Patent ID: 7626232

Claim:
A voltage-controlled semiconductor device, comprising: a first semiconductor layer made of a first conductivity-type wide gap semiconductor having a first electrode on one surface, the first electrode becoming either one of a current inflow terminal and a current outflow terminal for a controlled current; a second semiconductor layer made of a wide gap semiconductor which is formed on the other surface of the first semiconductor layer and which has a second conductivity-type different from the first conductivity type; an embedded semiconductor region made of a wide gap semiconductor which is partially provided in a vicinity of an opposite surface of the second semiconductor layer to a surface being in contact with the first semiconductor layer and which has a conductivity type different from that of the second semiconductor layer; a channel layer made of a wide gap semiconductor which is provided so as to be in contact with the second semiconductor layer and the embedded semiconductor region and which has a conductivity type identical to that of the second semiconductor layer; a semiconductor region made of a wide gap semiconductor which is provided in the channel layer so as to be overlapped with the embedded semiconductor region and which has a conductivity type identical to that of the channel layer and a dopant concentration larger than that of the channel layer; a second electrode electrically connected to the embedded semiconductor region and to the semiconductor region, the second electrode becoming a current outflow end when the first semiconductor layer becomes a current inflow end while the second electrode becoming a current inflow end when the first semiconductor layer becomes a current outflow end; and a control electrode facing the channel layer and the semiconductor region via an insulating film.