公开(公告)号：AT552611T

公开(公告)日：2012-04-15

申请号：AT04703076

申请日：2004-01-16

Applicant: IBM

Inventor： CHEN HUAJIE ,  BEDELL STEPHEN ,  SADANA DEVENDRA ,  MOCUTA DAN

IPC: H01L21/331 ,  H01L21/02 ,  H01L21/20 ,  H01L21/205 ,  H01L21/316 ,  H01L21/762 ,  H01L21/84 ,  H01L29/10 ,  H01L29/786

Abstract: A method of forming a silicon germanium on insulator (SGOI) structure. A SiGe layer is deposited on an SOI wafer. Thermal mixing of the SiGe and Si layers is performed to form a thick SGOI with high relaxation and low stacking fault defect density. The SiGe layer is then thinned to a desired final thickness. The Ge concentration, the amount of relaxation, and stacking fault defect density are unchanged by the thinning process. A thin SGOI film is thus obtained with high relaxation and low stacking fault defect density. A layer of Si is then deposited on the thin SGOI wafer. The method of thinning includes low temperature (550° C.-700° C.) HIPOX or steam oxidation, in-situ HCl etching in an epitaxy chamber, or CMP. A rough SiGe surface resulting from HIPOX or steam oxidation thinning is smoothed with a touch-up CMP, in-situ hydrogen bake and SiGe buffer layer during strained Si deposition, or heating the wafer in a hydrogen environment with a mixture of gases HCl, DCS and GeH4.