Patent ID: 7994028
Filing Date: 2011-08-09
Classification: H01L

Abstract:
1. A method of forming a semiconductor structure, comprising: providing a semiconductor-on-insulator layer having a single crystalline group IV semiconductor layer having a first lattice constant, wherein said single crystalline group IV semiconductor layer comprises a material selected from silicon, germanium, carbon and an alloy thereof; forming at least one isolation trench in said single crystalline group IV semiconductor layer and forming a first region and a second region out of the remaining portions of said single crystalline group IV semiconductor layer, wherein said first and second regions are separated by said at least one isolation trench; masking said first region with a material layer that is one of an inorganic masking layer or a near-infrared wavelength transparent layer; forming a single crystalline lattice mismatched group IV semiconductor alloy layer abutting said second region and containing a top portion having a second lattice constant, wherein said second lattice constant is different from said first lattice constant; epitaxially growing at least one single crystalline compound semiconductor layer abutting said single crystalline lattice mismatched group IV semiconductor alloy layer, wherein said single crystalline compound semiconductor layer has a third lattice constant, said second lattice constant is between said first lattice constant and said third lattice constant, and wherein a sidewall of said material layer contacts a sidewall of said at least one single crystalline compound semiconductor layer during said epitaxial growth of said at least one single crystalline compound semiconductor layer, and another sidewall of said material layer contacts a sidewall of said first region during said epitaxial growth of said at least one single crystalline compound semiconductor layer; and removing at least a portion of said material layer, wherein a top surface of a buried insulator layer is exposed in a recessed region between said first region and said second region after said material layer is removed.