Multiple exciton generation boosting over 100% quantum efficiency photoelectrochemical photodetection
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 CuO<sub>x</sub>/AlGaN nanowires with staggered band structure and enhanced built-in potential for efficient exciton extraction. The generated multiple excitons within reach-through CuO<sub>x</sub> layer could be speedily separated before Auger recombination. This yields a 131.5% external quantum efficiency and 270.6 mA W<sup>-1</sup> 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.
Authors
- Dunjun Chen (ORCID: https://orcid.org/0000-0002-1363-1413)
- Guofeng Yang (ORCID: https://orcid.org/0000-0002-4409-9685)
- Ting Zhi (ORCID: https://orcid.org/0009-0005-6393-3259)
- Junjun Xue (ORCID: https://orcid.org/0000-0003-1546-7271)
- Pengfei Shao (ORCID: https://orcid.org/0000-0002-7474-4307)
- Guanyu Xu (ORCID: https://orcid.org/0000-0002-2771-9272)
- Taisong Pan (ORCID: https://orcid.org/0000-0003-1576-3409)
- Xian Tao (ORCID: https://orcid.org/0000-0001-5834-5181)
- Zhouyu Chen
- Rong Zhang (ORCID: https://orcid.org/0000-0003-0015-6331)
- Ke Wang (ORCID: https://orcid.org/0000-0002-1174-0907)
- Jin Wang (ORCID: https://orcid.org/0000-0002-9881-7208)
- Zengli Huang (ORCID: https://orcid.org/0000-0002-1201-3509)
- Bin Liu (ORCID: https://orcid.org/0000-0002-9495-6809)
- Qing Cai (ORCID: https://orcid.org/0000-0001-8963-2677)
- Xu Wang (ORCID: https://orcid.org/0000-0002-7871-5749)
Institutions
- Jiangnan University (CN)
- Nanjing University of Posts and Telecommunications (CN)
- Nanjing University (CN)
Publication Details
- Journal
- Nature Communications
- Published
- 2025-06-06
- DOI
- https://doi.org/10.1038/s41467-025-60420-1
- Citations
- 34
- Primary Topic
- ZnO doping and properties
- Type
- article
- Field-Weighted Citation Impact
- 17.61
Funders
- National Natural Science Foundation of China
- China Postdoctoral Science Foundation
- Nanjing University of Posts and Telecommunications
- Nanjing University
- National Key Research and Development Program of China