Patent ID: 7989298
Filing Date: 2011-08-02
Classification: H01L

Abstract:
1. A method of making a semiconductor device, comprising: forming a gate conductor overlying a major surface of a monocrystalline active semiconductor region of a substrate; forming first spacers on exposed walls of the gate conductor; using the gate conductor and the first spacers as a mask, implanting at least extension regions in the active semiconductor region; forming dummy spacers extending outward from the first spacers; using the dummy spacers as a mask, etching the active semiconductor region to form recesses having at least substantially straight walls extending downward from the major surface to a bottom surface, wherein the walls are oriented at a substantial angle with respect to a normal to the major surface; epitaxially growing regions of stressed monocrystalline semiconductor material within the recesses; removing the dummy spacers; and completing the transistor, wherein source/drain regions of the transistor are at least partially disposed in the stressed semiconductor material regions.