Multi-junction lateral 2D heterostructures of transition metal dichalcogenides via sequential edge epitaxy

ORAL

Abstract

Here we demonstrate the successful synthesis of lateral in-plane multi-junction heterostructures based on transition metal dichalcogenides (TMD) 2D monolayers, using a modified chemical vapor deposition process where water vapor was use as a mediator for selective evaporation-deposition of the precursors. By only controlling the carrier gas composition, it is possible to selectively growth one TMD at the time. This introduces an unprecedented flexibility that allows a good in situ control of the lateral size of each TMD segment. The fabricated heterostructures include MoS2-WS2, MoSe2-WSe2 and MoSxSey-WSxSey, with multiple hetero-junctions. The band gap modulation across the junctions as well as spatial chemical distribution were studied by Raman and photoluminescence mapping. The crystalline quality of the heterostructures were characterized within an aberration-corrected scanning transmission electron microscope, revealing seamless interfaces with high-crystalline quality. Using field effect transistor devices we studied the transport properties across the junctions.

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Presenters

  • Humberto Gutierrez

    Physics, University of South Florida, University of South Florida, Physics, University of South Florida-Tampa

Authors

  • Prasana Sahoo

    Physics, University of South Florida, Physics, University of South Florida-Tampa

  • Shahriar Memaran

    Natl High Magnetic Field Lab, Nat. High Magn. Field Lab., Florida State University

  • Yan Xin

    Nat. High Magn. Field Lab., Florida State University

  • Luis Balicas

    Natl High Magnetic Field Lab, Nat. High Magn. Field Lab., Florida State University, FSU-NHMFL, National High Magnetic Field Lab, National High Magnetic Field Laboratory, Natl. High Magnetic Field Lab, Florida State University, High Field Magnet Lab, 1800 E. Paul Dirac Drive, National High Magnetic Field Laboratory, Natl High Magnetic Field Lab

  • Humberto Gutierrez

    Physics, University of South Florida, University of South Florida, Physics, University of South Florida-Tampa