Effects of buried oxide layer on working speed of SiGe heterojunction photo-transistor
Liu Xian-Cheng1, Ma Jia-Jun1, Xie Hong-Yun1, †, Ma Pei1, Chen Liang2, Guo Min1, Zhang Wan-Rong1
       

Curve of ft,opt versus collector current for SOI-based SiGe HPT and for Si-based SiGe HPT.