Patent ID: 7459788
Filing Date: 2008-12-02
Classification: H01L

Abstract:
1. An ohmic electrode structure of a nitride semiconductor device having a nitride semiconductor, comprising: a first metal film formed on the nitride semiconductor, and a second metal film formed on the first metal film, wherein the first metal film is made of at least one material selected from the group consisting of V, Mo, Ti, Nb, W, Fe, Hf, Re, Ta, and Zr, and the second metal film is made of at least one material that is different from that of the first metal film and selected from the group consisting of V, Mo, Ti, Nb, W, Fe, Hf, Re, Ta, Zr, Pt, and Au, excluding; a combination of V as the first metal film and Pt or Au as the second metal film, a combination of Ti as the first metal film and Mo, Pt or Au as the second metal film, a combination of W as the first metal film and Pt or Au as the second metal film, a combination of Hf as the first metal film and Au as the second metal film, and a combination of Zr as the first metal film and Pt or Au as the second metal film.