Patent ID: 8748238
Filing Date: 2014-06-10
Classification: H01L

Abstract:
1. A silicon-germanium (SiGe) heterojunction bipolar transistor (HBT), comprising: a substrate; two trenches formed in the substrate, each of the trenches having an isolation structure formed therein; two pseudo buried layers, each being formed under a corresponding one of the trenches; a collector region formed between the isolation structures, each side of the collector region being connected with a corresponding one of the pseudo buried layers; and two SiGe field plates, each being formed on one of the isolation structures, wherein each of the pseudo buried layers is picked up via a first contact hole electrode formed in a corresponding isolation structure; each of the SiGe field plates is picked up via a second contact hole electrode formed thereon; and each second contact hole electrode is connected to its adjacent first contact hole electrode so that the two electrodes jointly serve as a collector.