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Bayramov, Ayaz H.; Bagiyev, Elnur A.; Alizade, Elvin H.; Jalilli, Javid N.; Mamedov, Nazim T.; Jahangirli, Zakir A.; Asadullayeva, Saida G.; Aliyeva, Yegana N.; Cuscunà, Massimo; Lorenzo, Daniela; Esposito, Marco; Balestra, Gianluca; Simeone, Daniela; Tobaldi, David Maria; Abou-Ras, Daniel; Schorr, Susan
Nanomaterials, 01/2024, Letnik: 14, Številka: 1Journal Article
MoS2 is a two-dimensional layered transition metal dichalcogenide with unique electronic and optical properties. The fabrication of ultrathin MoS2 is vitally important, since interlayer interactions in its ultrathin varieties will become thickness-dependent, providing thickness-governed tunability and diverse applications of those properties. Unlike with a number of studies that have reported detailed information on direct bandgap emission from MoS2 monolayers, reliable experimental evidence for thickness-induced evolution or transformation of the indirect bandgap remains scarce. Here, the sulfurization of MoO3 thin films with nominal thicknesses of 30 nm, 5 nm and 3 nm was performed. All sulfurized samples were examined at room temperature with spectroscopic ellipsometry and photoluminescence spectroscopy to obtain information about their dielectric function and edge emission spectra. This investigation unveiled an indirect-to-indirect crossover between the transitions, associated with two different Λ and K valleys of the MoS2 conduction band, by thinning its thickness down to a few layers.
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JCR | SNIP | JCR | SNIP | JCR | SNIP | JCR | SNIP |
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