Patent ID: 7405098
Filing Date: 2008-07-29
Classification: C30B,H01L,Y02E,Y02P

Abstract:
1. A method for forming a liquid phase epitaxial (LPE) germanium (Ge)-on-insulator (GOI) thin-film with a smooth surface, the method comprising: providing a silicon (Si) wafer; forming a silicon nitride insulator layer overlying the Si wafer; selectively etching the silicon nitride insulator layer, forming a Si seed access region; conformally depositing Ge overlying the silicon nitride insulator layer and Si seed access region; forming a Ge layer with a first surface roughness; smoothing the Ge layer using a chemical-mechanical polish (CMP) process; and, in response to the smoothing, forming a second surface roughness on the Ge layer, less than the first surface roughness.