Patent ID: 9018679
Filing Date: 2015-04-28
Classification: H01L

Abstract:
1. A semiconductor device comprising: an operation layer that is provided on a substrate and is made of a GaAs-based semiconductor; a first AlGaAs layer provided on the operation layer; a gate electrode provided on the first AlGaAs layer; an second AlGaAs layer having n-type conductivity and provided on the first AlGaAs layer of both sides of the gate electrode, an Al composition ratio of the second AlGaAs layer being larger than that of the first AlGaAs layer and being more than 0.3 and equal to or less than 0.5; an n-type GaAs layer selectively provided on the second AlGaAs layer; and a source electrode and a drain electrode that contain Au and are provided on the n-type GaAs layer, wherein; the second AlGaAs layer directly contacts with the first AlGaAs layer; the n-type GaAs layer directly contacts with the second AlGaAs layer; and the gate electrode directly contacts with the first AlGaAs layer.