Quaternery two dimensional transiton metal dichalcogenide alloys

ORAL

Abstract

Monolayers of 2D TMDs, due to their unique band gap are useful in various optoelectronic devices. Alloying in 2D TMDs has gained importance due to its band gap tunability. However this tunability could futher be improved by increasing number of components, which provides more flexibility and degress of freedom. In the present work, quaternary alloys (MoxW1-xS2ySe2(1-y)) (0< x,y <1) have been synthesised using CVD. The composition of the alloy has been tuned by changing the growth temperature, resulting in wide band gap tunability from 1.6 to 1.85 eV. Detailed DFT calcaulations support the experimental data. This wide range of band gap tunability would open the doors for 2D TMDs to be used in applications like laser diodes and LEDs.

*This work was supported by the MURI ARO program, grant number W911NF-11-1-0362, by FAME, one of six centers of STARnet, a Semiconductor Research Corporation program sponsored by MARCO and DARPA, Air Force Office of Scientific Research, (AFOSR) Grant No. FA9550-14-1-0268. The theory part of this work was

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Presenters

  • Sandhya Susarla

    • Materials Science & NanoEngineering, Rice University
    • MSNE, Rice Univ

Authors

  • Sandhya Susarla

    • Materials Science & NanoEngineering, Rice University
    • MSNE, Rice Univ

  • Alex Kutana

    • MSNE, Rice Univ

  • Jordan Hachtel

    • Center for Nanophase Materials Sciences, Oak Ridge National Laboratory
    • Oak Ridge National Laboratory, Center for Nanophase Materials

  • Vidya Kochat

    • Materials Science & NanoEngineering, Rice University
    • MSNE, Rice Univ

  • Amey Apte

    • MSNE, Rice Univ
    • Rice University

  • Robert Vajtai

    • MSNE, Rice Univ
    • Department of Materials Science and Nano Engineering, Rice University

  • Juan Carlos Idrobo

    • Center for Nanophase Materials Sciences, Oak Ridge National Laboratory
    • Oak Ridge National Laboratory, Center for Nanophase Materials

  • Boris Yakobson

    • MSNE, Rice Univ

  • Chandra Sekhar Tiwary

    • Materials Science & NanoEngineering, Rice University
    • MSNE, Rice Univ

  • Pulickel Ajayan

    • Materials Science & NanoEngineering, Rice University
    • MSNE, Rice Univ
    • Department of Materials Science and Nano Engineering, Rice University
    • Department of Materials Science and Nanoengineering, Rice university
    • Rice University