Small molecular push–pull donors for organic photovoltaics: effect of the heterocyclic π-spacer
Résumé
A series of (D-pi-A) small push-pull molecules involving a triphenyl-amine electron-rich group (D) connected to a dicyanovinyl electron-deficient unit (A) through different chalcogenophene type p-connectors has been synthesized. Optical and electrochemical results reveal that the replacement of furan by thiophene and selenophene leads to a progressive decrease of the optical band gap of the material and to a parallel increase of hole mobility and power conversion efficiency (PCE). Thus, a PCE of 3.33% has been obtained for a simple air-processed solar cell involving the selenophene-based donor and the [6,6]-phenyl-C 61-butyric acid methyl ester (PC 61 BM) as the acceptor.
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Publi90-RSC Adv-Push pull-Furane-Thiophene-Selenophene.pdf (770.44 Ko)
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