摘要:
An epitaxial deposition process produces epitaxial lateral overgrowth (ELO) of nitride based materials directly a patterned substrate (10). The substrate (10) is preferably formed from SiC or sapphire, and is patterned with a mask (12), preferably formed of silicon nitride, having a plurality of openings (13) formed therein. A nucleation layer (14), preferably formed of AlGaN, is grown at a high reactor temperature of 700-1100 degrees C., which wets the exposed substrate surface, without significant nucleation on the mask (12). This eliminates the need for regrowth while producing smooth growth surfaces in the window openings (13) as well as over the mask (12). Subsequent deposition of a nitride based material layer (16), preferably GaN, results in a relatively defect free planar surfaced material grown laterally over the mask (12).
摘要:
Bulk single crystals of AlN having a diameter greater than about 25 mm and dislocation densities of about 10,000 cm−2 or less and high-quality AlN substrates having surfaces of any desired crystallographic orientation fabricated from these bulk crystals.
摘要:
In various embodiments, a semiconductor device includes an aluminum nitride single-crystal substrate, a pseudomorphic strained layer disposed thereover that comprises at least one of AlN, GaN, InN, or an alloy thereof, and, disposed over the strained layer, a semiconductor layer that is lattice-mismatched to the substrate and substantially relaxed.
摘要:
Semiconductor structures and devices based thereon include an aluminum nitride single-crystal substrate and at least one layer epitaxially grown thereover. The epitaxial layer may comprise at least one of AlN, GaN, InN, or any binary or tertiary alloy combination thereof, and have an average dislocation density within the semiconductor heterostructure is less than about 106 cm−2.