Patent ID: 6605829
Filing Date: 2003-08-12
Classification: H01L

Abstract:
A semiconductor device comprising:a silicon substrate of a first conduction type having first and second main surfaces facing each other; and an insulated gate type field effect transistor in which a main current flows between said first main surface and said second main surface, said insulated gate type field effect transistor comprising: a first impurity region of a second conduction type formed in said first main surface; a second impurity region of the first conduction type formed in said first impurity region; a first conduction type region in said silicon substrate extending between said first and second main surfaces, wherein said first impurity region is sandwiched between said first conduction type region and said second impurity region; a gate electrode layer facing said first impurity region with a gate insulating layer interposed therebetween; and a dielectric layer extending between said first and second main surfaces formed in said silicon substrate so as to be adjacent to said first conduction type region in said silicon substrate and made of a material having a dielectric constant higher than that of silicon.