Patent ID: 7645651
Filing Date: 2010-01-12
Classification: H01L

Abstract:
1. A method of forming a metal oxide semiconductor (MOS) device comprising: defining an active area in an unstrained semiconductor layer structure, the active area including at least a first doped region of a first conductivity type and a second doped region of a second conductivity type; depositing a hard mask overlying the active area and a region outside of the active area; patterning the hard mask to expose the active area; selectively growing a strained semiconductor layer overlying the exposed active area, the strained semiconductor layer thereby providing a biaxially strained channel for the MOS device; and forming a remainder of the MOS device including forming at least a gate dielectric, gate electrodes, source and drain implants, and sidewall spacers, wherein during a portion of forming the remainder of the MOS device, dopant of the first conductivity type of the first doped region of the active area and dopant of the second conductivity type of the second doped region of the active area diffuses into overlying portions of the strained semiconductor layer to create a correspondingly doped strained semiconductor layer, the correspondingly doped strained semiconductor layer thereby providing corresponding doping for the biaxially strained channel of the MOS device.