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Identifier |
000421558 |
Title |
Σύνθεση και Χαρακτηρισμός 4,7- Διθειενοβενζοθειαδιαζόλης με Κυανοβινυλενικούς Δεσμούς και Διιμιδίου Περυλενίου-Ανθρακενίου για την Κατασκευή Οργανικών Φωτοβολταϊκών Διατάξεων Τριαδικού Μίγματος |
Alternative Title |
Synthesis and Characterization of 4,7-Dithienobenzothiadiazole Derivative with Cyano-vinylene Bonds and Perylene-Anthracene bisimide incorporated into Ternary Organic Solar Cells |
Author
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Καλαφατάκη, Γεωργία Δ.
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Thesis advisor
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Κουτσολέλος, Αθανάσιος
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Reviewer
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Κυμάκης, Εμμανουήλ
Πετρίδης, Κωνσταντίνος
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Abstract |
In the present master thesis, two compounds T and A were synthesized. Compound T contains 4,7-dithienzobenzothiadiazole as a central unit and thiophene rings, which are bonded via a vinylene cyanide bond. The stable intramolecular charge-transfer status makes it possible to increase the optical absorption band of the compound. The absorption spectrum is broad and ranges from 300 to 700 nm. The emission of compound T occurs at 603 nm in the photoluminescence spectrum (PL). The results of cyclic voltammetry (CV) revealed the energy levels of the compound at -6.13 eV for HOMO and -3.73 eV for LUMO. Compound T was added to the standard mixed PTB7:PC71BM active layer as an active semiconductor third component to address some of the limitations of OSC binary mixtures such as PTB7: PC71BM. Adding compound T to the inverted photoactive layer created conductive electron transport pathways from the donor to the acceptor, facilitating vector transport and reducing re-entry of holes and electrons by improving the performance of the device. The most efficient ternary device is of 5% (v / v) concentration which is the only one to provide the highest Jsc, FF and PCE. Improvements in performance reached 8.11%, upon the incorporation of compound T into the binary active layer PTB7: PC71BM. Improvements of PCE over the typical PTB7 binary device: PC71BM (PCE = 7.69%) is mainly due to the charge transfer mechanism.
In addition, a symmetrical compound A with precursor molecules was synthesized by perylene and anthracene. The compound was extensively characterized by UV-Vis, FT-IR, PL, and CV spectroscopy. The absorption spectrum ranged from 300-700 nm while a photoluminescence spectrum shows a peak at 572 nm. The energy levels of the compound appeared at -6.13 eV for HOMO and -3.82 eV for LUMO. Compound A is intended to be used as an electron acceptor in organic photovoltaic devices.
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Language |
Greek |
Subject |
Inverted structure |
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Organic photovoltaic |
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Ανεστραμμένη διάταξη |
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Ανθρακένιο |
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Διθειενοβενζοθειαδιαζόλη |
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Οργανικό φωτοβολταϊκό |
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Περυλένιο |
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Τριαδικό μείγμα |
Issue date |
2019-03-27 |
Collection
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School/Department--School of Sciences and Engineering--Department of Chemistry--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/0/7/9/metadata-dlib-1552041175-806711-29471.tkl
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Views |
256 |