Patent ID: 7763527

Claim:
A method for fabricating a semiconductor element comprising: a first step of producing a processed substrate by forming, on a substrate having a nitride semiconductor layer as at least part of a surface thereof, an engraved region including at least one depressed portion and a ridge portion as a non-engraved region; and a second step of laying a nitride semiconductor layered-structure portion including at least one type of nitride semiconductor thin film both in the engraved region and on a surface of the ridge portion, wherein, in the second step, a first dummy-ridge portion is formed on a region of the ridge portion close to the engraved region so as to protrude from the surface of the nitride semiconductor layer above the ridge portion by making a thickness of the nitride semiconductor layered-structure portion laid on the region of the ridge portion close to the engraved region as measured from the surface of the ridge portion to a surface of the nitride semiconductor layered-structure portion greater than a thickness of the nitride semiconductor layered-structure portion laid on a semiconductor element production region, which is a region of the ridge portion other than the region thereof close to the engraved region, as measured from the surface of the ridge portion to the surface of the nitride semiconductor layered-structure portion.