Thiophene-containing poly(arylene-ethynylene)-alt-poly(arylene-vinylene)s: Synthesis, characterisation and optical properties |
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Authors: | Daniel Ayuk Mbi Egbe Le Huong Nguyen David Mühlbacher |
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Affiliation: | a Institut für Organische Chemie und Makromolekulare Chemie der Friedrich-Schiller Universität Jena, Humboldtstr. 10, D-07743 Jena, Germany b Linz Insitute for Organic Solar Cells (LIOS), Johannes Kepler University, Altenbergerstr. 69, A-4040 Linz, Austria c Laboratoire de Recherche sur les Polymères, CNRS-UMR 7581, 2-8 rue Henri Dunant, 94320 Thiais, France d Konarka Austria, Forschungs-und Entwicklungs GmbH, Gruberstr. 40-42, A-4020 Linz, Austria |
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Abstract: | This work describes the synthesis and characterisation of two types of thiophene-containing poly(arylene-ethynylene)-alt-poly(arylene-vinylene)s (PAE-PAV) copolymers, whose repeating units (-Ph-C C-Th-CH CH-Ph-CH CH-)n, 5, and (-Th-C C-Ph-C C-Th-CH CH-Ph-CH CH-)n, 8a-c, consist, respectively, of a 1:2 and a 2:2 ratio of triple bond/double bond moieties. Comparison of their photophysical, electrochemical and photovoltaic properties has been carried out. Although similar electrochemical data (HOMO: −5.43 eV, LUMO: ∼−3.15 eV, ) as well as identical thin film absorption behaviour (λa=500 nm, ) were obtained for both types of materials, significant differences in their thin film photoluminescence behaviour and photovoltaic properties were observed. While polymer 5 shows a fluorescence maximum at λe=568 nm (with a fluorescence quantum yield of Φf=7%), a total fluorescence quenching was observed in 8. Far better photovoltaic performance was obtained from solar cells (set up: ITO/PEDOT:PSS/active layer/LiF/Al; active layer consisting of 5 or 8b as donor and PCBM as acceptor in a 1:3 ratio by weight) designed from 5 than from 8b. Open circuit voltage, VOC, as high as 900 mV and power conversion efficiency, ηAM1.5, around 1.2% were obtained. This can be attributed to the 1:2 triple bond/double bond ratio as well as the grafting of shorter octyloxy and 2-ethylhexyloxy side chains in 5 and to its comparatively higher molecular-weight. |
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Keywords: | Photoactive polymers Organic photovoltaic devices Thiophene-containing PPV derivatives |
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