Patent ID: 7485524
Filing Date: 2009-02-03
Classification: H01L

Abstract:
1. A method for forming a semiconductor device, comprising: crystallographically etching a semiconductor substrate at selected source and drain regions of a MOSFET to form surface recesses therein, wherein the semiconductor substrate has an upper surface oriented along one of a first set of equivalent crystal planes, and wherein each surface recess has a bottom surface that is parallel to the upper surface of the semiconductor substrate and one or more sidewall surfaces that are oriented along a second, different set of equivalent crystal planes, wherein the upper surface of the semiconductor substrate is oriented along one of the {110} planes of silicon, and wherein the one or more sidewall surfaces of the surface recesses are oriented along the {100} planes of silicon; growing a semiconductor material having a different lattice constant from the semiconductor substrate in said surface recesses at the source and drain regions to form semiconductor structures having upper surfaces or portions of upper surfaces that are slanted in relation to an upper surface of the semiconductor substrate, said semiconductor material comprising pseudomorphic SiGe or Si:C; and forming a stress-inducing dielectric layer over the slanted upper surfaces of the semiconductor structures at the source and drain regions.