Patent ID: 7618851
Filing Date: 2009-11-17
Classification: H01L

Abstract:
1. A method for the production of a microelectronic component of a T-shaped metallic gate electrode, having a gate head and a gate foot that is narrower than the gate head, which is disposed in a double-recess structure, comprising the following steps: depositing a semiconductor layer sequence for an HEMT transistor, said sequence comprising: depositing at least one first auxiliary layer above the contact layer; producing a first opening that determines the structure of the gate foot in the first auxiliary layer; producing a broad recess of the double-recess structure by under-etching the auxiliary layer up to the shielding layer; depositing dielectric material for another auxiliary layer onto the shielding layer through the first opening; producing a second opening in the additional auxiliary layer, up to the shielding layer, by anistropic etching, with the first opening as a mask; producing a narrow recess of the double-recess structure by under-etching the additional auxiliary layer on both sides of the second opening; and depositing gate metal for the gate foot through the second opening into the narrow recess.