Patent ID: 8545627
Filing Date: 2013-10-01
Classification: C30B,H01L

Abstract:
1. A method for forming an epitaxial buffer layer over a substrate by molecular beam epitaxy comprising: contacting a substrate with a precursor gas at a temperature and a pressure suitable for depositing an epitaxial buffer layer over the substrate; the epitaxial buffer layer having a thickness of greater than 100 nm and comprising ZrB wherein the precursor gas comprises (i) greater than 95% v/v hydrogen gas and (ii) 0.1-5% v/v of a precursor source, wherein the precursor source comprises Zr(BH wherein the use of the hydrogen gas reduces the surface roughness of the epitaxial layer by acting as a diluent to prevent the poisoning of the surface of the epitaxial layer with B-rich fragments.