Patent ID: 8592864
Filing Date: 2013-11-26
Classification: H01L

Abstract:
1. A method for forming a semiconductor device, comprising: providing a substrate; forming an insulating layer on the substrate; forming a trench in the insulating layer to expose an upper surface of the substrate; forming a first buffer layer on the exposed upper surface of the substrate by a selective epitaxy, wherein the first buffer layer includes a SiGe layer in which a content of Ge increases gradually in a growth direction of the SiGe layer and the content of Ge larger than 50 at. %; and forming a compound semiconductor layer on the first buffer layer epitaxially, wherein an aspect ratio of the trench is larger than 1 and smaller than 10, wherein the first buffer layer is formed by a low-temperature reduced pressure chemical vapor deposition process at a temperature between 200° C. and 500° C., and wherein the compound semiconductor layer is formed by a low-temperature metal organic chemical vapor deposition process at a temperature between 200° C. and 600° C.