Patent ID: 8629477

Claim:
A structure comprising: a substrate comprising a first crystalline semiconductor material; a non-crystalline layer over the substrate, the non-crystalline layer having a trench extending to a surface of the substrate, the trench defining an area of the surface of the substrate, a sidewall of the trench defining an arbitrary length of the area, the arbitrary length being with respect to trapping dislocations, at least a first portion of the sidewall extending perpendicular to the surface of the substrate; and a second crystalline semiconductor material disposed at least partially in the trench and adjoining the first crystalline semiconductor material, the second crystalline semiconductor material being lattice mismatched to the first crystalline semiconductor material, threading dislocation segments in the second crystalline semiconductor material arising from the lattice mismatch propagating in a crystallographic direction parallel to the surface of the substrate and at a first angle away from the surface of the substrate, the sidewall being oriented at a second angle to the crystallographic direction, the second angle being between 30° and 60°, the threading dislocation segments terminating at the first portion of the sidewall.