Photoresponse of Graphene-Gated Graphene-GaSe Heterojunction Devices

Wonjae Kim, Sanna Arpiainen, Hui Xue, Miika Soikkeli, Mei Qi, Zhipei Sun, Harri Lipsanen, Ferney A. Chaves, David Jiménez, Mika Prunnila

    Research output: Contribution to journalArticleScientificpeer-review

    24 Citations (Scopus)


    Because of their extraordinary physical properties, low-dimensional materials including graphene and gallium selenide (GaSe) are promising for future electronic and optoelectronic applications, particularly in transparent-flexible photodetectors. Currently, the photodetectors working at the near-infrared spectral range are highly indispensable in optical communications. However, the current photodetector architectures are typically complex, and it is normally difficult to control the architecture parameters. Here, we report graphene–GaSe heterojunction-based field-effect transistors with broadband photodetection from 730–1550 nm. Chemical-vapor-deposited graphene was employed as transparent gate and contact electrodes with tunable resistance, which enables effective photocurrent generation in the heterojunctions. The photoresponsivity was shown from 10 to 0.05 mA/W in the near-infrared region under the gate control. To understand behavior of the transistor, we analyzed the results via simulation performed using a model for the gate-tunable graphene–semiconductor heterojunction where possible Fermi level pinning effect is considered.
    Original languageEnglish
    Pages (from-to)3895–3902
    JournalACS Applied Nano Materials
    Issue number8
    Publication statusPublished - 24 Aug 2018
    MoE publication typeA1 Journal article-refereed


    This project has received funding from the European Union's Horizon 2020 research and innovation programme under grant agreement No 785219. This work was also partially funded by the Ministerio de Economía y Competitividad under the project TEC2015-67462-C2-1-R. The authors also acknowledge the funding from the Academy of Finland (Grants 276376, 284548, 295777, 304666, 312294, 312297, 312551, and 314810), TEKES-the Finnish Funding Agency for Technology and Innovation.


    • GaSe
    • graphene
    • heterojunction
    • photodetector
    • Schottky


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