Patent ID: 7132322
Filing Date: 2006-11-07
Classification: H01L

Abstract:
1. A method of forming a semiconductor device comprising: depositing a silicon thin film onto a dielectric layer formed on a semiconductor substrate; depositing an upper thin film on a top surface of said silicon thin film containing germanium; patterning and etching said upper thin film using a selective etch leaving said upper thin film intact in a first region and removing said upper thin film exposing said top surface of said silicon thin film in a second region; diffusing germanium from said upper thin film into said silicon thin film in said first region; depositing a gate electrode layer covering said upper thin film in said first region and covering said exposed portion of said silicon thin film in said second region; patterning and etching to form gate electrode stacks; and forming FET devices with sidewall spacers and source regions and drains regions in said substrate aligned with said gate electrode stacks.