Direct Visualization of Electric-Field-Induced Structural Dynamics in Monolayer Transition Metal Dichalcogenides

Murthy, Akshay A.; Stanev, Teodor K.; dos Reis, Roberto; Hao, Shiqiang; Wolverton, Christopher; Stern, Nathaniel P.; Dravid, Vinayak P.

doi:10.1021/acsnano.9b06581

Title: Direct Visualization of Electric-Field-Induced Structural Dynamics in Monolayer Transition Metal Dichalcogenides

Journal Article · 31 January 2020 · ACS Nano

DOI: https://doi.org/10.1021/acsnano.9b06581 · OSTI ID:1778876

^[1]; Stanev, Teodor K. ^[2]; dos Reis, Roberto ^[3];

^[2];

^[4]

Northwestern Univ., Evanston, IL (United States). International Institute for Nanotechnology (IIN); Northwestern University
Northwestern Univ., Evanston, IL (United States)
Northwestern Univ., Evanston, IL (United States). Northwestern University Atomic and Nanoscale Characterization Experimental (NUANCE) Center
Northwestern Univ., Evanston, IL (United States). International Institute for Nanotechnology (IIN), and Northwestern University Atomic and Nanoscale Characterization Experimental (NUANCE) Center

Layered transition metal dichalcogenides offer many attractive features for next-generation low-dimensional device geometries. Due to the practical and fabrication challenges related to in situ methods, the atomistic dynamics that give rise to realizable macroscopic device properties are often unclear. Here in this study, in situ transmission electron microscopy techniques are utilized in order to understand the structural dynamics at play, especially at interfaces and defects, in the prototypical film of monolayer MoS₂ under electrical bias. Through our sample fabrication process, we clearly identify the presence of mass transport in the presence of a lateral electric field. In particular, we observe that the voids present at grain boundaries combine to induce structural deformation. The electric field mediates a net vacancy flux from the grain boundary interior to the exposed surface edge sites that leaves molybdenum clusters in its wake. Following the initial biasing cycles, however, the mass flow is largely diminished and the resultant structure remains stable over repeated biasing. We believe insights from this work can help explain observations of nonuniform heating and preferential oxidation at grain boundary sites in these materials.

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Research Organization:: Northwestern Univ., Evanston, IL (United States)

Sponsoring Organization:: Keck Foundation; National Science Foundation (NSF); US Department of the Navy, Office of Naval Research (ONR); USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC0014520

OSTI ID:: 1778876

Journal Information:: ACS Nano, Journal Name: ACS Nano Journal Issue: 2 Vol. 14; ISSN 1936-0851

Publisher:: American Chemical Society (ACS)Copyright Statement

Country of Publication:: United States

Language:: English

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Title: Direct Visualization of Electric-Field-Induced Structural Dynamics in Monolayer Transition Metal Dichalcogenides

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