Patent ID: 8519436

Claim:
A semiconductor device formed over a substrate having a surface and including a first semiconductor material, the device comprising: (a) a dislocation-blocking mask disposed over the substrate, the mask having an opening extending to the surface of the substrate and defined by at least one sidewall, a ratio of a height of the opening to a width of the opening being greater than 0.5; and (b) a regrowth region formed in the opening, the regrowth region including: i. a first portion comprising a second semiconductor material and disposed proximal to the surface of the substrate, dislocation defects in the regrowth region substantially terminating in the first portion; and ii. a second portion disposed above the first portion, the second portion comprising a third semiconductor material; (c) a channel region disposed in the second portion of the regrowth region; and (d) a source region and a drain region, the channel region being disposed therebetween.