Broadband photodetection of MoS2/p-Ge/n-Ge bipolar heterojunction phototransistor

MoS
2
/p-Ge/n-Ge bipolar heterojunction phototransistor is fabricated, which can detect from VIS to NIR. The responsivities are 35.21 and 133.56 A/W at 466 and 1550 nm, respectively. Photocurrent amplification of BHP, 6 times larger than photocurrent of p-Ge/n-Ge and p-Ge/MoS
2
photodiodes.