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Title Optoelectronic properties of WS2/graphene heterostructures
Author Πασπαλίδης, Χρίστος
Thesis advisor Κιοσέογλου, Γεώργιος
Abstract During the last decade, the interest in investigating two dimensional materials was rapidly increased. Particularly, a class of materials known as Transition Metal Dichalcogenides (TMDs) exhibit promising properties in their two-dimensional form, making them attractive for future fundamental studies and applications. Some challenges considering the isolation and identification of TMD monolayers have been dealt through the introduction of a standard spectroscopic set of techniques such as Raman, Absorbance and Photoluminescence. For the last couple of years many studies have been focused in the examination of WS2/graphene heterostructures in order to explore their optoelectronic properties. The aim of this dissertation is two-fold. Firstly, the fabrication of the heterostructure samples was carried out using mechanical exfoliation for isolating WS2 monolayers and few-layer graphene flakes. The exfoliated flakes were subsequently identified and characterized using optical microscopy and a combination of the three spectroscopic techniques. Additionally, a deterministic transfer setup was used for the stamping procedure in combination with the annealing treatment of samples. The importance of annealing for the coupling of the layers was confirmed and highlighted throughout the project. The second goal of this work was the spectroscopic study of the excitonic properties of WS2/graphene heterostructures, which are strongly correlated with their optoelectronic properties. Therefore, the optical response of the sandwiched sample was examined under temperature dependent Photoluminescence in the range of 78K-300K.
Language English
Issue date 2020-07-24
Collection   Faculty/Department--Faculty of Sciences and Engineering--Department of Physics--Graduate theses
  Type of Work
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