Patent ID: 8502263

Claim:
A structure comprising: a trench defined in a dielectric layer disposed over and in contact with a top surface of a substrate, the substrate comprising a first crystalline semiconductor material, the trench comprising a width w proximate the top surface of the substrate and comprising a first height h 1 at a top surface of the dielectric layer, the first height h 1 extending from the top surface of the substrate in a direction perpendicular to the top surface of the substrate, the first height h 1 equal to or greater than half the width w; a second crystalline semiconductor material disposed in the trench and adjoining the first crystalline semiconductor material, the second crystalline semiconductor material being lattice-mismatched to the first crystalline semiconductor material, the second crystalline semiconductor material having a second height h 2 at a top surface of the second crystalline semiconductor material, the second height h 2 being equal to or greater than half the width w, the first height h 1 at the top surface of the dielectric layer being greater than the second height h 2 at the top surface of the second crystalline semiconductor material; and a light-emitting device comprising a heteroepitaxial structure, the heteroepitaxial structure being disposed over and in contact with the top surface of the second crystalline semiconductor material, the heteroepitaxial structure being disposed at least partially in the trench, a surface of the heteroepitaxial structure between dissimilar materials being lower than the first height h 1 at the top surface of the dielectric layer.