Patent ID: 9698235
Date: 2017-07-04
CPC Classifications: H01L

Claim:
1. A field-effect transistor of an accumulation-layer-operation type, comprising: a semiconductor layer in which a source region, a channel region, and a drain region that have either an N-type or P-type conductivity in common are formed; and a gate electrode disposed adjacent to the channel region via a gate insulating film, wherein the gate insulating film is made of a dielectric having a change gradient of a relative dielectric constant in which the relative dielectric constant changes to decrease according to a magnitude of a gate voltage applied to the gate electrode; and wherein the dielectric has the change gradient of the relative dielectric constant in which when the gate voltage is modulated by 0.5 V, the relative dielectric constant becomes lower than or equal to a 0.5-times of the relative dielectric constant before modulation.