Growth of cubic crystalline phase structure on silicon substrates and devices comprising the cubic crystalline phase structure

A light emitting diode device comprising:

• a silicon substrate comprising an (001) surface;
• a V-groove in the silicon substrate exposing two opposing {111} surfaces,
• a plurality of light emitter structures supported by the (001) surface of the silicon substrate, the plurality of light emitter structures comprising Group III-nitride compound semiconductor materials having a cubic crystalline phase and an active region in the cubic crystalline phase, the cubic crystalline phase comprising a length dimension, a width dimension and a height dimension, the width dimension decreasing along at least a portion of the height dimension so that the plurality of light emitter structures are tapered, wherein the tapered cubic crystalline phase light emitter structure has two sides that interface with the two opposing {111} surfaces through a first hexagonal crystalline phase structure and a second hexagonal crystalline phase structure, wherein the cubic crystalline phase structure is a different material composition than the silicon substrate;
• and
• a first contact and a second contact, the first contact and second contact being positioned to provide electrical connectivity to the light emitting diode device;
• wherein at least one contact chosen from the first contact and the second contact is transparent to the light emitted from the light-emitting diodes.

A light emitting diode comprising:

• a cubic crystal substrate comprising a V-groove with exposed (111) surfaces;
• a first Group III/V compound semiconductor material deposited on the (111) surfaces having hexagonal crystalline phases supported by the substrate;
• a second Group III/V compound semiconductor material deposited on the first Group III-V semiconductor material having a cubic crystalline phase, an active region being positioned within the cubic crystalline phase, the cubic crystalline phase comprising a length dimension, a width dimension and a height dimension, the width dimension decreasing along at least a portion of the height dimension to form a tapered cubic crystalline-phase light-emitter structure;
• and
• a first contact and a second contact, the first contact and second contact being positioned to provide electrical connectivity to the tapered cubic crystalline-phase light-emitter structure;
• wherein at least one contact chosen from the first contact and the second contact is transparent to the light emitted from the light-emitter structure.