Patent ID: 7339255

Claim:
A semiconductor substrate, comprising: a GaN substrate having a surface bidirectionally inclined from a {0001} crystal plane by two specified off-angles with respect to two crystal axis directions, respectively, such that an orientation of the surface is defined by a first absolute value of a first off-angle of the surface from the {0001} crystal plane towards <1−100> direction, the first absolute value is equal to or larger than 0.12 degree and equal to or smaller than 0.35 degree and by a second absolute value of a second off-angle of the surface from the {0001} crystal plane towards <11−20> direction, the second absolute value is larger than 0.00 degree and equal to or smaller than 0.06 degree; and a single-crystal layer formed of III-V nitride compound semiconductor epitaxially grown on the surface of the GaN substrate.