Patent ID: 7785970
Filing Date: 2010-08-31
Classification: H01L

Abstract:
1. A method of fabricating a semiconductor device, comprising: providing a substrate having a first-type semiconductor device region and a second-type semiconductor device region; forming first source and drain regions in the first-type semiconductor device region with the second-type semiconductor device region masked; forming a first capping layer comprising one of a tensile stress or compressive stress capping layer over the first-type semiconductor device region and over the second-type semiconductor device region; performing a first thermal process to re-crystallize the first source and drain regions and to introduce a corresponding one of tensile strain or compressive strain by transfer of stress from the first capping layer into the first source and drain regions; after said first thermal process, forming second source and drain regions in the second-type semiconductor device region with the first-type semiconductor device region masked; forming a second capping layer comprising the other of the tensile stress or compressive stress capping layer over the first-type semiconductor device region and over the second-type semiconductor device region; and performing a second thermal process to re-crystallize the second source and drain regions and to introduce a corresponding other of the tensile strain or compressive strain by transfer of stress from the second capping layer into the second source and drain regions.