FIELD-EFFECT TRANSISTOR, SINGLE-ELECTRON TRANSISTOR AND SENSOR USING THE SAME

A sensor capable of detecting detection targets that are necessary to be detected with high sensitivity is provided.It comprises a field-effect transistor 1A having a substrate 2, a source electrode 4 and a drain electrode 5 provided on said substrate 2, and a channel 6 forming a current path between said source electrode 4 and said drain electrode 5;