Patent ID: 7808082

Claim:
A method of fabricating a semiconductor structure, comprising: forming a first single crystalline semiconductor portion and a second single crystalline semiconductor portion that are laterally surrounded by a shallow trench isolation (STI) structure embedded in a semiconductor substrate wherein said first and second single crystalline semiconductor portions have a substrate orientation; subjecting, in a single etch step and while masking said second single crystalline semiconductor portion with a masking material, said first single crystalline semiconductor portion to at least one etchant to form at least two new facets which are joined with a lambda shaped cross-sectional profile with surface orientations that are at an angle substantially greater than zero degree to said substrate orientation and is substantially not orthogonal to said substrate orientation, wherein said at least two facets protrude above a top surface of said STI structure, terminate at sidewalls of said STI structure, and two of said at least two facets are adjoined at a ridge located above said top surface of said STI structure at an end of said single etching step; and forming a first gate dielectric on said at least two new facets and a second gate dielectric on said second single crystalline semiconductor portion.