Patent ID: 7385257

Claim:
A method comprising: forming a base semiconductor substrate having a first conductivity type and a first crystallographic orientation; forming an insulator layer and a first semiconductor device layer of a second, different crystallographic orientation over the base semiconductor substrate; selectively removing portions of the first semiconductor device layer and the insulator layer from one or more regions of the base semiconductor substrate, thereby forming one or more first device regions that contain the insulator layer and the first semiconductor device layer and one or more second device regions that do not contain the insulator layer and the first semiconductor device layer, wherein an upper surface of the base semiconductor substrate is exposed at the one or more second device regions; epitaxially growing a counter-doped semiconductor layer over the base semiconductor substrate at the one or more second device regions, wherein said counter-doped semiconductor layer has a second, opposite conductivity type; and epitaxially growing a second semiconductor device layer over the counter-doped semiconductor layer at the one or more second device regions, wherein said second semiconductor device layer has the first conductivity type and the first crystallographic orientation.