Patent ID: 7285800
Filing Date: 2007-10-23
Classification: H01L

Abstract:
1. A light-emitting gallium nitride-based III-V group compound semiconductor device with high light extraction efficiency, comprising: a substrate, a buffer layer formed on said substrate, said substrate and said buffer layer having a concave and/or convex contoured contact interface formed therebetween and continually and uninterruptibly extending across substantially the entire surface of said substrate and said buffer layer; a semiconductor stacked structure arranged over said substrate, defining: a first gallium nitride-based III-V group compound semiconductor layer, a second gallium nitride-based III-V group compound semiconductor layer arranged over said first gallium nitride-based III-V group compound semiconductor layer, and a light-emitting layer sandwiched between said first and second gallium nitride-based III-V group compound semiconductor layers; a texturing surface layer of AlInGaNPAs formed during the epitaxial growth on said second gallium nitride-based III-V group compound semiconductor layer for reducing a contact resistance therewith and thereby reducing an operating voltage of said semiconductor device; a transparent conductive window layer arranged on said texturing surface layer and establishing an ohmic contact with said texturing surface layer, said texturing surface layer being sandwiched between said second gallium nitride-based III-V group compound semiconductor layer and said transparent conductive window; a first electrode provided in electrical contact with said first gallium nitride-based III-V group compound semiconductor layer of said semiconductor stacked structure; and a second electrode arranged directly on said texturing surface layer in lateral disposition with said transparent conductive window layer, said second electrode forming an electrical contact with said transparent conductive window layer and said texturing surface layer.