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Identifier |
000444738 |
Title |
Fabricating new perovskite morphologies and anchoring them on functional substrates |
Alternative Title |
Δημιουργία νέων περοβσκιτικών μορφολογιών και πρόσδεση αυτών σε λειτουργικά υποστρώματα |
Author
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Κιοκεκλή, Σερπίλ
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Thesis advisor
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Κιοσέογλου, Γεώργιος
Στρατάκης, Εμμανουήλ
Στούμπος, Κωνσταντίνος
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Abstract |
In the past few years, metal halide perovskite nanocrystals have emerged due to their
exceptional optical properties. The most attractive trait of these materials is the properties
tunability by composition, shape or size alterations. The synthesis of highly anisotropic
nanocrystals is even more promising, as strong quantum confinement imposed by one
(nanorods/nanowires) or two (nanoplatelets) dimensions give rise to higher exciton binding
energy and narrow emission linewidth, which are of great importance in LEDs and lasing.
Nevertheless, complications concerning the ultra-thin metal halide nanocrystals are
governed by instability towards environmental conditions (light and moisture) and
susceptibility to aggregate and/or breaking down. Notably, the aim of this project was
oriented towards the investigation of a reproducible protocol, and thus, the second part of
the initial project title could not be achieved.
Α facile, ambient-conditions chemical protocol is presented to obtain uniform and
ultra-small 2D CsPbBr3 nanoplatelets, here called nanorods due to their size and morphology.
The synthesis is based on the ligand-assisted precipitation method, by combining low
reaction temperature, dilution and ambient light to control the growth of the thin
nanocrystals. No complex chemistry apparatus or inert gas flow are needed. Τhe nanorods
are homogeneous in size, with 7.8±1.4 nm length and 2.7±0.5 nm width, which corresponds
to three monolayers. The nanorod colloidal solution is strong PL active emitting in blue
spectral region indicating strong quantum confinement effects, as their width is below the
Bohr radius reported for this material.
These ultra-thin quantum-confined nanorods are among the thinnest in the literature
and could be promising candidate in making efficient LEDs. Furthermore, this cost-effective
colloidal method by careful regulation of the three important parameters (temperature,
dilution, exposure time to light) can be used for the fabrication of other 2D nanocrystals.
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Language |
English |
Subject |
Nanocrystals |
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Νανοκρυστάλλοι |
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Νανοπλακίδια |
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Νανοράβδοι |
Issue date |
2022-03-18 |
Collection
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School/Department--School of Sciences and Engineering--Department of Materials Science and Technology--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/6/1/b/metadata-dlib-1641209695-810865-20327.tkl
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Views |
1224 |
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