Patent ID: 9059327
Filing Date: 2015-06-16
Classification: H01L

Abstract:
1. A nitride semiconductor Schottky diode comprising: a first layer including a first nitride semiconductor; a second layer provided on the first layer and including a second nitride semiconductor having a wider band gap than the first nitride semiconductor; an ohmic electrode provided on the second layer; and a Schottky electrode provided on the second layer, wherein the second layer has a thickness of 5 to 50 nm, the second layer includes a first portion beneath the ohmic electrode and in direct contact with the ohmic electrode, a second portion beneath the Schottky electrode and in direct contact with the Schottky electrode, and a third portion between the first portion and the second portion, only the third portion includes acceptors in the vicinity of the Schottky electrode, and the acceptors are distributed from a surface of the second layer to a depth less than a half thickness of the second layer, a region containing the acceptors in the third portion extends from an end on the Schottky electrode side to ½ or less of an interval between the Schottky electrode and the ohmic electrode, and the Schottky diode further comprises a passivation film provided between the ohmic electrode and the Schottky electrode on the second layer except for the region containing the acceptors.