Patent ID: 6717192
Filing Date: 2004-04-06
Classification: H01L

Abstract:
A Schottky gate field effect transistor (FET) comprising:a semi-insulating substrate; a channel layer overlying the semi-insulating substrate; a source contact layer and a drain contact layer formed on the channel layer and having a recess formed by removing part of the contact layers; a gate electrode formed over the recess and being in Schottky contact with the channel layer; a source electrode and a drain electrode in ohmic contact with the source contact layer and the drain contact layer, respectively; and a dielectric film formed between the gate electrode and the drain electrode, wherein the gate electrode includes a gate extension which is in contact with the dielectric film and extend to overlie at least part of the drain electrode and the drain contact layer, wherein the gate extension is 3.0 &mgr;m or above apart from an end of the drain electrode near to the gate electrode.