Patent ID: 6872967

Claim:
A method of manufacturing a nitride-based semiconductor device, comprising the steps of: forming a first group III nitride-based semiconductor layer including gallium on a substrate; forming at least one set of layered structures including a super lattice multi-layer film and a second group III nitride-based semiconductor layer in this order on said first group III nitride-based semiconductor layer; and forming a third group III nitride-based semiconductor layer having a device region on said at least one set of layered structures, said step of forming said at least one set of layered structures comprising the step of forming said super lattice multi-layer film by forming at least one pair of first and second films alternately layered on one another, said step of forming said super lattice multi-layer film comprising the step of ensuring that the lowermost layer of said super lattice multi-layer film is said first film, said first film being made of a group III nitride-based semiconductor including at least indium and gallium and having a first lattice constant, and said second film being made of a group III nitride-based semiconductor including at least aluminum and gallium and having a second lattice constant different from said first lattice constant.