Patent ID: 6724025
Filing Date: 2004-04-20
Classification: H01L

Abstract:
A semiconductor device comprising:a channel of a first conductivity type formed on a surface layer of a semiconductor substrate; a source and a drain of a second conductivity type formed on both sides of the channel; a gate insulation film with a first relative permittivity formed at least on said channel directly or through a buffer insulation film; a gate electrode formed on said gate insulation film; and a side insulation film formed at least on a side of said gate insulation film and having a second relative permittivity which is smaller than the first relative permittivity, wherein when a first length, which is a length of the gate insulation film adjacent to said surface layer on the gate electrode side along a channel length direction, is L1, a second length, which is a length of the gate insulation film adjacent to said surface layer on said channel side along the channel length direction, is L2, and a third length, which is a length of a bottom part of said gate electrode parallel to the channel length direction, is L3, the length L1 is longer than the length L2, and the length L3 is longer than the length L1.