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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

Καλαφατάκη, Γεωργία Δ.

Thesis advisor

Κουτσολέλος, Αθανάσιος

Reviewer

Κυμάκης, Εμμανουήλ
Πετρίδης, Κωνσταντίνος

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.

Language

Greek

Subject

Inverted structure

Organic photovoltaic

Ανεστραμμένη διάταξη

Ανθρακένιο

Διθειενοβενζοθειαδιαζόλη

Οργανικό φωτοβολταϊκό

Περυλένιο

Τριαδικό μείγμα

Issue date