Patent ID: 6919589
Filing Date: 2005-07-19
Classification: H01L

Abstract:
1. A semiconductor device comprising: a GaAs substrate; a buffer layer provided on the GaAs substrate, the buffer layer being made of a semiconductor, and at least a part of the semiconductor having a lattice constant larger than a lattice constant of GaAs; a channel layer provided on the buffer layer, and being made of In an electron supply layer provided on or under the channel layer, and being made of n-type In a Schottky contact layer provided on the channel layer and the electron supply layer, at least a part of the Schottky contact layer being made of non-doped In a n-type In a n-type In a gate electrode provided on the Schottky contact layer; and a source electrode and a drain electrode provided on the ohmic contact layer, wherein the Schottky contact layer has a non-doped InAlAs layer and an AlGaAs layer provided thereon.