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High-Responsivity Photovoltaic Photodetectors Based on MoTe2/MoSe2 van der Waals Heterojunctions

State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China
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Crystals 2019, 9(6), 315; https://doi.org/10.3390/cryst9060315
Received: 4 June 2019 / Revised: 16 June 2019 / Accepted: 17 June 2019 / Published: 19 June 2019
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Abstract

Van der Waals heterojunctions based on transition metal dichalcogenides (TMDs) show promising potential in optoelectronic devices, due to the ultrafast separation of photoexcited carriers and efficient generation of the photocurrent. Herein, this study demonstrated a high-responsivity photovoltaic photodetector based on a MoTe2/MoSe2 type-II heterojunction. Due to the interlayer built-in potential, the MoTe2/MoSe2 heterojunction shows obvious photovoltaic behavior and its photoresponse can be tuned by the gate voltage due to the ultrathin thickness of the heterojunction. This self-powered photovoltaic photodetector exhibits an excellent responsivity of 1.5 A W−1, larger than previously reported TMDs-based photovoltaic photodetectors. Due to the high-efficiency separation of electron-hole pairs and ultrafast charge transfer, the light-induced on/off ratio of current switching is larger than 104 at zero bias, and the dark current is extremely low (~10−13 A). These MoTe2/MoSe2 type-II heterojunctions are expected to provide more opportunities for future nanoscale optoelectronic devices. View Full-Text
Keywords: MoTe2; MoSe2; van der Waals heterojunction; photovoltaic photodetector; responsivity; detectivity MoTe2; MoSe2; van der Waals heterojunction; photovoltaic photodetector; responsivity; detectivity
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Luo, H.; Wang, B.; Wang, E.; Wang, X.; Sun, Y.; Liu, K. High-Responsivity Photovoltaic Photodetectors Based on MoTe2/MoSe2 van der Waals Heterojunctions. Crystals 2019, 9, 315.

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