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Domain Architectures and Grain Boundaries in Chemical Vapor Deposited Highly Anisotropic ReS2 Monolayer Films
journal contribution
posted on 2016-08-04, 00:00 authored by Kedi Wu, Bin Chen, Sijie Yang, Gang Wang, Wilson Kong, Hui Cai, Toshihiro Aoki, Emmanuel Soignard, Xavier Marie, Aliya Yano, Aslihan Suslu, Bernhard Urbaszek, Sefaattin TongayRecent studies have
shown that vapor phase synthesis of structurally isotropic two-dimensional
(2D) MoS2 and WS2 produces well-defined domains
with clean grain boundaries (GBs). This is anticipated to be vastly
different for 2D anisotropic materials like ReS2 mainly
due to large anisotropy in interfacial energy imposed by its distorted
1T crystal structure and formation of signature Re-chains along [010] b-axis direction. Here, we provide first insight on domain
architecture on chemical vapor deposited (CVD) ReS2 domains
using high-resolution scanning transmission electron microscopy, angle-resolved
nano-Raman spectroscopy, reflectivity, and atomic force microscopy
measurements. Results provide ways to achieve crystalline anisotropy
in CVD ReS2, establish domain architecture of high symmetry
ReS2 flakes, and determine Re-chain orientation within
subdomains. Results also provide a first atomic resolution look at
ReS2 GBs, and surprisingly we find that cluster and vacancy
defects, formed by collusion of Re-chains at the GBs, dramatically
impact the crystal structure by changing the Re-chain direction and
rotating Re-chains 180° along their b-axis.
Overall results not only shed first light on domain architecture and
structure of anisotropic 2D systems but also allow one to attain much
desired crystalline anisotropy in CVD grown ReS2 for the
first time for tangible applications in photonics and optoelectronics
where direction-dependent dichroic and linearly polarized material
properties are required.
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Keywords
anisotropyReS 2 GBsWSanisotropic 2 D systemssymmetry ReS 2 flakesReS 2force microscopy measurementsChemical Vapor Depositedvapor phase synthesisangle-resolved nano-Raman spectroscopyAnisotropic ReS 2 Monolayer Films1 T crystal structureReS 2 domainsCVD ReS 2domain architectureRe-chainscanning transmission electron microscopy2 D anisotropic materials
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