Patent ID: 7573122
Filing Date: 2009-08-11
Classification: H01L

Abstract:
1. A semiconductor component having a metallic gate electrode on a semiconductor layer of semiconductor material on GaAs substrate, said gate electrode having a gate foot and a gate head and consisting of several layers when viewed in a direction perpendicular to a plane of the semiconductor layer, said layers comprising: a first layer (G 1 ) consisting of aluminum and having a first layer thickness (D 1 ) ;a second layer (G 2 ) on top of the first layer (G 1 ) and consisting of a second metal, different from aluminum; and at least one additional layer (G 3 ) formed above the second layer and consisting of an additional metal, different from the metal of the second layer, wherein the additional layer consists mostly or entirely of aluminum, and wherein an average grain size of the aluminum in the first layer is less than an average grain size of the aluminum in the additional layer.