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RETURN TO ISSUEPREVFunctional Nanostruc...Functional Nanostructured Materials (including low-D carbon)NEXT

van der Waals Epitaxy, Superlubricity, and Polarization of the 2D Ferroelectric SnS

  • Michael J. Moody
    Michael J. Moody
    Department of Materials Science and Engineering, Northwestern University, Evanston, Illinois 60208, United States
  • Joshua T. Paul
    Joshua T. Paul
    Center for Nanoscale Materials, Argonne National Laboratory, Lemont, Illinois 60439, United States
    Northwestern Argonne Institute of Science and Engineering, Evanston, Illinois 60208, United States
  • Paul J. M. Smeets
    Paul J. M. Smeets
    Department of Materials Science and Engineering, Northwestern University, Evanston, Illinois 60208, United States
    NUANCE Center, Northwestern University, Evanston, Illinois 60208, United States
  • Roberto dos Reis
    Roberto dos Reis
    Department of Materials Science and Engineering, Northwestern University, Evanston, Illinois 60208, United States
  • Joon-Seok Kim
    Joon-Seok Kim
    Department of Materials Science and Engineering, Northwestern University, Evanston, Illinois 60208, United States
  • Christopher E. Mead
    Christopher E. Mead
    Department of Materials Science and Engineering, Northwestern University, Evanston, Illinois 60208, United States
  • Jonathan Tyler Gish
    Jonathan Tyler Gish
    Department of Materials Science and Engineering, Northwestern University, Evanston, Illinois 60208, United States
  • Mark C. Hersam
    Mark C. Hersam
    Department of Materials Science and Engineering, Northwestern University, Evanston, Illinois 60208, United States
    Department of Chemistry, Northwestern University, Evanston, Illinois 60208, United States
    Department of Electrical and Computer Engineering, Northwestern University, Evanston, Illinois 60208, United States
    Department of Medicine, Northwestern University, Evanston, Illinois 60208, United States
    The Materials Research Center, Northwestern University, Evanston, Illinois 60208, United States
  • Maria K. Y. Chan*
    Maria K. Y. Chan
    Center for Nanoscale Materials, Argonne National Laboratory, Lemont, Illinois 60439, United States
    Northwestern Argonne Institute of Science and Engineering, Evanston, Illinois 60208, United States
    *E-mail: [email protected]
  • , and 
  • Lincoln J. Lauhon*
    Lincoln J. Lauhon
    Department of Materials Science and Engineering, Northwestern University, Evanston, Illinois 60208, United States
    The Materials Research Center, Northwestern University, Evanston, Illinois 60208, United States
    *E-mail: [email protected]
Cite this: ACS Appl. Mater. Interfaces 2023, 15, 48, 56150–56157
Publication Date (Web):November 27, 2023
https://doi.org/10.1021/acsami.3c11931
Copyright © 2023 American Chemical Society

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    Abstract

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    Tin monosulfide (SnS) is a two-dimensional layered semiconductor that exhibits in-plane ferroelectric order at very small thicknesses and is of interest in highly scaled devices. Here we report the epitaxial growth of SnS on hexagonal boron nitride (hBN) using a pulsed metal–organic chemical vapor deposition process. Lattice matching is observed between the SnS(100) and hBN{11̅0} planes, with no evidence of strain. Atomic force microscopy reveals superlubricity along the commensurate direction of the SnS/hBN interface, and first-principles calculations suggest that friction is controlled by the edges of the SnS islands, rather than interface interactions. Differential phase contrast imaging detects remnant polarization in SnS islands with domains that are not dictated by step-edges in the SnS. The growth of ferroelectric SnS on high quality hBN substrates is a promising step toward electrically switchable ferroelectric semiconducting devices.

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