{
  "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.",
  "abstract_shown": true,
  "affiliations": [
    "Institute of Physics and Electronic Information Yunnan Normal University Kunming China.",
    "Yunnan Key Laboratory of Opto-electronic Information Technology Yunnan Normal University Kunming China.",
    "Southwest United Graduate School Kunming China.",
    "College of Physics Nankai University Tianjin China."
  ],
  "article_type": "research article",
  "arxiv": null,
  "author_total": 8,
  "authors": [
    {
      "affs": [
        0,
        1,
        2
      ],
      "name": "Lei Liu",
      "orcid": "0000-0002-9869-4826"
    },
    {
      "affs": [
        0,
        1
      ],
      "name": "Haoyun Dou",
      "orcid": "0009-0003-5359-4316"
    },
    {
      "affs": [
        0,
        1,
        2
      ],
      "name": "Haiqiang Huang"
    },
    {
      "affs": [
        0,
        1
      ],
      "name": "Fan Mu"
    },
    {
      "affs": [
        0,
        1,
        2
      ],
      "name": "Yan Yang"
    },
    {
      "affs": [
        0,
        1
      ],
      "name": "Hui Zhang",
      "orcid": "0000-0002-3116-5217"
    },
    {
      "affs": [
        2,
        3
      ],
      "name": "Feng Song",
      "orcid": "0000-0002-5577-6370"
    },
    {
      "affs": [
        0,
        1,
        2
      ],
      "name": "Yingkai Liu",
      "orcid": "0000-0001-6691-8605"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/0c7s0t749fr97.bib",
  "cited_by": 0,
  "doi": "10.1002/nap2.70362",
  "fulltext_url": "https://europepmc.org/articles/PMC13743990",
  "id": "0c7s0t749fr97",
  "issns": [
    "2192-8606",
    "2192-8614"
  ],
  "landing_url": "https://europepmc.org/article/MED/42999569",
  "language": "eng",
  "licence": "CC-BY",
  "licence_label": "CC BY",
  "licence_source": "article",
  "licence_url": "https://creativecommons.org/licenses/by/4.0/",
  "metadata_licence": null,
  "native_subjects": [
    [
      "openalex",
      "2505|2D Materials and Applications"
    ]
  ],
  "openalex": "W7225461377",
  "pdf_url": "https://europepmc.org/articles/PMC13743990?pdf=render",
  "pmcid": "PMC13743990",
  "pmid": "42999569",
  "published": "2026-11-07",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/0c7s0t749fr97.ris",
  "sources": [
    {
      "first_seen": "2026-11-09T15:20:34Z",
      "native_id": "MED:42999569",
      "source": "europepmc",
      "url": "https://europepmc.org/article/MED/42999569"
    }
  ],
  "subjects": [
    {
      "field": "chemistry",
      "origin": "openalex:2505|2D Materials and Applications",
      "subfield": "materials-polymers"
    }
  ],
  "title": "Self-Powered Photodetection and Optical Information Recognition in a Mixed-Dimensional WSe₂/CdSe Heterojunction.",
  "title_text": "Self-Powered Photodetection and Optical Information Recognition in a Mixed-Dimensional WSe₂/CdSe Heterojunction.",
  "type": "peer-reviewed",
  "updated_at": "2026-11-09T15:20:34Z",
  "url": "https://research.draconitic.com/paper/0c7s0t749fr97",
  "venue": "Nanophotonics (Berlin, Germany)",
  "versions": []
}