Patent ID: 6399970
Filing Date: 2002-06-04
Classification: H01L

Abstract:
A semiconductor device comprising a heterojunction field-effect transistor which is formed on a semiconductor substrate,wherein a channel region of said heterojunction field-effect transistor comprises: a Si layer; a Si1-x-yGexCy layer (01-x-yGexCy layer is 0.25% or less; and a carrier accumulation layer formed in a portion of a heterointerface between said Si layer and said Si1-x-yGexCy layer, which portion is included in said Si1-x-yGexCy layer and adjacent to said Si layer, said carrier accumulation layer confining negative carriers; a carrier supply layer for supplying carriers to said carrier accumulation layer which is formed in that portion of said Si layer which is adjacent to said Si1-x-yGexCy; a gate insulating film formed on or above the Si1-x-yGexCy layer; and a gate electrode formed on the gate insulating film.