Ottone, C., Berrouard, P., Louarn, G., Beaupre, S., Gendron, D., Zagorska, M., Rannou, P., Najari, A., Sadki, S., Leclerc, M. & Pron, A. (2012) Donor-acceptor alternating copolymers containing thienopyrroledione electron accepting units: preparation, redox behaviour, and application to photovoltaic cells. Polym. Chem. 3 2355–2365.
Added by: Laurent Cournède (2016-03-10 21:28:40)
|Type de référence: Article
Numéro d'identification (ISBN etc.): 1759-9954
Clé BibTeX: Ottone2012
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Mots-clés: field, molecular-weight, polymers, regioregular poly(3-hexylthiophene)
Créateurs: Beaupre, Berrouard, Gendron, Leclerc, Louarn, Najari, Ottone, Pron, Rannou, Sadki, Zagorska
Collection: Polym. Chem.
Consultations : 5/404
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Four new donor-acceptor semiconducting alternating copolymers consisting of thienopyrroledione (TPD) electron-accepting sub-units and either 2,7-carbazole or dialkoxy substituted benzodithiophene electron-donating moieties were prepared either by Suzuki or Stille coupling. Analytical size exclusion chromatography (SEC) was used to fractionate the copolymer with 1 : 1 thienopyrroledione to carbazole ratio into 9 sharp fractions. The effective conjugation length (35 aromatic rings) was determined on the basis of the dependence of lambda(max) of the pi-pi* band on the degree of polymerization, DPn. All four polymers showed similar supramolecular organization resembling that of poly(3-alkylthiophene) s since the mechanism of the self-assembly was the same in both cases: pi-stacking of the pi-conjugated polymer backbones and interdigitation of n-alkyl side chains. As shown by cyclic voltammetry studies, three copolymers showed band gaps inferior to 2 eV with HOMO and LUMO levels ranging between -5.62 eV to -.08 eV and -.53 eV to -3.13 eV, respectively. UV-vis-NIR spectroelectrochemical investigations confirmed the results obtained by cyclic voltammetry, enabling in addition more precise determination of the HOMO level. Raman spectroelectrochemical studies showed that the polymer with 1 : 1 thienopyrroledione to carbazole ratio is prone to oxidative degradation, consistent with cyclic voltammetry studies. A bulk-heterojunction solar cell was fabricated from the copolymer consisting of thienopyrroledione and dialkoxy substituted benzodithiophene. A power conversion efficiency of 1.63\% was achieved for non-optimized devices.
Added by: Laurent Cournède