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Ti1–graphene single-atom material for improved energy level alignment in perovskite solar cells

Author

Listed:
  • Chunyang Zhang

    (Dalian University of Technology
    École Polytechnique Fédérale de Lausanne)

  • Suxia Liang

    (Chinese Academy of Sciences)

  • Wei Liu

    (Dalian University of Technology)

  • Felix T. Eickemeyer

    (École Polytechnique Fédérale de Lausanne)

  • Xiangbin Cai

    (Hong Kong University of Science and Technology)

  • Ke Zhou

    (Xiamen University)

  • Jiming Bian

    (Dalian University of Technology)

  • Hongwei Zhu

    (École Polytechnique Fédérale de Lausanne)

  • Chao Zhu

    (Southeast University)

  • Ning Wang

    (Hong Kong University of Science and Technology)

  • Zaiwei Wang

    (École Polytechnique Fédérale de Lausanne)

  • Jiangwei Zhang

    (Chinese Academy of Sciences)

  • Yudi Wang

    (Dalian University of Technology)

  • Jinwen Hu

    (Dalian University of Technology)

  • Hongru Ma

    (Dalian University of Technology)

  • Cuncun Xin

    (Dalian University of Technology)

  • Shaik Mohammed Zakeeruddin

    (École Polytechnique Fédérale de Lausanne)

  • Michael Grätzel

    (École Polytechnique Fédérale de Lausanne)

  • Yantao Shi

    (Dalian University of Technology)

Abstract

Carbon-based perovskite solar cells (C-PSCs) are widely accepted as stable, cost-effective photovoltaics. However, C-PSCs have been suffering from relatively low power conversion efficiencies (PCEs) due to severe electrode-related energy loss. Herein, we report the application of a single-atom material (SAM) as the back electrode in C-PSCs. Our Ti1–rGO consists of single titanium (Ti) adatoms anchored on reduced graphene oxide (rGO) in a well-defined Ti1O4-OH configuration capable of tuning the electronic properties of rGO. The downshift of the Fermi level notably minimizes the series resistance of the carbon-based electrode. By combining with an advanced modular cell architecture, a steady-state PCE of up to 20.6% for C-PSCs is finally achieved. Furthermore, the devices without encapsulation retain 98% and 95% of their initial values for 1,300 h under 1 sun of illumination at 25°C and 60 °C, respectively.

Suggested Citation

  • Chunyang Zhang & Suxia Liang & Wei Liu & Felix T. Eickemeyer & Xiangbin Cai & Ke Zhou & Jiming Bian & Hongwei Zhu & Chao Zhu & Ning Wang & Zaiwei Wang & Jiangwei Zhang & Yudi Wang & Jinwen Hu & Hongru, 2021. "Ti1–graphene single-atom material for improved energy level alignment in perovskite solar cells," Nature Energy, Nature, vol. 6(12), pages 1154-1163, December.
    • Handle: RePEc:nat:natene:v:6:y:2021:i:12:d:10.1038_s41560-021-00944-0
    DOI: 10.1038/s41560-021-00944-0
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