Patent ID: 7012314

Claim:
A semiconductor device comprising: (a) a single crystal semiconductor body of a first material; (b) a dielectric cladding region disposed on a major surface of the body; (c) the cladding region having a first opening that extends to a first depth therein; (d) the cladding region having a smaller second opening, within the first opening, that extends to a second depth greater than the first depth and that exposes an underlying portion of the body; (e) a second semiconductor material filling each of the openings and on the top of the cladding region so as to form an active region in the first opening and a first stem region in the second opening; the top of the active region being essentially flush with the top of the cladding region; and (f) the dimensions of the second opening being such that defects are confined to the stem region, the active region being essentially free of defects.