Investigation of spatially localized defects in synthetic WS2 monolayers.
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2022
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Abstract
While the spatially nonhomogeneous light emission from synthetic WS2 monolayers is frequently reported in
the literature, the nature of this phenomenon still requires thoughtful investigation. Here, we combine several
characterization techniques (optical imaging, scanning probe and electron microscopy) along with density func-
tional theory to investigate the presence of substitutional doping localized at narrow regions along the S zigzag
edge of WS2 monolayers. We verified that photoluminescence quenching along narrow regions is not related to
grain boundaries but to substitutional impurities of lighter metals at the W sites, which modify the radiative and
nonradiative decay channels. We also found potential candidates for occupying the W site through ADF-STEM
analysis and discussed their impact on photoluminescence quenching by performing density functional theory
calculations. Our findings shed light on how atomic defects introduced during WS2 monolayer’s synthesis impact
the crystalline quality and, therefore, the development of high-performance optoelectronic devices based on
semiconducting 2D materials.
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ROSA, B. L. T. et al. Investigation of spatially localized defects in synthetic WS2 monolayers. Physical Review B, v. 106, n. 11, artigo 115301, 2022. Disponível em: <https://journals.aps.org/prb/abstract/10.1103/PhysRevB.106.115301>. Acesso em: 06 jul. 2023.