Charge transport in ion-gated mono-, bi-, and trilayer MoS2 field effect transistors

Leiqiang Chu, Hennrik Schmidt, Jiang Pu, Shunfeng Wang, Barbaros Özyilmaz, Taishi Takenobu, Goki Eda

    Research output: Contribution to journalArticle

    43 Citations (Scopus)

    Abstract

    Charge transport in MoS2 in the low carrier density regime is dominated by trap states and band edge disorder. The intrinsic transport properties of MoS2 emerge in the high density regime where conduction occurs via extended states. Here, we investigate the transport properties of mechanically exfoliated mono-, bi-, and trilayer MoS2 sheets over a wide range of carrier densities realized by a combination of ion gel top gate and SiO2 back gate, which allows us to achieve high charge carrier (>1013 cm22) densities. We discuss the gating properties of the devices as a function of layer thickness and demonstrate resistivities as low as 1 kω for monolayer and 420 ω for bilayer devices at 10 K. We show that from the capacitive coupling of the two gates, quantum capacitance can be roughly estimated to be on the order of 1 mu;F/cm2 for all devices studied. The temperature dependence of the carrier mobility in the high density regime indicates that short-range scatterers limit charge transport at low temperatures.

    Original languageEnglish
    Article number7293
    JournalScientific Reports
    Volume4
    DOIs
    Publication statusPublished - 2014 Dec 3

    Fingerprint

    field effect transistors
    transport properties
    ions
    carrier mobility
    charge carriers
    capacitance
    traps
    gels
    disorders
    conduction
    temperature dependence
    electrical resistivity
    scattering

    ASJC Scopus subject areas

    • General

    Cite this

    Chu, L., Schmidt, H., Pu, J., Wang, S., Özyilmaz, B., Takenobu, T., & Eda, G. (2014). Charge transport in ion-gated mono-, bi-, and trilayer MoS2 field effect transistors. Scientific Reports, 4, [7293]. https://doi.org/10.1038/srep07293

    Charge transport in ion-gated mono-, bi-, and trilayer MoS2 field effect transistors. / Chu, Leiqiang; Schmidt, Hennrik; Pu, Jiang; Wang, Shunfeng; Özyilmaz, Barbaros; Takenobu, Taishi; Eda, Goki.

    In: Scientific Reports, Vol. 4, 7293, 03.12.2014.

    Research output: Contribution to journalArticle

    Chu, L, Schmidt, H, Pu, J, Wang, S, Özyilmaz, B, Takenobu, T & Eda, G 2014, 'Charge transport in ion-gated mono-, bi-, and trilayer MoS2 field effect transistors', Scientific Reports, vol. 4, 7293. https://doi.org/10.1038/srep07293
    Chu, Leiqiang ; Schmidt, Hennrik ; Pu, Jiang ; Wang, Shunfeng ; Özyilmaz, Barbaros ; Takenobu, Taishi ; Eda, Goki. / Charge transport in ion-gated mono-, bi-, and trilayer MoS2 field effect transistors. In: Scientific Reports. 2014 ; Vol. 4.
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    AU - Takenobu, Taishi

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