Patent ID: 9379204
Filing Date: 2016-06-28
CPC Classification: H01L

Claim Text:
1. A method comprising: obtaining a structure including a semiconductor substrate having a first lattice constant, a first epitaxial layer of III-V semiconductor material having a second lattice constant different from the first lattice constant directly adjoining a top surface of the semiconductor substrate, and a plurality of first trenches extending vertically within the first epitaxial layer of III-V semiconductor material, the first trenches having bottom ends within the first epitaxial layer of III-V semiconductor material and terminating a distance above the top surface of the semiconductor substrate; filling the first trenches with a dielectric material to form a plurality of dielectric regions within the first epitaxial layer of III-V semiconductor material, each dielectric region having a bottom surface adjoining a top surface of the first epitaxial layer of III-V semiconductor material; removing a portion of the first epitaxial layer of III-V semiconductor material to form a plurality of vertically oriented second trenches between the dielectric regions, and epitaxially growing a second layer of III-V semiconductor material directly on the first epitaxial layer of III-V semiconductor material and within the plurality of second trenches.