The Band Structure and Contact Issues of Quasi One Dimensional TiS<sub>3</sub>

ORAL

Abstract

Titanium trisulfide (TiS3) is a transition metal trichalcogenide whose atoms form chains of trigonal prisms creating a quasi-one-dimensional structure. This 1D structure results in an anisotropic band structure and edge perfection that can reduce the edge scattering effects experienced in sub 10 nm field-effect transistors. Furthermore, a recent theoretical study indicates that monolayer TiS3 is a direct-gap semiconductor with a bandgap of ~1 eV and an electron mobility near 10,000 cm2V-1s-1 making TiS3 an ideal candidate for high mobility transistors. Our recent work directly measured the in-plane anisotropy of few layer TiS3 flakes using nanospot angle resolved photoemission spectroscopy. The effective hole mass at the top of the valence band was found to be -0.95 ± 0.09 me along the chain direction and -0.37 ± 0.1 me perpendicular to the chain direction. The measured mobility for TiS3 transistors has remained well below the predicted value, but it is common for contact issues to lower the measured mobility. The interactions between TiS3 and Au or Pt contacts have been investigated using x-ray photoemission spectroscopy which shows that strong bonding with sulfur is the key to prevent Schottky barrier formation.

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Presenters

  • Simeon Gilbert

    • Physics, University of Nebraska - Lincoln

Authors

  • Simeon Gilbert

    • Physics, University of Nebraska - Lincoln

  • Hemian Yi

    • Synchrotron-SOLEIL
    • Synchrotron SOLEIL
    • Antares beamline, Synchrotron Soleil, Paris, France

  • Takashi Komesu

    • Physics, University of Nebraska - Lincoln

  • Alexey Lipatov

    • Chemistry, University of Nebraska - Lincoln

  • Guanhua Hao

    • Department of Physics and Astronomy, University of Nebraska-Lincoln
    • Department of Physics and Astronomy, University of Nebraska-Lincoln, Lincoln, NE 68588- 0299
    • Physics, University of Nebraska - Lincoln
    • Physics and Astronomy, The University of Nebraska-Lincoln

  • Andrew J Yost

    • Department of Physics and Astronomy, University of Nebraska-Lincoln
    • Department of Physics and Astronomy, University of Nebraska-Lincoln, Lincoln, NE 68588- 0299
    • Physics, University of Nebraska - Lincoln
    • Physics and Astronomy, The University of Nebraska-Lincoln

  • Alexander Sinitskii

    • Department of Chemistry, University of Nebraska-Lincoln, Lincoln, NE 68588-0304
    • Chemistry, University of Nebraska-Lincoln
    • Chemistry, University of Nebraska - Lincoln

  • Jose Avila

    • Synchrotron SOLEIL
    • Antares beamline, Synchrotron Soleil, Paris, France

  • Chaoyu Chen

    • Synchrotron SOLEIL

  • Maria Asensio

    • Synchrotron SOLEIL

  • Peter A Dowben

    • Department of Physics and Astronomy, University of Nebraska-Lincoln
    • Department of Physics and Astronomy, University of Nebraska-Lincoln, Lincoln, NE 68588- 0299
    • Physics and Astronomy, University of Nebraska-Lincoln
    • Physics, University of Nebraska - Lincoln
    • Physics and Astronomy, The University of Nebraska-Lincoln