Dye-functionalized head-to-tail coupled oligo(3-hexylthiophenes)—perylene–oligothiophene dyads for photovoltaic applications
作者:Jens Cremer、Elena Mena-Osteritz、Neil G. Pschierer、Klaus Müllen、Peter Bäuerle
DOI:10.1039/b414817g
日期:——
A series of novel donorâacceptor 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 structureâproperty relationships have been established which give vital information for the fabrication of photovoltaic devices. Because the synthesized perylenylâoligothiophenes 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.