Patent ID: 8541817

Claim:
A high breakdown voltage semiconductor device comprising: a substrate; a Al a Ga 1-a N layer on said substrate wherein 0.1≦a≦1.00; a GaN layer on said Al a Ga 1-a N layer; a In 1-b Ga b N/GaN channel layer on said GaN layer wherein 0.1≦b≦1.00; an Al c In d Ga 1-c-d N spacer layer on said In 1-b Ga b N/GaN layer wherein 0.1≦c≦1.00 and 0.0≦d≦0.99; a Al e In 1-e N nested superlattice barrier layer on said Al c In d Ga 1-c-d N spacer layer wherein 0.10≦e≦0.99; a Al f In g Ga 1-f-g N leakage suppression layer over on said Al e In 1-e N barrier layer wherein 0.1≦f≦0.99 and 0.1≦g≦0.99 wherein said leakage suppression layer decreases leakage current and increases breakdown voltage during high voltage operation; and a superstructure on said Al f In g Ga 1-f-g N leakage suppression layer.