InAIAs/InGaAs heterojunction bipolar transistors (HBT's) grown by molecular beam epitaxy (MBE) are fabricated. A cutoff frequency of 32 GHz for a collector current of 20 mA is achieved in the emitter area of 6 x μ 10-m2 devices. The use of heavily doped and nondoped InGaAs layers as the emitter cap and collector, respectively, results in a reduction of the emitter and collector charging times; this, in turn, leads to the higher microwave performance of devices.
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Electrical and Electronic Engineering