Patent ID: 9461153
Filing Date: 2016-10-04
CPC Classification: H01L,H04M

Claim Text:
1. A metallization structure comprising: a selected semiconductor layer that includes wide bandgap semiconductor lattice-matched to gallium arsenide (GaAs) and that is part of an emitter of a heterojunction bipolar transistor (HBT), the emitter having a ledge that includes indium gallium phosphide (InGaP); a first GaAs layer underneath the selected semiconductor layer and that is part of a base of the HBT; a first metal layer disposed over and in electrical communication with the first GaAs layer, forming a base terminal of the HBT; a tantalum nitride (TaN) layer formed over the selected semiconductor layer; and a second metal layer formed over the TaN layer, forming an emitter terminal of the HBT, and having a portion covering the TaN layer that is nested within a region defined by a footprint of the first metal layer, the TaN layer arranged to separate the second metal layer from the selected semiconductor layer, and the TaN layer forming a barrier between the second metal layer and the selected semiconductor layer, the metallization structure forming a capacitor having a capacitance density of at least 2.0 fF/μm