Patent ID: 7285857

Claim:
An electrode for a III-V group GaN-based compound semiconductor device, the electrode comprising: a first layer disposed on a III-V group nitride compound semiconductor layer and formed of a Zn-based material containing a solute, wherein an amount of the solute contained in the Zn-based material is in the range of about 0.1 to 49.9 atomic %; a second layer stacked on the first layer and formed of at least one selected from the group consisting of Co, Ir, Ta, Cr, Mn, Mo, Tc, W, Re, Fe, Sc, Sn, Ge, Sb, Al, ITO, ZITO, ZIO, GIO, ZTO, FTO, AZO, GZO, In 4 Sn 3 O 12 , and Zn 1-x Mg x O (0≦x≦1); and an intermediate layer interposed between the first layer and the second layer, the intermediate layer being formed of at least one selected from the group consisting of Co, Pd, Pt, Ru, Rh, Ir, Ta, Cr, Mn, Mo, Tc, W, Re, Fe, Sc, Ti, Sn, Ge, and Sb, wherein the intermediate layer is in contact with the first layer and the second layer.