Patent ID: 7193246
Filing Date: 2007-03-20
Classification: B82Y,H01L,H01S

Abstract:
1. A nitride semiconductor device comprising: an n-region layer structure including a first n-region multi-film layer composed by subsequently growing three films including a lower film made of an undoped nitride semiconductor, an inter-film made of a nitride semiconductor doped with an n-type impurity and an upper layer made of an undoped nitride semiconductor, said lower film having a thickness in the range of 500 through 8000 angstroms, and said inter-film having a thickness in the range of 150 through 400 angstroms; a p-region layer structure including a p-region multi-film cladding layer having at least one first nitride semiconductor film and at least one second nitride semiconductor film, said at least one second nitride semiconductor film having a different bandgap than said at least one first nitride semiconductor film, at least one of said at least one first and second nitride semiconductor films being doped with a p-type impurity; and an active layer interposed between said n-region and p-region layer structures, said active layer having a multiple quantum well structure including In wherein said n-region layer structure further includes an n-contact layer containing the n-type impurity, wherein said first n-region multi-film layer is interposed between said n-contact layer and said active layer.