation layer so as to preferentially form the crystalline islands to have a peak shape as opposed to a mesa shape.