Patent ID: 6809346
Filing Date: 2004-10-26
Classification: H01L,H01S

Abstract:
A boron-phosphide-based semiconductor light-emitting device comprising a semiconductor substrate of a first conduction type having, on its bottom surface, a bottom electrode; a first boron-phosphide-based semiconductor layer of a first conductive type provided on the substrate; a Group III-V compound semiconductor light-emitting layer provided on the first boron-phosphide-based semiconductor layer; a second boron-phosphide-based semiconductor layer of a second conductive type provided on the active layer; and a top electrode provided on the top surface of the second boron-phosphide-based semiconductor layer, whereineach of the boron-phosphide-based semiconductor layers serves as a cladding layer for the light-emitting layer, the cladding layer is formed of a boron-phosphide-based semiconductor whose band gap is larger at least than that of the light-emitting layer by 0.2 eV to 0.3 eV, the top electrode includes a lower electrode and an upper electrode, the lower electrode is in direct contact with the second boron-phosphide-based semiconductor layer and formed of a metal incapable of establishing ohmic contact with the second boron-phosphide-based semiconductor layer, and the upper electrode is provided on the lower electrode and formed of a metal capable of establishing ohmic contact with the second boron-phosphide-based semiconductor layer, wherein a portion of the upper electrode is in contact with the surface of the second boron-phosphide-based semiconductor layer.