Patent ID: 8581301
Filing Date: 2013-11-12
Classification: H01L,H02M

Abstract:
1. A nitride semiconductor device comprising: an electroconductive substrate; a first nitride semiconductor layer provided directly on an upper surface of the electroconductive substrate or provided on the upper surface of the electroconductive substrate through a buffer layer and including a non-doped nitride semiconductor; a second nitride semiconductor layer provided on the first nitride semiconductor layer and including a non-doped or n-type nitride semiconductor having a band gap wider than that of the first nitride semiconductor layer; a first heterojunction field effect transistor having a first source electrode provided on the second nitride semiconductor layer and forming an ohmic connection with the second nitride semiconductor layer, a first drain electrode provided on the second nitride semiconductor layer and forming an ohmic connection with the second nitride semiconductor layer, and a first gate electrode provided between the first source electrode and the first drain electrode and controlling a concentration of a two-dimensional electron gas generated on an interface between the first nitride semiconductor layer and the second nitride semiconductor layer; a first Schottky barrier diode having a first anode electrode provided on the second nitride semiconductor layer, forming a Schottky connection with the second nitride semiconductor layer, and electrically connected to the first drain electrode, and having a first cathode electrode provided on the second nitride semiconductor layer and forming an ohmic connection with the second nitride semiconductor layer; a first element isolation insulating layer provided from an upper surface of the second nitride semiconductor layer to an intermediate portion of the first nitride semiconductor layer between the first drain electrode and the first anode electrode; a second element isolation insulating layer provided from the upper surface of the second nitride semiconductor layer to an intermediate portion of the first nitride semiconductor layer between the first source electrode and the first cathode electrode; and a frame electrode electrically connected to the first source electrode and the electroconductive substrate and surrounding outer peripheries of the first heterojunction field effect transistor and the first Schottky barrier diode.