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Identifier

000399904

Title

Χημική τροποποίηση του Οξειδίου του Γραφενίου με μόριο Πορφυρίνης και ενσωμάτωσή του σε οργανικές φωτοβολταϊκές διατάξεις

Alternative Title

Chemical functionalization of Graphene Oxide with Porphyrin and incorporation in organic photovoltaics

Author

Ορφανουδάκη, Ευαγγελία-Άννα Σ.

Thesis advisor

Κουτσολέλος, Αθανάσιος

Reviewer

Κυμάκης, Εμμανουήλ
Πετρίδης, Κωνσταντίνος

Abstract

A graphene-based porphyrin molecule (GO-TPP) was synthesized by covalent linkage of graphene oxide (GO) with 5-(4-aminophenyl)-10,15,20-triphenyl) porphyrin (TPP-NH₂). The yielded graphene-based material is a donor-acceptor (D-A) molecule, exhibiting strong intermolecular interaction between the GO core (A) and the covalently anchored porphyrin molecule (D). To demonstrate the universal role of GO-TPP as electron cascade material, ternary blend organic photovoltaics based on [6,6]-phenyl-C₇₁-butyric-acid-methyl-ester (PC₇₁BM) as electron acceptor material and two different polymer donor materials, the poly [N-9’-hepta-decanyl-2,7-carbazole-alt-5,5-(40,70-di-2-thienyl-20,10,30-benzothiadiazole)] (PCDTBT) and the high efficient poly ({4,8-bis[(2-ethylhexyl)oxy]benzo[1,2-b:4,5-b’]dithiophene-2,6-diyl}{3-fluoro-2-[(2-ethylhexyl) carbonyl]thieno [3,4-b]thiophenediyl} (PTB7), were fabricated. The addition of GO-TPP into the active layer implies continuous percolation paths between the D-A interfaces, enhancing charge transport, reducing exciton recombination and thus improving the photovoltaic performance of the device. A simultaneous increase of short circuit current density (J_sc), open-circuit voltage (V_oc) and fill factor (FF), compared to PTB7:PC71BM reference cell, led to an improved power conversion efficiency (PCE) of 8.81% for the PTB7: GO-TPP:PC₇₁BM-based device, owing mainly to the more efficient energy level offset between the active layer components.

Language

Greek

Subject

Ternary blend in organic photovoltaics

Tριαδικό μίγμα διεσπαρμένης ετεροεπαφής στο φωτοενεργό στρώμα

Οξείδιο του γραφενίου

Πορφυρίνη

Issue date

2016-03-18

Collection

School/Department--School of Sciences and Engineering--Department of Chemistry--Post-graduate theses

Type of Work--Post-graduate theses