Patent ID: 8519452

Claim:
A semiconductor device with a junction field-effect transistor, the semiconductor device comprising: a junction field-effect transistor including: a base that has a principal surface, is made of a semiconductor material, and has a first conductivity type; a drift layer that is arranged above the base, is configured as an epitaxial layer, and has the first conductivity type; a semiconductor layer that is arranged above the drift layer and has a second conductivity type; a source layer that is arranged above the semiconductor layer, has the first conductivity type, and has an impurity concentration larger than the drift layer; a first trench that penetrates through the source layer and the semiconductor layer into the drift layer; a channel layer that is arranged in the first trench and has the first conductivity type; a top gate layer that is arranged on a surface of the channel layer in the first trench, and has the second conductivity type; a first gate wire that is electrically connected to the top gate layer; a second gate wire that is electrically connected to an embedded gate layer, wherein the embedded gate layer is a part of the semiconductor layer adjoining the channel layer; a source electrode that is electrically connected to the source layer; and a drain electrode that is electrically connected to a rear surface of the substrate, a second trench that penetrates through the source layer into the embedded gate layer; and a contact embedded layer that completely fills the second trench, and has the second conductivity type, wherein: the second gate wire is connected to the contact embedded layer, so that the second gate wire is connected to the embedded gate layer via the contact embedded layer.