Patent ID: 7863141
Filing Date: 2011-01-04
Classification: H01L

Abstract:
1. A method of fabricating a semiconductor device comprising: providing a substrate comprising a first device region; forming at least one doped region in the substrate; forming a stressor layer over the substrate, the stressor layer comprising a semiconductor stressor material; forming a semiconductor surface layer over the stressor layer; and selectively removing the at least one doped region to form at least one buried cavity in the first device region, the buried cavity is disposed below the stressor layer, the buried cavity causing the stressor layer to have a relaxed portion overlying the buried cavity; forming a first transistor in the first device region; and wherein the stressor layer is a continuous stressor layer in the first device region, the relaxed portion of the continuous stressor layer caused by the buried cavity below creates a first strain in the surface layer to enhance performance of the first transistor in the first device region.