Patent ID: 7230275

Claim:
A silicon carbide semiconductor device comprising: a substrate made of silicon carbide and having a first conductive type; and a junction field effect transistor disposed on the substrate, wherein the junction field effect transistor includes: a first semiconductor layer disposed on the substrate, having the first conductive type, and made of silicon carbide with a low impurity concentration lower than the substrate; a first gate layer having a second conductive type, disposed on a surface of the first semiconductor layer, and made of silicon carbide; a first channel layer having the first conductive type and disposed adjacent to the first gate layer in a planar direction on the substrate, the first channel layer having an impurity concentration higher than the first semiconductor layer; a first source layer having the first conductive type, having a high impurity concentration higher than the first channel layer, and connecting to the first channel layer electrically; a second gate layer having the second conductive type, disposed adjacent to the first channel layer, and being opposite to the first gate layer to sandwich the first channel layer; a second channel layer having the first conductive type, disposed adjacent to the second gate layer, and being opposite to the first channel layer to sandwich the second gate layer; a third gate layer disposed adjacent to the second channel layer and being opposite to the second gate layer to sandwich the second channel layer; and a second source layer having the first conductive type, having a high impurity concentration higher than the second channel layer, and connecting to the second channel layer electrically.