Patent ID: 8299502

Claim:
A semiconductor heterostructure, comprising: a crystalline substrate of a first semiconductor material; a mask disposed over a surface of said crystalline substrate, said mask having openings comprising a plurality of elongated opening sections; and an overgrowth crystalline layer of a second semiconductor material, filling said openings and covering said mask, said second semiconductor material being InP, GaAs or a combination thereof; wherein, at least one first section of said elongated opening sections is directed non-parallel relative to at least one second section of said elongated opening sections, said plurality of elongated opening sections have a width less than or equal to 500 nm, said elongated opening sections are crossing linear opening sections, a longitudinal direction of at least one of said first section and said second section is directed in non-zero angles with respect to both main crystal axes of said surface of said crystalline substrate, and at least one of said non-zero angles with respect to both main crystal axes of said surface of said crystalline substrate and said non-zero angle with respect to all symmetry planes of said surface of said crystalline substrate is larger than 5°.