Patent ID: 7495314

Claim:
An ohmic contact comprising: a layer of p-type GaN-based material; a first layer of p-type group II-VI compound semiconductor material comprising a first group VI element, the first layer located adjacent to the layer of p-type GaN-based material; a layer of metal configured to provide a metal contact; a second layer of p-type group II-VI compound semiconductor material comprising a second group VI element different than the first group VI element, the second layer located adjacent to the layer of metal; and a p-type semiconductor stack sandwiched between the first layer and the second layer, the p-type semiconductor stack comprising: a third layer of p-type group II-VI compound semiconductor material comprising the first group VI element and excluding the second group VI element; and a fourth layer of p-type group II-VI compound semiconductor material located adjacent the third layer, the fourth layer comprising the second group VI element and excluding the first group VI element.