Patent ID: 7977706

Claim:
A structure comprising: a dielectric layer disposed over a semiconductor substrate comprising a first semiconductor material; a trench disposed in the dielectric layer and (i) extending to a surface of the substrate, (ii) being defined by at least one sidewall having a height h at least equal to a predetermined distance H from the surface of the substrate, and (iii) having a width w; a crystalline material at least partially disposed in the trench, the crystalline material including a first layer comprising a second semiconductor material and a second layer comprising a third semiconductor material, a side portion of the crystalline material extending above the dielectric layer; and a gate disposed over the crystalline material, wherein (i) a ratio of the height h to the width w is ≧0.5, (ii) a majority of dislocation defects in the crystalline material terminate at or below the predetermined distance H, (iii) h≧H, and (iv) the third semiconductor material includes a strained channel.