Patent ID: 7556992
Filing Date: 2009-07-07
Classification: H01L

Abstract:
1. A method for making a semiconductor device, comprising: forming a mask over a semiconductor stack, wherein the stack includes a first semiconductor layer comprising a first semiconductor material and having a (100) surface orientation and a channel direction selected from the group consisting of <110> and <100>channel directions, and a second semiconductor layer comprising a second semiconductor material and having a (110) surface orientation and a <211> direction parallel to the channel direction of the first semiconductor layer; patterning the second semiconductor layer to form a plurality of mesas therein capped by the mask; oxidizing the exposed surfaces of the patterned second semiconductor layer; removing the mask, thereby exposing a portion of the second semiconductor material; etching the exposed portion of the second semiconductor material; and patterning the first semiconductor layer with the oxidized surfaces of the second semiconductor layer.