Enhanced open-circuit voltage in polymer solar cells by dithieno[3,2-b:2′,3′-d]pyrrole N-acylation

Wouter Vanormelingen, Jurgen Kesters, Pieter Verstappen, Jeroen Drijkoningen, Julija Kudrjasova, Simplice Koudjina, Vincent Liégeois, Benoît Champagne, Jean Manca, Laurence Lutsen, Dirk Vanderzande, Wouter Maes

Résultats de recherche: Contribution à un journal/une revueArticleRevue par des pairs

Résumé

A series of low bandgap copolymers composed of N-acyl-substituted dithieno[3,2-b:2′,3′-d]pyrroles (DTPs) as the electron rich donor constituents (with various alkyl side chain patterns) combined with different electron deficient acceptor building blocks are developed for polymer solar cell applications. Due to the introduction of the N-acyl substituents, the HOMO energy levels of the push-pull copolymers decrease as compared to the N-alkyl-DTP analogues, resulting in an increased open-circuit voltage (V oc) and hence solar cell performance. For an N-acyl-DTP-alt-thieno[3, 4-c]pyrrole-4,6-dione (PDTP-TPD) copolymer a bulk heterojunction device with a Voc up to 0.80 V and a power conversion efficiency of 4.0% is obtained, the highest value for DTP-based polymer materials to date. Moreover, by implementation of a conjugated polyelectrolyte cathode interlayer the short-circuit current noticeably increases, enhancing the solar cell efficiency to 5.8%.

langue originaleAnglais
Pages (de - à)7535-7545
Nombre de pages11
journalJournal of Materials Chemistry A
Volume2
Numéro de publication20
Les DOIs
Etat de la publicationPublié - 28 mai 2014

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