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Multiple exciton generation boosting over 100% quantum efficiency photoelectrochemical photodetection

Author

Listed:
  • Junjun Xue

    (Nanjing University of Posts and Telecommunications)

  • Xu Wang

    (Nanjing University of Posts and Telecommunications)

  • Guanyu Xu

    (Nanjing University of Posts and Telecommunications)

  • Xinya Tao

    (Nanjing University of Posts and Telecommunications)

  • Tongdao Pan

    (Nanjing University of Posts and Telecommunications)

  • Zhouyu Chen

    (Nanjing University of Posts and Telecommunications)

  • Qing Cai

    (Nanjing University)

  • Pengfei Shao

    (Nanjing University)

  • Guofeng Yang

    (Jiangnan University)

  • Zengli Huang

    (Suzhou Laboratory)

  • Ting Zhi

    (Nanjing University of Posts and Telecommunications)

  • Ke Wang

    (Nanjing University)

  • Bin Liu

    (Nanjing University)

  • Dunjun Chen

    (Nanjing University)

  • Rong Zhang

    (Nanjing University)

  • Jin Wang

    (Nanjing University of Posts and Telecommunications)

Abstract

The self-powered photoelectrochemical components themselves featured advancements in operating independently without external supply. Ultimately, due to lack of assistance from the external bias, the photoelectrochemical response is commonly restricted by the deficient photo-quantum efficiency for the absence of carrier multiplication. This work demonstrates a self-powered photoelectrochemical photodetector based on CuOx/AlGaN nanowires with staggered band structure and enhanced built-in potential for efficient exciton extraction. The generated multiple excitons within reach-through CuOx layer could be speedily separated before Auger recombination. This yields a 131.5% external quantum efficiency and 270.6 mA W−1 responsivity at 255 nm. The work confirms the role of multiple exciton generation in photoelectrochemical systems, offering a solution on paving path of advance for self-powered optoelectronics and weak-light UV imaging applications.

Suggested Citation

  • Junjun Xue & Xu Wang & Guanyu Xu & Xinya Tao & Tongdao Pan & Zhouyu Chen & Qing Cai & Pengfei Shao & Guofeng Yang & Zengli Huang & Ting Zhi & Ke Wang & Bin Liu & Dunjun Chen & Rong Zhang & Jin Wang, 2025. "Multiple exciton generation boosting over 100% quantum efficiency photoelectrochemical photodetection," Nature Communications, Nature, vol. 16(1), pages 1-12, December.
    • Handle: RePEc:nat:natcom:v:16:y:2025:i:1:d:10.1038_s41467-025-60420-1
    DOI: 10.1038/s41467-025-60420-1
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