Patent ID: 8896084

Claim:
A semiconductor device comprising: a first semiconductor region of a first conductivity type and formed of a material having a band gap wider than a band gap of silicon; a first layer selectively disposed on a surface of the first semiconductor region and forming a first junction with the first semiconductor region; a second layer selectively disposed on the surface of the first semiconductor region and forming a second junction with the first semiconductor region; a first diode formed by a region that includes the first junction; a second diode formed by a region that includes the second junction; an electrode film is formed over the first layer and the second layer, the electrode film is electrically connected to the first diode and the second diode; and a fourth semiconductor region of a second conductivity type and disposed in a surface of the first semiconductor region, between the first junction and the second junction, contacting the first junction and the second junction, wherein a recess and an elevated portion that protrudes more than a bottom aspect of the recess are disposed on the surface of the first semiconductor region, the first junction and the second junction are formed at different depths from the surface of the first semiconductor region, and a built-in potential of the second diode is lower than a built-in potential of the first diode.