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Light-intensity-dependent photoresponse time of organic photodetectors and its molecular origin

Author

Listed:
  • Chiara Labanti

    (Imperial College London
    Imperial College London)

  • Jiaying Wu

    (Imperial College London
    Imperial College London
    The Hong Kong University of Science and Technology, Nansha
    The Hong Kong University of Science and Technology)

  • Jisoo Shin

    (Samsung Advanced Institute of Technology, Samsung Electronics Co. Ltd., Samsung-ro, Yeongtong-gu)

  • Saurav Limbu

    (Imperial College London
    Imperial College London)

  • Sungyoung Yun

    (Samsung Advanced Institute of Technology, Samsung Electronics Co. Ltd., Samsung-ro, Yeongtong-gu)

  • Feifei Fang

    (Samsung Advanced Institute of Technology, Samsung Electronics Co. Ltd., Samsung-ro, Yeongtong-gu)

  • Song Yi Park

    (Imperial College London
    Imperial College London)

  • Chul-Joon Heo

    (Samsung Advanced Institute of Technology, Samsung Electronics Co. Ltd., Samsung-ro, Yeongtong-gu)

  • Younhee Lim

    (Samsung Advanced Institute of Technology, Samsung Electronics Co. Ltd., Samsung-ro, Yeongtong-gu)

  • Taejin Choi

    (Samsung Advanced Institute of Technology, Samsung Electronics Co. Ltd., Samsung-ro, Yeongtong-gu)

  • Hyeong-Ju Kim

    (Samsung Advanced Institute of Technology, Samsung Electronics Co. Ltd., Samsung-ro, Yeongtong-gu)

  • Hyerim Hong

    (Samsung Advanced Institute of Technology, Samsung Electronics Co. Ltd., Samsung-ro, Yeongtong-gu)

  • Byoungki Choi

    (Samsung Advanced Institute of Technology, Samsung Electronics Co. Ltd., Samsung-ro, Yeongtong-gu)

  • Kyung-Bae Park

    (Samsung Advanced Institute of Technology, Samsung Electronics Co. Ltd., Samsung-ro, Yeongtong-gu)

  • James R. Durrant

    (Imperial College London
    Imperial College London)

  • Ji-Seon Kim

    (Imperial College London
    Imperial College London)

Abstract

Organic photodetectors (OPDs) exhibit superior spectral responses but slower photoresponse times compared to inorganic counterparts. Herein, we study the light-intensity-dependent OPD photoresponse time with two small-molecule donors (planar MPTA or twisted NP-SA) co-evaporated with C60 acceptors. MPTA:C60 exhibits the fastest response time at high-light intensities (>0.5 mW/cm2), attributed to its planar structure favoring strong intermolecular interactions. However, this blend exhibits the slowest response at low-light intensities, which is correlated with biphasic photocurrent transients indicative of the presence of a low density of deep trap states. Optical, structural, and energetical analyses indicate that MPTA molecular packing is strongly disrupted by C60, resulting in a larger (370 meV) HOMO level shift. This results in greater energetic inhomogeneity including possible MPTA-C60 adduct formation, leading to deep trap states which limit the low-light photoresponse time. This work provides important insights into the small molecule design rules critical for low charge-trapping and high-speed OPD applications.

Suggested Citation

  • 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.
    • Handle: RePEc:nat:natcom:v:13:y:2022:i:1:d:10.1038_s41467-022-31367-4
    DOI: 10.1038/s41467-022-31367-4
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    References listed on IDEAS

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    1. Jiaying Wu & Joel Luke & Harrison Ka Hin Lee & Pabitra Shakya Tuladhar & Hyojung Cha & Soo-Young Jang & Wing Chung Tsoi & Martin Heeney & Hongkyu Kang & Kwanghee Lee & Thomas Kirchartz & Ji-Seon Kim &, 2019. "Tail state limited photocurrent collection of thick photoactive layers in organic solar cells," Nature Communications, Nature, vol. 10(1), pages 1-10, December.
    2. 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.
    3. Kamal Asadi & Auke J. Kronemeijer & Tobias Cramer & L. Jan Anton Koster & Paul W. M. Blom & Dago M. de Leeuw, 2013. "Polaron hopping mediated by nuclear tunnelling in semiconducting polymers at high carrier density," Nature Communications, Nature, vol. 4(1), pages 1-8, June.
    4. Armantas Melianas & Fabian Etzold & Tom J. Savenije & Frédéric Laquai & Olle Inganäs & Martijn Kemerink, 2015. "Photo-generated carriers lose energy during extraction from polymer-fullerene solar cells," Nature Communications, Nature, vol. 6(1), pages 1-8, December.
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    Cited by:

    1. Yuang Fu & Tack Ho Lee & Yi-Chun Chin & Richard A. Pacalaj & Chiara Labanti & Song Yi Park & Yifan Dong & Hye Won Cho & Jin Young Kim & Daiki Minami & James R. Durrant & Ji-Seon Kim, 2023. "Molecular orientation-dependent energetic shifts in solution-processed non-fullerene acceptors and their impact on organic photovoltaic performance," Nature Communications, Nature, vol. 14(1), pages 1-12, December.

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