Hole mobility enhancement and p-doping in monolayer WSe<inf>2</inf> by gold decoration

Chang Hsiao Chen, Chun Lan Wu, Jiang Pu, Ming Hui Chiu, Pushpendra Kumar, Taishi Takenobu, Lain Jong Li

    Research output: Contribution to journalArticle

    84 Citations (Scopus)

    Abstract

    Tungsten diselenide (WSe<inf>2</inf>) is an attractive transition metal dichalcogenide material, since its Fermi energy close to the mid gap makes it an excellent candidate for realizing p-n junction devices and complementary digital logic applications. Doping is one of the most important technologies for controlling the Fermi energy in semiconductors, including 2D materials. Here we present a simple, stable and controllable p-doping technique on a WSe<inf>2</inf> monolayer, where a more p-typed WSe<inf>2</inf> field effect transistor is realized by electron transfer from the WSe<inf>2</inf> to the gold (Au) decorated on the WSe<inf>2</inf> surfaces. Related changes in Raman spectroscopy are also reported. The p-doping caused by Au on WSe<inf>2</inf> monolayers lowers the channel resistance by orders of magnitude. The effective hole mobility is ∼100 (cm<sup>2</sup>/Vs) and the near ideal subthreshold swing of ∼60mV/decade and high on/off current ratio of >106 are observed. The Au deposited on the WSe<inf>2</inf> also serves as a protection layer to prevent a reaction between the WSe<inf>2</inf> and the environment, making the doping stable and promising for future scalable fabrication.

    Original languageEnglish
    Article number034001
    Journal2D Materials
    Volume1
    Issue number3
    DOIs
    Publication statusPublished - 2014 Dec 1

    Keywords

    • doping
    • transition metal dichalcogenide
    • WSe<inf>2</inf>

    ASJC Scopus subject areas

    • Mechanics of Materials
    • Mechanical Engineering
    • Materials Science(all)
    • Chemistry(all)
    • Condensed Matter Physics

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  • Cite this

    Chen, C. H., Wu, C. L., Pu, J., Chiu, M. H., Kumar, P., Takenobu, T., & Li, L. J. (2014). Hole mobility enhancement and p-doping in monolayer WSe<inf>2</inf> by gold decoration. 2D Materials, 1(3), [034001]. https://doi.org/10.1088/2053-1583/1/3/034001