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Towards the evaluation of defects in MoSinf2/inf using cryogenic photoluminescence spectroscopy

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    0523058 - ÚFCH JH 2021 RIV GB eng J - Journal Article
    Verhagen, T. - Guerra, Valentino Libero Pio - Haider, Golam - Kalbáč, Martin - Vejpravová, J.
    Towards the evaluation of defects in MoSinf2/inf using cryogenic photoluminescence spectroscopy.
    Nanoscale. Roč. 12, č. 5 (2020), s. 3019-3028. ISSN 2040-3364. E-ISSN 2040-3372
    R&D Projects: GA ČR GA18-20357S; GA MŠk(CZ) EF16_013/0001821; GA MŠk(CZ) LM2015073
    EU Projects: European Commission(XE) 716265
    Institutional support: RVO:61388955
    Keywords : Molybdenum compounds * Transition metals * Dichalcogenides TMDs
    Subject RIV: CF - Physical ; Theoretical Chemistry
    OECD category: Physical chemistry
    Impact factor: 7.790, year: 2020
    Method of publishing: Open access

    Characterization of the type and density of defects in two-dimensional (2D) transition metal dichalcogenides (TMDs) is important as the nature of these defects strongly influences the electronic and optical properties of the material, especially its photoluminescence (PL). Defect characterization is not as straightforward as it is for graphene films, where the D and D′ Raman scattering modes easily indicate the density and type of defects in the graphene layer. Thus, in addition to the Raman scattering analysis, other spectroscopic techniques are necessary to perform detailed characterization of atomically thin TMD layers. We demonstrate that PL spectroscopy performed at liquid helium temperatures reveals the key fingerprints of defects in TMDs and hence provides valuable information about their origin and concentration. In our study, we address defects in chemical vapor deposition (CVD)-grown MoS2 monolayers. A significant difference is observed between the as-grown monolayers compared with the CVD-grown monolayers transferred onto a Si/SiO2 substrate, which contain extra defects due to the transfer process. We demonstrate that the temperature-dependent Raman and PL micro-spectroscopy techniques enable disentangling the contributions and locations of various defect types in TMD systems.
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