Patent ID: 7972916
Filing Date: 2011-07-05
Classification: H01L

Abstract:
1. A method of manufacturing a semiconductor device, comprising: forming a sacrificial stressor layer over a semiconductor region having a semiconductor surface, the sacrificial stressor layer formed in a stressed state in comparison to its equilibrium state; transferring stress from the sacrificial stressor layer to the semiconductor region to strain the semiconductor region; stabilizing the strain in the semiconductor region and removing at least portions of the sacrificial stressor layer so that strain is present in the semiconductor region extending along at least a first in plane direction and a second in plane direction; etching first and second recesses through the semiconductor surface and into the semiconductor region to form a defined semiconductor region, the etching at least partially relaxing strain along the first direction within the defined region; and forming a transistor so that at least a portion of a channel region of the transistor is within the defined semiconductor region.