MoTe2-based 2D avalanche photodetector with low dark current

Tenghui Ouyang; Chen Huanjun

doi:10.1117/12.2575319

10 October 2020 MoTe₂-based 2D avalanche photodetector with low dark current

Tenghui Ouyang, Chen Huanjun

Proceedings Volume 11556, Nanophotonics and Micro/Nano Optics VI; 115560Y (2020) https://doi.org/10.1117/12.2575319
Event: SPIE/COS Photonics Asia, 2020, Online Only

Conference Poster

Abstract

Two-dimensional (2D)-material-based photodetectors have recently received great attention due to their potential as ultrathin and ultra-highly integrated devices. In this study, we demonstrated the application of MoTe2 as electrode material for photodetectors. An all-2D photodetector based on WS2 and MoTe2 is fabricated. Owing to the large Schottky barrier formed between WS2 and MoTe2, the avalanche eﬀect can be realized because a large electrical ﬁeld can be applied across the MoTe2–WS2–MoTe2 junctions before breakdown. Additionally, because of the existence of Schottky barrier, the dark current of device is greatly reduced. As a result, we achieved the enhanced performance of the ultrathin all-2D photodetector, with a photoresponsivity of 6.02 AW-1, an external quantum eﬃciency of 1406%, an avalanche gain of 587, and a low dark current of 93 pA in the broadband spectrum range from visible-to-NIR wavelengths.

Citation Download Citation

Tenghui Ouyang and Chen Huanjun "MoTe₂-based 2D avalanche photodetector with low dark current", Proc. SPIE 11556, Nanophotonics and Micro/Nano Optics VI, 115560Y (10 October 2020); https://doi.org/10.1117/12.2575319

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