Patent ID: 7361518
Filing Date: 2008-04-22
Classification: B82Y,H01S

Abstract:
1. 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 first step, the engraved region is so formed as to include two or more depressed portions and a narrow flat portion sandwiched therebetween, the narrow flat portion having a width of 100 μm or less in a direction perpendicular to a first direction in which the engraved region extends, and wherein, in the second step, a second dummy-ridge portion is formed in the narrow flat portion by making a thickness of the nitride semiconductor layered-structure portion laid on the narrow flat portion as measured from the surface of the narrow flat portion to the surface of the nitride semiconductor layered-structure portion greater than the thickness of the nitride semiconductor layered-structure portion laid on the semiconductor element production region as measured from the surface of the ridge portion to the surface of the nitride semiconductor layered-structure portion.