Patent ID: 6717185
Filing Date: 2004-04-06
Classification: H01L

Abstract:
A semiconductor structure for light emitting devices that can emit in the red to ultraviolet portion of the electromagnetic spectrum, said structure comprising:a silicon carbide substrate; a first cladding layer of AlxInyGa1âˆ’xâˆ’yN, where 0&lE;x&lE;1 and 0&lE;y<1 and (x+y)&lE;1; a second cladding layer of AlxInyGa1âˆ’xâˆ’yN, where 0&lE;x&lE;1 and 0&lE;y<1 and (x+y)&lE;1; an active layer of AlxInyGa1âˆ’xâˆ’yN, where 0&lE;x<1 and 0&lE;y&lE;1 and 0&lE;(x+y)&lE;1, wherein said first cladding layer is positioned between said silicon carbide substrate and said active layer, and said active layer is positioned between said first cladding layer and said second cladding layer; a first ohmic contact, wherein said silicon carbide substrate is positioned between said first ohmic contact and said first cladding layer; a second ohmic contact, wherein said second cladding layer is positioned between said second ohmic contact and said active layer; and a Group III nitride contact layer, wherein said contact layer is positioned between said second ohmic contact and said second cladding layer, and said contact layer and said second cladding layer have the same conductivity type; wherein said first and second cladding layers have respective bandgaps that are each larger than the bandgap of said active layer; and wherein at least one of the layers selected from the group consisting of said first cladding layer, said second cladding layer, and said active layer is characterized by the absence of gallium.