Patent ID: 9093275
Filing Date: 2015-07-28
Classification: H01L

Abstract:
1. A method of forming a semiconductor structure comprising: forming a first dielectric material layer on a top surface of a semiconductor layer of a semiconductor-on-insulator (SOI) substrate, said semiconductor layer being a first single crystalline semiconductor material portion comprising a first single crystalline semiconductor material; forming a first trench through said first dielectric material layer and an upper region of said semiconductor layer; growing a second single crystalline semiconductor material portion from surfaces of said semiconductor layer within said first trench in a first selective epitaxy process, wherein said second single crystalline semiconductor material portion comprises a second single crystalline semiconductor material and fills said first trench; forming a second dielectric material layer on said top surface of said first dielectric material layer and a top surface of said second single crystalline semiconductor material portion; forming a second trench through said second dielectric material layer, said first dielectric material layer, and another upper region of said semiconductor layer; and growing a third single crystalline semiconductor material portion from surfaces of said semiconductor layer within said second trench by a second selective epitaxy process, wherein said third single crystalline semiconductor material portion comprises a third single crystalline semiconductor material and fills said second trench.