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Reverse dark current in organic photodetectors and the major role of traps as source of noise

Author

Listed:
  • Jonas Kublitski

    (Technische Universität Dresden)

  • Andreas Hofacker

    (Technische Universität Dresden)

  • Bahman K. Boroujeni

    (Technische Universität Dresden
    Technische Universität Dresden)

  • Johannes Benduhn

    (Technische Universität Dresden)

  • Vasileios C. Nikolis

    (Technische Universität Dresden
    Heliatek GmbH)

  • Christina Kaiser

    (Swansea University)

  • Donato Spoltore

    (Technische Universität Dresden)

  • Hans Kleemann

    (Technische Universität Dresden)

  • Axel Fischer

    (Technische Universität Dresden)

  • Frank Ellinger

    (Technische Universität Dresden
    Technische Universität Dresden)

  • Koen Vandewal

    (Hasselt University)

  • Karl Leo

    (Technische Universität Dresden
    Technische Universität Dresden)

Abstract

Organic photodetectors have promising applications in low-cost imaging, health monitoring and near-infrared sensing. Recent research on organic photodetectors based on donor–acceptor systems has resulted in narrow-band, flexible and biocompatible devices, of which the best reach external photovoltaic quantum efficiencies approaching 100%. However, the high noise spectral density of these devices limits their specific detectivity to around 1013 Jones in the visible and several orders of magnitude lower in the near-infrared, severely reducing performance. Here, we show that the shot noise, proportional to the dark current, dominates the noise spectral density, demanding a comprehensive understanding of the dark current. We demonstrate that, in addition to the intrinsic saturation current generated via charge-transfer states, dark current contains a major contribution from trap-assisted generated charges and decreases systematically with decreasing concentration of traps. By modeling the dark current of several donor–acceptor systems, we reveal the interplay between traps and charge-transfer states as source of dark current and show that traps dominate the generation processes, thus being the main limiting factor of organic photodetectors detectivity.

Suggested Citation

  • Jonas Kublitski & Andreas Hofacker & Bahman K. Boroujeni & Johannes Benduhn & Vasileios C. Nikolis & Christina Kaiser & Donato Spoltore & Hans Kleemann & Axel Fischer & Frank Ellinger & Koen Vandewal , 2021. "Reverse dark current in organic photodetectors and the major role of traps as source of noise," Nature Communications, Nature, vol. 12(1), pages 1-9, December.
  • Handle: RePEc:nat:natcom:v:12:y:2021:i:1:d:10.1038_s41467-020-20856-z
    DOI: 10.1038/s41467-020-20856-z
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    Cited by:

    1. Riccardo Ollearo & Junke Wang & Matthew J. Dyson & Christ H. L. Weijtens & Marco Fattori & Bas T. Gorkom & Albert J. J. M. Breemen & Stefan C. J. Meskers & René A. J. Janssen & Gerwin H. Gelinck, 2021. "Ultralow dark current in near-infrared perovskite photodiodes by reducing charge injection and interfacial charge generation," Nature Communications, Nature, vol. 12(1), pages 1-9, December.
    2. Chiara Labanti & Jiaying Wu & Jisoo Shin & Saurav Limbu & Sungyoung Yun & Feifei Fang & Song Yi Park & Chul-Joon Heo & Younhee Lim & Taejin Choi & Hyeong-Ju Kim & Hyerim Hong & Byoungki Choi & Kyung-B, 2022. "Light-intensity-dependent photoresponse time of organic photodetectors and its molecular origin," Nature Communications, Nature, vol. 13(1), pages 1-10, December.
    3. Aniket Rana & Song Yi Park & Chiara Labanti & Feifei Fang & Sungyoung Yun & Yifan Dong & Emily J. Yang & Davide Nodari & Nicola Gasparini & Jeong–Il Park & Jisoo Shin & Daiki Minami & Kyung-Bae Park &, 2024. "Octupole moment driven free charge generation in partially chlorinated subphthalocyanine for planar heterojunction organic photodetectors," Nature Communications, Nature, vol. 15(1), pages 1-10, December.

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