title: Dye-functionalized head-to-tail coupled oligo(3-hexylthiophenes)-perylene-oligothiophene dyads for photovoltaic applications.
abstract: A series of novel donor-acceptor systems, consisting of head-to-tail coupled oligo(3-hexylthiophene)s covalently linked to perylenemonoimide, is described. These hybrid molecules, which differ by the length of the oligothiophene units from a monothiophene up to an octathiophene, were created via effective palladium-catalyzed Negishi and Suzuki cross-coupling reactions in good to excellent yields. The optical and electrochemical properties of these compounds were determined and based on this series structure-property relationships have been established which give vital information for the fabrication of photovoltaic devices. Because the synthesized perylenyl-oligothiophenes distinguish themselves by a high absorption between 300 and 550 nm and an almost complete fluorescence quenching of the perylene acceptor, they meet the requirements for organic solar cells.
authors.affiliation: Department Organic Chemistry II (Organic Materials and Combinatorial Chemistry), University of Ulm, Albert-Einstein-Allee 11, 89081 Ulm, Germany.
authors.forename: Jens
authors.initials: J
authors.lastname: Cremer
authors.forename: Elena
authors.initials: E
authors.lastname: Mena-Osteritz
authors.forename: Neil G
authors.initials: NG
authors.lastname: Pschierer
authors.forename: Klaus
authors.initials: K
authors.lastname: Müllen
authors.forename: Peter
authors.initials: P
authors.lastname: Bäuerle