Temperature dependent electrical and photoconductive properties of few-layer Indium Selenide (InSe) FETs

ORAL

Abstract

Here we report on the temperature dependent electrical and photoconductive properties of n-type few-layer InSe Field Effect Transistors (FETs), micromechanically exfoliated from bulk crystal grown using chemical vapor transport method. The temperature dependent electrical conduction in these InSe FETs shows two distinct conduction mechanisms. At high temperatures electrical conduction is governed by thermally activated behavior, while at low temperatures electrical conduction follows Mott’s 2D variable range hopping mechanism. Further, photoconductivity measurements show that these InSe FETs display room temperature photo-responsivities of ~ 0.05 AW-1 when illuminated with a laser of wavelength λ = 658 nm and a power of ~23 nW. The photo-responsivities of these FETs showed several orders of magnitude improvement (up to ~ 15 AW-1) upon application of a gate voltage (VG = 60 V). These key findings and temperature dependent photoconductivity study will be presented and discussed.

*This work was supported by the U.S. Army Research Office MURI grant # W911NF-11-1-0362.

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Presenters

  • Milinda Wasala

    • Department of Physics, Southern Illinois University Carbondale, Carbondale, IL, USA
    • Department of Physics, Southern Illinois University Carbondale, IL-62901, USA.
    • Southern Illinois University Carbondale
    • Physics, Southern Illinois University Carbondale
    • Department of Physics, Southern Illinois University Carbondale

Authors

  • Milinda Wasala

    • Department of Physics, Southern Illinois University Carbondale, Carbondale, IL, USA
    • Department of Physics, Southern Illinois University Carbondale, IL-62901, USA.
    • Southern Illinois University Carbondale
    • Physics, Southern Illinois University Carbondale
    • Department of Physics, Southern Illinois University Carbondale

  • Prasanna Dnyaneshwar Patil

    • Department of Physics, Southern Illinois University Carbondale, Carbondale, IL, USA
    • Department of Physics, Southern Illinois University Carbondale, IL-62901, USA.
    • Physics, Southern Illinois University Carbondale
    • Department of Physics, Southern Illinois University Carbondale

  • Sujoy Ghosh

    • Department of Physics, Southern Illinois University Carbondale, Carbondale, IL, USA
    • Department of Physics, Southern Illinois University Carbondale, IL-62901, USA.

  • Rana Alkhaldi

    • Department of Physics, Southern Illinois University Carbondale, Carbondale, IL, USA
    • Department of Physics, Southern Illinois University Carbondale, IL-62901, USA.
    • Physics, Southern Illinois University Carbondale

  • Lincoln Weber

    • Department of Physics, Southern Illinois University Carbondale, Carbondale, IL, USA
    • Department of Physics, Southern Illinois University Carbondale, IL-62901, USA.

  • Sidong Lei

    • Department of Materials Science and Nano Engineering, Rice University, Houston, TX, USA
    • Department of Materials Science and Nano Engineering, Rice University, Houston, TX-77005, USA.
    • Department of Materials Science and Nano Engineering, Rice University

  • Hansika Sirikumara

    • Department of Physics, Southern Illinois University Carbondale, Carbondale, IL, USA
    • Department of Physics, Southern Illinois University Carbondale

  • Thushari Jayasekera

    • Department of Physics, Southern Illinois University Carbondale, Carbondale, IL, USA

  • Robert Vajtai

    • Department of Materials Science and Nano Engineering, Rice University, Houston, TX, USA
    • Department of Materials Science and Nano Engineering, Rice University, Houston, TX-77005, USA.
    • Rice University
    • Department of Materials Science and Nano Engineering, Rice University

  • Pulickel M Ajayan

    • Department of Materials Science and Nano Engineering, Rice University, Houston, TX, USA
    • Department of Materials Science and Nano Engineering, Rice University, Houston, TX-77005, USA.
    • Rice University
    • Materials Science & NanoEngineering, Rice University
    • Department of Materials Science and Nano Engineering, Rice University

  • Saikat Talapatra

    • Department of Physics, Southern Illinois University Carbondale, Carbondale, IL, USA
    • Department of Physics, Southern Illinois University Carbondale, IL-62901, USA.
    • Southern Illinois University Carbondale
    • Physics, Southern Illinois University Carbondale
    • Department of Physics, Southern Illinois University Carbondale