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Identifier 000442070
Title Photochemical doping of monolayer (1L) WSe2
Alternative Title Φωτοχημικός εμπλουτισμός μονοστρωματικού κρυστάλλου δισελενιδίου βολφραμίου (1L) WSe2
Author Κατσιπουλάκη, Ειρήνη Ι.
Thesis advisor Στρατάκης, Εμμανουήλ
Κιοσέουγλου, Γεώργιος
Abstract Two-dimensional (2D) layered materials display strong optical properties, showing promise for applications towards future optoelectronic devices. Monolayers Transition metal dichalcogenides (TMDs) belongs to this class of materials. Due to their tunable direct bandgap in the visible range at the K-point of the Brillouin zone, they are ideal candidates for fieldeffect transistors (FETs), light-emitting diodes (LEDs), photovoltaics etc. In addition, optical control of valley polarization is one of the most fascinating properties of TMDs monolayers which make them promising candidates for valleytronic applications such as transport and store information. Mechanically exfoliated WSe2 monolayer (1L-WSe2) is studied during this thesis. In particular, Photoluminescence, Raman and Reflectivity properties are studied and how these properties are affected by a photoinduced doping method, that is photochlorination. The whole study was executed from 78K to room temperature. In the case of 1L-WSe2, this doping method induces n-type doping (increase of the electron density) to the specific semiconductor, due to the domination of the charged exciton peak of the photoluminescence spectrum after photochlorination. This fact is also confirmed from spin-valley polarization experiments due to the enhancement of circular polarization of the neutral exciton after the doping. The importance of this study is that via doping on 2D TMDs, properties such as band structure, catalytic activity, morphology, and electronic and optic properties are significantly improved.
Language English, Greek
Subject 2D crystals
Διδιάστατοι κρύσταλλοι
Issue date 2021-11-19
Collection   School/Department--School of Sciences and Engineering--Department of Physics--Post-graduate theses
  Type of Work--Post-graduate theses
Permanent Link https://elocus.lib.uoc.gr//dlib/e/3/4/metadata-dlib-1631606418-103189-14108.tkl Bookmark and Share
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