Patent ID: 6995397
Filing Date: 2006-02-07
Classification: H01L

Abstract:
1. A semiconductor device comprising: a semiconductor substrate; a semiconductor region of a first conductivity type formed in at least a part of the semiconductor substrate; a modulation-doped channel layer formed on the first-conductivity-type semiconductor region, having a non-uniform impurity concentration distribution, and being of a second conductivity type; a gate insulating film formed on the channel layer; a gate electrode formed on the gate insulating film; and a source layer of the second conductivity type formed in the first-conductivity-type semiconductor region so as to be located laterally with respect to the gate electrode, wherein given that y is depth into the channel layer from the surface thereof; N(y), a function of the depth y, is the impurity concentration of the channel layer in the depth direction; N the channel layer is configured to satisfy the following equation: where T