Patent ID: 6114727
Filing Date: 2000-09-05
Classification: H01L

Abstract:
A semiconductor device comprising:a high-resistance first-conductivity-type base layer;a first-conductivity-type drain layer formed on one surface of the first-conductivity-type base layer;a second-conductivity-type base layer formed at the other surface of the first-conductivity-type base layer;a first-conductivity-type source layer formed at one surface of the second-conductivity-type base layer;a second-conductivity-type injection layer formed at said other surface of the first-conductivity-type base layer in a region different from a region where the second-conductivity-type base layer is formed;a trench formed at said other surface of the first-conductivity-type base layer between the second-conductivity-type base layer and the second-conductivity-type injection layer so as to extend from a surface of the first-conductivity-type source layer through the second-conductivity-type base layer into the first-conductivity-type base layer, the trench serving as a carrier barrier between the second-conductivity-type injection layer and the first-conductivity-type source layer;a first gate electrode buried in the trench with an insulating film interposed;a first main electrode formed on the first-conductivity-type drain layer;a second main electrode formed on the first-conductivity-type source layer; anda second gate electrode formed on the second-conductivity-type injection layer.