Patent ID: 7144765
Filing Date: 2006-12-05
Classification: H01L

Abstract:
1. A method of manufacturing a semiconductor device which is a pseudomorphic high electron mobility transistor, said method comprising: stacking layers sequentially on a semi-insulating GaAs substrate by epitaxial growth, the layers including, sequentially, a GaAs buffer layer, an AlGaAs buffer layer, an undoped InGaAs channel layer, a first undoped AlGaAs spacer layer, a carrier supply layer, a second undoped AlGaAs spacer layer, an undoped InGaP Schottky layer, and a doped GaAs cap layer; forming a drain electrode and a source electrode on the doped GaAs cap layer so that the drain electrode and the source electrode are in ohmic contact with the doped GaAs cap layer; and forming a gate electrode on the undoped InGaP Schottky layer so that the gate electrode extends through the doped GaAs cap layer, the gate electrode being composed of a material having La and B as main constituents.