van der Waals Epitaxy, Superlubricity, and Polarization of the 2D Ferroelectric SnS
Source abstract
Abstract
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.
Source: openalex_inverted_index · Quality: baseline
Research context
OpenAlex topics: Electronic and Structural Properties of Oxides · 2D Materials and Applications · Ferroelectric and Piezoelectric Materials
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Department of Materials Science and Engineering, Northwestern University, Evanston, Illinois 60208, United States
Center for Nanoscale Materials, Argonne National Laboratory, Lemont, Illinois 60439, United States
Northwestern Argonne Institute of Science and Engineering, Evanston, Illinois 60208, United States
NUANCE Center, 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
Funding
Basic Energy Sciences · Division of Electrical, Communications and Cyber Systems · 3M · Division of Materials Research
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