Patent ID: 8119494

Claim:
A method comprising: providing a semiconductor substrate comprising a first semiconductor material, wherein the first semiconductor material comprises silicon; forming a plurality of insulation regions over at least a portion of the semiconductor substrate, with a plurality of trenches separating the plurality of insulation regions apart from each other; performing a first epitaxial growth to epitaxially grow a plurality of semiconductor regions in the plurality of trenches, wherein (111) facets are formed and exposed during the step of the first epitaxial growth, wherein the plurality of semiconductor regions comprises germanium-containing regions; at a time the (111) facets of neighboring ones of the plurality of semiconductor regions touch each other, performing a second epitaxial growth to continue growing the plurality of semiconductor regions to form (100) planes between the neighboring ones of the plurality of semiconductor regions; and forming a dielectric region over portions of the plurality of insulation regions, wherein during the second epitaxial growth, portions of the plurality of semiconductor regions that are over top surfaces of the plurality of insulation regions are confined by the dielectric region.