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Ligand-assisted cation-exchange engineering for high-efficiency colloidal Cs1−xFAxPbI3 quantum dot solar cells with reduced phase segregation

Author

Listed:
  • Mengmeng Hao

    (The University of Queensland)

  • Yang Bai

    (The University of Queensland)

  • Stefan Zeiske

    (Swansea University)

  • Long Ren

    (University of Wollongong)

  • Junxian Liu

    (Griffith University)

  • Yongbo Yuan

    (Central South University)

  • Nasim Zarrabi

    (Swansea University)

  • Ningyan Cheng

    (University of Wollongong)

  • Mehri Ghasemi

    (The University of Queensland)

  • Peng Chen

    (The University of Queensland)

  • Miaoqiang Lyu

    (The University of Queensland)

  • Dongxu He

    (The University of Queensland)

  • Jung-Ho Yun

    (The University of Queensland)

  • Yi Du

    (University of Wollongong)

  • Yun Wang

    (Griffith University)

  • Shanshan Ding

    (The University of Queensland)

  • Ardalan Armin

    (Swansea University)

  • Paul Meredith

    (Swansea University)

  • Gang Liu

    (Chinese Academy of Sciences
    University of Science and Technology of China)

  • Hui-Ming Cheng

    (Chinese Academy of Sciences
    Tsinghua University
    University of Surrey)

  • Lianzhou Wang

    (The University of Queensland)

Abstract

The mixed caesium and formamidinium lead triiodide perovskite system (Cs1−xFAxPbI3) in the form of quantum dots (QDs) offers a pathway towards stable perovskite-based photovoltaics and optoelectronics. However, it remains challenging to synthesize such multinary QDs with desirable properties for high-performance QD solar cells (QDSCs). Here we report an effective oleic acid (OA) ligand-assisted cation-exchange strategy that allows controllable synthesis of Cs1−xFAxPbI3 QDs across the whole composition range (x = 0–1), which is inaccessible in large-grain polycrystalline thin films. In an OA-rich environment, the cross-exchange of cations is facilitated, enabling rapid formation of Cs1−xFAxPbI3 QDs with reduced defect density. The hero Cs0.5FA0.5PbI3 QDSC achieves a certified record power conversion efficiency (PCE) of 16.6% with negligible hysteresis. We further demonstrate that the QD devices exhibit substantially enhanced photostability compared with their thin-film counterparts because of suppressed phase segregation, and they retain 94% of the original PCE under continuous 1-sun illumination for 600 h.

Suggested Citation

  • Mengmeng Hao & Yang Bai & Stefan Zeiske & Long Ren & Junxian Liu & Yongbo Yuan & Nasim Zarrabi & Ningyan Cheng & Mehri Ghasemi & Peng Chen & Miaoqiang Lyu & Dongxu He & Jung-Ho Yun & Yi Du & Yun Wang , 2020. "Ligand-assisted cation-exchange engineering for high-efficiency colloidal Cs1−xFAxPbI3 quantum dot solar cells with reduced phase segregation," Nature Energy, Nature, vol. 5(1), pages 79-88, January.
    • Handle: RePEc:nat:natene:v:5:y:2020:i:1:d:10.1038_s41560-019-0535-7
    DOI: 10.1038/s41560-019-0535-7
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    Cited by:

    1. Lingju Meng & Xihua Wang, 2022. "Doping Colloidal Quantum Dot Materials and Devices for Photovoltaics," Energies, MDPI, vol. 15(7), pages 1-29, March.
    2. Weilun Li & Mengmeng Hao & Ardeshir Baktash & Lianzhou Wang & Joanne Etheridge, 2023. "The role of ion migration, octahedral tilt, and the A-site cation on the instability of Cs1-xFAxPbI3," Nature Communications, Nature, vol. 14(1), pages 1-11, December.

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