Patent ID: 6426523
Filing Date: 2002-07-30
Classification: H01L

Abstract:
A field effect transistor, comprising:a channel layer formed of undoped InGaAs; a first undoped AlGaAs layer disposed on said channel layer; a first doped AlGaAs layer disposed on said first undoped AlGaAs layer; a second undoped AlGaAs layer disposed on said first doped AlGaAs layer, wherein said second undoped AlGaAs layer has a first end, a second end, and a gate electrode forming portion disposed between said first end and said second end; a first portion of an undoped GaAs layer disposed on said first end of said second undoped AlGaAs layer, and a second portion of said undoped GaAs layer disposed on said second end of said second undoped AlGaAs layer, wherein a first distance separates said first portion of said undoped GaAs layer from said second portion of said undoped GaAs layer; a first portion of a third undoped AlGaAs layer disposed on said first portion of said undoped GaAs layer, and a second portion of said third undoped AlGaAs layer disposed on said second portion of said undoped GaAs layer, wherein a second distance separates said first portion of said third undoped AlGaAs layer from said second portion of said third undoped AlGaAs layer; a first portion of an n-type GaAs layer disposed on said first portion of said third undoped AlGaAs layer, and a second portion of said n-type GaAs layer disposed on said second portion of said third undoped AlGaAs layer, wherein a third distance separates said first portion of said n-type GaAs layer from said second portion of said n-type GaAs layer; a first ohmic electrode disposed on said first portion of said n-type GaAs layer, and a second ohmic electrode disposed on said second portion of said n-type GaAs layer, wherein a fourth distance separates said first ohmic electrode from said second ohmic electrode.