Synthesis and Photoresponse of Few Layer Liquid Phase Exfoliated Molybdenum Disulphide (MoS$_2$) Flakes

ORAL

Abstract

We report on the temperature dependent photo response of~thin films of MoS$_{2}$ consisting of few layered flakes obtained by liquid phase exfoliation of bulk MoS$_{2}$ powder. We found that under a constant laser power (wavelength $=$ 658 nm) the photocurrent (I$_{\mathrm{ph}}$) increases with increasing temperature and reaches a maximum value of I$_{\mathrm{ph(max)}}$ at T$=$T$_{\mathrm{m}}$ within the studied temperature range (330K \textless T \textless 25). Thereafter, I$_{\mathrm{ph}}$, decreases with further increase in temperature and also becomes temperature independent at low temperatures. Further, it was found that in such films I$_{\mathrm{ph}}$ $\sim$ (laser intensity)$^{\gamma}$ with 0.5 \textless $\gamma $ \textless 1.0. These findings will be presented and discussed under various available models related to photoconductivity in semiconductors.

*This work is supported by the U.S. Army Research Office MURI Award \# W911NF-11-1-0362.

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Authors

  • Sujoy Ghosh

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

  • Baleeswaraiah Muchharla

    • Southern Illinois University, Carbondale, IL-62901

  • Andrew Winchester

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

  • Simin Feng

    • Pennsylvania State University, University Park, PA-16802

  • Ana Laura Elias

    • Pennsylvania State University, University Park, PA-16802

  • Nestor Perea Lopez

    • Pennsylvania State University, University Park, PA-16802

  • Swastik Kar

    • Northeastern University, Boston, MA 02115

  • Mauricio Terrones

    • Pennsylvania State University, University Park, PA-16802, Research Center for Exotic Nanocarbons, Shinshu University, Nagano-city, Nagano, Japan
    • Department of Physics and Center for 2-Dimensional and Layered Materials, The Pennsylvania State University

  • Saikat Talapatra

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