Patent ID: 7375407

Claim:
A Schottky barrier diode comprising: a first semiconductor layer and a second semiconductor layer successively formed above a substrate; a high-resistance region formed in said first semiconductor layer and said second semiconductor layer and having higher resistance than said first semiconductor layer and said second semiconductor layer; and a Schottky electrode and an ohmic electrode spaced from each other and formed on said second semiconductor layer in a portion surrounded with said high-resistance region, wherein each of said first semiconductor layer and said second semiconductor layer is made of a compound represented by a general formula, In a Ga b Al c B d N, wherein 0≦a, b, c, d≦1 and a+b+c+d=1, said second semiconductor layer has a larger band gap than said first semiconductor layer, and said first semiconductor layer is undoped, and said high-resistance region is an impurity implanted region formed by implanting impurity ions into said first semiconductor layer and said second semiconductor layer and is not formed in the lowest part of said first semiconductor layer.