Large Area Synthesis of WS$_2$ Crystalline Sheets Directly on SiO$_2$ and Their Transfer to Other Substrates

POSTER

Abstract

Metal dichalcogenides (e.g. MoS$_2$, WS$_2$, NbS$_2)$ have attracted attention because they are layered materials that could exhibit either semiconducting or metallic properties. These properties could be significantly modified when these materials become monolayers. Here we report for the first time the synthesis of large area few-layer WS$_2$ by a two step method. WO$_{\mathrm{x}}$ thin films were first grown on a Si/SiO$_2$ substrate and these films were sulfurized in a second step. Furthermore, we have developed an efficient route to transfer these WS$_2$ films onto different substrates. WS$_2$ films of different thicknesses have been analyzed by Raman spectroscopy, HRTEM and AFM. Characterization techniques demonstrate the presence of mono-, bi- and few-layered WS$_2$ in the as-grown samples. The novel photoluminescence properties of the films will also be discussed.

Authors

  • Ana L. El\'Ias

    Department of Physics, The Pennsylvania State University, University Park, PA 16802, USA, The Pennsylvania State University, Penn State University, University Park, PA, Penn State University, Department of Physics, The Pennsylvania State University

  • Nestor Perea-Lopez

    Department of Physics, The Pennsylvania State University, University Park, PA 16802, USA, The Pennsylvania State University, Pennsylvania State University, Department of Physics, The Pennsylvania State University

  • Andres Castro-Beltran

    Universidad Autonoma de Nuevo Leon, The Pennsylvania State University

  • Ayse Berkdemir

    Department of Physics, The Pennsylvania State University, University Park, PA 16802, USA, The Pennsylvania State University, Department of Physics, The Pennsylvania State University

  • Simin Feng

    The Pennsylvania State University, The Pennsylvania State University, USA

  • Ruitao Lv

    Department of Physics, The Pennsylvania State University, University Park, PA 16802, USA, The Pennsylvania State University

  • Aaron Long

    The Pennsylvania State University

  • Takuya Hayashi

    Shinshu University

  • Yoong Ahm Kim

    Shinshu University

  • Morinobu Endo

    Shinshu University

  • Humberto R. Gutierrez

    Department of Physics and Astronomy, University of Louisville, Louisville, KY 40292 USA., University of Louisville, Department of Physics and Astronomy, University of Louisville, KY

  • Sujoy Ghosh

    Southern Illinois University, Carbondale, IL, Southern Illinois University Carbondale

  • Saikat Talapatra

    Southern Illinois University, Carbondale, IL, Southern Illinois University Carbondale, Southern Illinois University at Carbondale

  • Nihar R. Pradhan

    Florida State University

  • L. Balicas

    National High Magnetic Field Laboratory, Florida State University, Tallahassee, FL, USA, National High Magnetic Field Lab, Tallahassee, FL, Florida State University, National High Magneti Field Lab, National High Magnetic Field Lab, NHMFL

  • Florentino Lopez-Urias

    The Pennsylvania State University, The Pennsylvania State University, IPICYT

  • Humberto Terrones

    The Pennsylvania State University, Center for Nanophase Materials Sciences, Oak Ridge National Laboratory

  • Mauricio Terrones

    The Pennsylvania State University, Pennsylvania State University, Department of Physics, The Pennsylvania State University