A [3,2-b]thienothiophene-alt-benzothiadiazole copolymer for photovoltaic applications: design, synthesis, material characterization and device performances

Laure Biniek 1, 2 Christos L. Chochos 1, * Nicolas Leclerc 1, * Georges Hadziioannou 3, 4 Joannis K. Kallitsis 5 Rony Bechara 2 Patrick Lévêque 2 Thomas Heiser 2
* Auteur correspondant
1 Univ Strasbourg - Ecole Europ Chim Polym & Mat, Lab Ing
2 Univ Strasbourg, Inst Elect Solide & Syst
3 LCPO - Laboratoire de Chimie des Polymères Organiques
4 TEAM 4 LCPO
5 Dept Chem, Univ Patras, Greece
Abstract : The synthesis of a new alternating copolymer (PTBzT(2)-C12) based on a thiophene-benzothiadiazole-thiophene (TBzT) segment and a thieno[3,2-b]thiophene unit and its utilization as electron donor in photovoltaic bulk heterojunctions are reported. The copolymer has been obtained via a Stille cross-coupling reaction. The material's optical and electrochemical properties, in solution or in thin films, have been investigated using UV-visible absorption as well as photoluminescence spectroscopy and cyclic voltammetry. A significant red-shift of the absorption edge is observed during film formation, leading to an optical bandgap of 1.88 eV. The polymer ionisation potential is as high as 5.3 eV and makes the material particularly interesting for photovoltaic applications since it is a prerequisite for high open circuit voltages and better chemical stability. Bulk heterojunction solar cells using blends of the copolymer, as the electron donor, and [6,6]-phenyl-C61-butyric acid methyl ester (PCBM), as the electron transporting material, have been elaborated. A power conversion efficiency of 1% is achieved with a 1:4 PTBzT(2)-C12:PCBM weight ratio and a 30 nm semi-transparent active layer. The open-circuit voltage is equal to 0.74 V and agrees with the expected value. It is anticipated from the copolymer optoelectronic properties, that this novel material should allow power conversion efficiencies above 5% after further optimization of the processing steps.
Keywords : CARRIER MOBILITY SELF-ORGANIZATION ORGANIC PHOTOVOLTAICS POLYMER SOLAR-CELLS THIN-FILM TRANSISTORS NARROW-BAND-GAP POLYFLUORENE COPOLYMER/FULLERENE BLENDS FIELD-EFFECT TRANSISTORS PI-CONJUGATED SYSTEMS ACCEPTOR UNITS
Type de document :
Article dans une revue
Journal of Materials Chemistry, Royal Society of Chemistry, 2009, 19 (28), pp.4946-4951. 〈10.1039/b819177h〉
Domaine :
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https://hal.archives-ouvertes.fr/hal-00945107
Contributeur : Dominique Richard <>
Soumis le : mardi 11 février 2014 - 16:29:19
Dernière modification le : jeudi 11 janvier 2018 - 06:28:09

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Laure Biniek, Christos L. Chochos, Nicolas Leclerc, Georges Hadziioannou, Joannis K. Kallitsis, et al.. A [3,2-b]thienothiophene-alt-benzothiadiazole copolymer for photovoltaic applications: design, synthesis, material characterization and device performances. Journal of Materials Chemistry, Royal Society of Chemistry, 2009, 19 (28), pp.4946-4951. 〈10.1039/b819177h〉. 〈hal-00945107〉

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