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Enhanced optoelectronic quality of perovskite thin films with hypophosphorous acid for planar heterojunction solar cells

Author

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  • Wei Zhang

    (Clarendon Laboratory, University of Oxford)

  • Sandeep Pathak

    (Clarendon Laboratory, University of Oxford)

  • Nobuya Sakai

    (Clarendon Laboratory, University of Oxford)

  • Thomas Stergiopoulos

    (Clarendon Laboratory, University of Oxford)

  • Pabitra K. Nayak

    (Clarendon Laboratory, University of Oxford)

  • Nakita K. Noel

    (Clarendon Laboratory, University of Oxford)

  • Amir A. Haghighirad

    (Clarendon Laboratory, University of Oxford)

  • Victor M. Burlakov

    (Clarendon Laboratory, University of Oxford
    Mathematical Institute, University of Oxford)

  • Dane W. deQuilettes

    (University of Washington)

  • Aditya Sadhanala

    (Cavendish Laboratory, University of Cambridge)

  • Wenzhe Li

    (Tsinghua University)

  • Liduo Wang

    (Tsinghua University)

  • David S. Ginger

    (University of Washington)

  • Richard H. Friend

    (Cavendish Laboratory, University of Cambridge)

  • Henry J. Snaith

    (Clarendon Laboratory, University of Oxford)

Abstract

Solution-processed metal halide perovskite semiconductors, such as CH3NH3PbI3, have exhibited remarkable performance in solar cells, despite having non-negligible density of defect states. A likely candidate is halide vacancies within the perovskite crystals, or the presence of metallic lead, both generated due to the imbalanced I/Pb stoichiometry which could evolve during crystallization. Herein, we show that the addition of hypophosphorous acid (HPA) in the precursor solution can significantly improve the film quality, both electronically and topologically, and enhance the photoluminescence intensity, which leads to more efficient and reproducible photovoltaic devices. We demonstrate that the HPA can reduce the oxidized I2 back into I−, and our results indicate that this facilitates an improved stoichiometry in the perovskite crystal and a reduced density of metallic lead.

Suggested Citation

  • Wei Zhang & Sandeep Pathak & Nobuya Sakai & Thomas Stergiopoulos & Pabitra K. Nayak & Nakita K. Noel & Amir A. Haghighirad & Victor M. Burlakov & Dane W. deQuilettes & Aditya Sadhanala & Wenzhe Li & L, 2015. "Enhanced optoelectronic quality of perovskite thin films with hypophosphorous acid for planar heterojunction solar cells," Nature Communications, Nature, vol. 6(1), pages 1-9, December.
    • Handle: RePEc:nat:natcom:v:6:y:2015:i:1:d:10.1038_ncomms10030
    DOI: 10.1038/ncomms10030
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    Cited by:

    1. Dhruba B. Khadka & Yasuhiro Shirai & Masatoshi Yanagida & Hitoshi Ota & Andrey Lyalin & Tetsuya Taketsugu & Kenjiro Miyano, 2024. "Defect passivation in methylammonium/bromine free inverted perovskite solar cells using charge-modulated molecular bonding," Nature Communications, Nature, vol. 15(1), pages 1-16, December.

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