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Peer-reviewedCC BYNanophotonics (Berlin, Germany)

Self-Powered Photodetection and Optical Information Recognition in a Mixed-Dimensional WSe₂/CdSe Heterojunction.

  • Lei Liu1,2,3
  • Haoyun Dou1,2
  • Haiqiang Huang1,2,3
  • Fan Mu1,2
  • Yan Yang1,2,3
  • Hui Zhang1,2
  • Feng Song3,4
  • Yingkai Liu1,2,3
4 affiliations
  1. 1Institute of Physics and Electronic Information Yunnan Normal University Kunming China.
  2. 2Yunnan Key Laboratory of Opto-electronic Information Technology Yunnan Normal University Kunming China.
  3. 3Southwest United Graduate School Kunming China.
  4. 4College of Physics Nankai University Tianjin China.
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Abstract

Mixed-dimensional van der Waals heterojunctions offer opportunities for self-powered optical sensing and information processing, yet identifying the spatial origin of zero-bias photoresponse remains important for understanding device operation. Here, a vertical WSe2/CdSe heterojunction composed of a WSe2 nanosheet and a CdSe nanobelt is investigated for visible photodetection. Under 610 nm illumination, the device exhibits a photovoltaic response with an open-circuit voltage of 0.403 V and a short-circuit current of 4.77 × 10-10 A. Quantitative photocurrent mapping reveals a mean response of 5.94 nA in the heterojunction overlap region, approximately 50 times that near the metal contacts. Scanning Kelvin probe microscopy yields a reproducible contact-potential-difference contrast of 293 ± 15 mV, whereas electronic-structure calculations support a type-II band-edge configuration and interfacial charge redistribution. At 100 Hz, the measured rise/fall times are 1.09/0.99 ms at 0 V and 165/191 μs at +3 V. Under +3 V bias, approximately 97% of the reference modulation amplitude is retained at 1 kHz. Self-powered optical imaging and wavelength- and time-window-dependent 8-bit information recognition are further demonstrated, with all 96 tested bits correctly decoded. These results highlight the potential of mixed-dimensional WSe2/CdSe heterojunctions for self-powered visible-light sensing and optical information recognition.

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Cite

BibTeXRIS
BibTeX
@article{liu2026selfpowered,
  title = {{Self-Powered Photodetection and Optical Information Recognition in a Mixed-Dimensional WSe₂/CdSe Heterojunction.}},
  author = {Lei Liu and Haoyun Dou and Haiqiang Huang and Fan Mu and Yan Yang and Hui Zhang and Feng Song and Yingkai Liu},
  journal = {Nanophotonics (Berlin, Germany)},
  year = {2026},
  month = nov,
  doi = {10.1002/nap2.70362},
  url = {https://europepmc.org/article/MED/42999569},
  note = {CC BY},
}
RIS
TY  - JOUR
TI  - Self-Powered Photodetection and Optical Information Recognition in a Mixed-Dimensional WSe₂/CdSe Heterojunction.
AU  - Lei Liu
AU  - Haoyun Dou
AU  - Haiqiang Huang
AU  - Fan Mu
AU  - Yan Yang
AU  - Hui Zhang
AU  - Feng Song
AU  - Yingkai Liu
PY  - 2026
DA  - 2026/11/07
JO  - Nanophotonics (Berlin, Germany)
DO  - 10.1002/nap2.70362
UR  - https://europepmc.org/article/MED/42999569
AB  - Mixed-dimensional van der Waals heterojunctions offer opportunities for self-powered optical sensing and information processing, yet identifying the spatial origin of zero-bias photoresponse remains important for understanding device operation. Here, a vertical WSe2/CdSe heterojunction composed of a WSe2 nanosheet and a CdSe nanobelt is investigated for visible photodetection. Under 610 nm illumination, the device exhibits a photovoltaic response with an open-circuit voltage of 0.403 V and a short-circuit current of 4.77 × 10-10 A. Quantitative photocurrent mapping reveals a mean response of 5.94 nA in the heterojunction overlap region, approximately 50 times that near the metal contacts. Scanning Kelvin probe microscopy yields a reproducible contact-potential-difference contrast of 293 ± 15 mV, whereas electronic-structure calculations support a type-II band-edge configuration and interfacial charge redistribution. At 100 Hz, the measured rise/fall times are 1.09/0.99 ms at 0 V and 165/191 μs at +3 V. Under +3 V bias, approximately 97% of the reference modulation amplitude is retained at 1 kHz. Self-powered optical imaging and wavelength- and time-window-dependent 8-bit information recognition are further demonstrated, with all 96 tested bits correctly decoded. These results highlight the potential of mixed-dimensional WSe2/CdSe heterojunctions for self-powered visible-light sensing and optical information recognition.
SN  - 2192-8606
SN  - 2192-8614
ER  -