Patent ID: 6037615
Filing Date: 2000-03-14
Classification: H01L

Abstract:
A metal-semiconductor field effect transistor comprising:an AlGaAs buffer layer made of Al.sub.x Ga.sub.1-x As wherein 0<x<0.4;a channel layer made of an n-type doped In.sub.y Gal-YAs, wherein 0<y<0.4, having a thickness equal to or less than a critical thickness for lattice-matching with GaAs; anda doped AlGaAs layer interposed between said AlGaAs buffer layer and said channel layer, said doped AlGaAs layer made of Al.sub.x Ga.sub.1-x As, wherein 0<x<0.4, doped with Si of a concentration of 5*10.sup.17 cm.sup.-3 or more, and having a thickness which is sufficient to provide a barrier against holes caused by a donor depletion region.