Patent ID: 7180096
Filing Date: 2007-02-20
Classification: H01L

Abstract:
1. A GaN-based LED structure, comprising: a substrate made of a material selected from the group consisting of sapphire, 6H—SiC, 4H—SiC, Si, ZnO, GaAs, MgAl a buffer layer made of Al an n-type contact layer made of a GaN-based material located on top of said buffer layer; an active layer made of InGaN located on top of a part of said n-type contact layer's upper surface; a negative electrode located on top of another part of said n-type contact layer's upper surface not covered by said active layer; a p-type cladding layer made of a p-type GaN-based material located on top of said active layer; a p-type contact layer made of p-type GaN located on top of said p-type cladding layer; an anti-ESD thin layer made of a material selected from the group consisting of undoped InGaN, undoped AlInGaN having a band gap less than 3.4 eV, and a superlattice structure comprising undoped InGaN and undoped AlInGaN having a band gap less than 3.4 eV; a transparent conductive layer selected from the group consisting of a metallic conductive layer and a transparent oxide layer, located on top of a part of said anti-ESD thin layer's upper surface, wherein said metallic conductive layer is made of a material selected from the group consisting of Ni/Au alloy, Ni/Pt alloy, Ni/Pd alloy, Pd/Au alloy, Pt/Au alloy, Cr/Au alloy, Ni/Au/Be alloy, Ni/Cr/Au alloy, Ni/Pt/Au alloy, and Ni/Pd/Au alloy, and said transparent oxide layer is made of a material selected from the group consisting of ITO, CTO, ZnO:Al, ZnGa a positive electrode located on top of another part of said anti-ESD thin layer's upper surface not covered by said transparent conductive layer, made of a material selected from the group consisting of Ni/Au alloy, Ni/Pt alloy, Ni/Pd alloy, Ni/Co alloy, Pd/Au alloy, Pt/Au alloy, Ti/Au alloy, Cr/Au alloy, Sn/Au alloy, Ta/Au alloy, TiN, TiWN