Patent ID: 6695913
Filing Date: 2004-02-24
Classification: B82Y,H01L,H01S

Abstract:
A method of growing a III-nitride optoelectronic semiconductor device having an active region of a III-nitride semiconductor material including at least In which is lattice mismatched with a further III-nitride semiconductor material of one or more cladding regions, the device comprising a substrate and formed sequentially on the substrate; a first cladding region of a first doping type; an active region; a second cladding region of a second doping type opposite to the first doping type, the method comprising the steps of:successively growing the first cladding region, the active region and the second cladding region on the substrate, and between the growth of the active region and the growth of one or both of the cladding regions, growing a graded layer which is formed so that one side of the graded layer is lattice matched with the adjacent active region and the other side of the graded layer is lattice matched with an adjacent cladding region and the graded layer has a constituency which is graded from the one side to the other side of the graded layer, in order to compensate for the lattice mismatching between the active region and at least one or both of the cladding regions, wherein the active region is grown at a first temperature while supplying a first constituent to the substrate surface, one or both of the cladding regions is grown at a second temperature while supplying a second constituent to the substrate surface, and the graded layer is grown by supplying at least one of the first and second constituents to the substrate surface while the substrate temperature is changed between the first and second temperatures, and wherein the second temperature is greater than the first temperature, and the graded layer is grown, after the growth of the active region and before the growth of the second cladding region, by supplying at least one of the first and second constituents to the substrate surface while the substrate temperature is ramped upward.