Patent ID: 6020604
Filing Date: 2000-02-01
Classification: H01L

Abstract:
A compound semiconductor device comprising:a semi-insulating GaAs substrate;an electron transit layer of an InGaAs layer formed on the substrate;a mitigation layer formed on the electron transit layer, and being an AlGaInAs layer; anda barrier layer formed on the mitigation layer, being an AlGaAs layer, and having a higher Al composition ratio than the mitigation layer;wherein the mitigation layer is an (Al.sub.x Ga.sub.1-x).sub.y In.sub.1-y As layer which has an Al composition ratio x above 0.1 and below 0.5, and an In composition ratio y is above 0.9 and below 1.0, andthe barrier layer is an Al.sub.x Ga.sub.1-x As layer which has an Al composition ratio x above 0.4 and below 0.8.