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Strong absorption and ultrafast localisation in NaBiS2 nanocrystals with slow charge-carrier recombination

Author

Listed:
  • Yi-Teng Huang

    (University of Cambridge)

  • Seán R. Kavanagh

    (University College London
    Imperial College London
    University College London)

  • Marcello Righetto

    (University of Oxford, Clarendon Laboratory)

  • Marin Rusu

    (Helmholtz-Zentrum Berlin für Materialien und Energie)

  • Igal Levine

    (Helmholtz-Zentrum Berlin für Materialien und Energie GmbH)

  • Thomas Unold

    (Helmholtz-Zentrum Berlin für Materialien und Energie)

  • Szymon J. Zelewski

    (University of Cambridge
    Wrocław University of Science and Technology)

  • Alexander J. Sneyd

    (University of Cambridge)

  • Kaiwen Zhang

    (University of Cambridge)

  • Linjie Dai

    (University of Cambridge)

  • Andrew J. Britton

    (University of Leeds)

  • Junzhi Ye

    (University of Cambridge)

  • Jaakko Julin

    (University of Jyväskylä)

  • Mari Napari

    (University of Southampton)

  • Zhilong Zhang

    (University of Cambridge)

  • James Xiao

    (University of Cambridge)

  • Mikko Laitinen

    (Technical University of Munich)

  • Laura Torrente-Murciano

    (University of Cambridge)

  • Samuel D. Stranks

    (University of Cambridge
    University of Cambridge)

  • Akshay Rao

    (University of Cambridge)

  • Laura M. Herz

    (University of Oxford, Clarendon Laboratory
    Technical University of Munich)

  • David O. Scanlon

    (University College London
    University College London)

  • Aron Walsh

    (Imperial College London
    University College London)

  • Robert L. Z. Hoye

    (Imperial College London)

Abstract

I-V-VI2 ternary chalcogenides are gaining attention as earth-abundant, nontoxic, and air-stable absorbers for photovoltaic applications. However, the semiconductors explored thus far have slowly-rising absorption onsets, and their charge-carrier transport is not well understood yet. Herein, we investigate cation-disordered NaBiS2 nanocrystals, which have a steep absorption onset, with absorption coefficients reaching >105 cm−1 just above its pseudo-direct bandgap of 1.4 eV. Surprisingly, we also observe an ultrafast (picosecond-time scale) photoconductivity decay and long-lived charge-carrier population persisting for over one microsecond in NaBiS2 nanocrystals. These unusual features arise because of the localised, non-bonding S p character of the upper valence band, which leads to a high density of electronic states at the band edges, ultrafast localisation of spatially-separated electrons and holes, as well as the slow decay of trapped holes. This work reveals the critical role of cation disorder in these systems on both absorption characteristics and charge-carrier kinetics.

Suggested Citation

  • Yi-Teng Huang & Seán R. Kavanagh & Marcello Righetto & Marin Rusu & Igal Levine & Thomas Unold & Szymon J. Zelewski & Alexander J. Sneyd & Kaiwen Zhang & Linjie Dai & Andrew J. Britton & Junzhi Ye & J, 2022. "Strong absorption and ultrafast localisation in NaBiS2 nanocrystals with slow charge-carrier recombination," Nature Communications, Nature, vol. 13(1), pages 1-13, December.
    • Handle: RePEc:nat:natcom:v:13:y:2022:i:1:d:10.1038_s41467-022-32669-3
    DOI: 10.1038/s41467-022-32669-3
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    References listed on IDEAS

    as
    1. Inès Massiot & Andrea Cattoni & Stéphane Collin, 2020. "Progress and prospects for ultrathin solar cells," Nature Energy, Nature, vol. 5(12), pages 959-972, December.
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    Cited by:

    1. Yueshuang Mao & Bingnan Yu & Pengfei Wang & Shuai Yue & Sihui Zhan, 2024. "Efficient reduction-oxidation coupling degradation of nitroaromatic compounds in continuous flow processes," Nature Communications, Nature, vol. 15(1), pages 1-11, December.
    2. Artem Musiienko & Fengjiu Yang & Thomas William Gries & Chiara Frasca & Dennis Friedrich & Amran Al-Ashouri & Elifnaz Sağlamkaya & Felix Lang & Danny Kojda & Yi-Teng Huang & Valerio Stacchini & Robert, 2024. "Resolving electron and hole transport properties in semiconductor materials by constant light-induced magneto transport," Nature Communications, Nature, vol. 15(1), pages 1-11, December.

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