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Identifier |
000442070 |
Title |
Photochemical doping of monolayer (1L) WSe2 |
Alternative Title |
Φωτοχημικός εμπλουτισμός μονοστρωματικού κρυστάλλου δισελενιδίου βολφραμίου (1L) WSe2 |
Author
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Κατσιπουλάκη, Ειρήνη Ι.
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Thesis advisor
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Στρατάκης, Εμμανουήλ
Κιοσέουγλου, Γεώργιος
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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.
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Language |
English, Greek |
Subject |
2D crystals |
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Διδιάστατοι κρύσταλλοι |
Issue date |
2021-11-19 |
Collection
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School/Department--School of Sciences and Engineering--Department of Physics--Post-graduate theses
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Type of Work--Post-graduate theses
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Permanent Link |
https://elocus.lib.uoc.gr//dlib/e/3/4/metadata-dlib-1631606418-103189-14108.tkl
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