Thienoisoindigo end-capped molecular donors for organic photovoltaics: Effect of the central π-conjugated connector.

The synthesis, characterization and preliminary evaluation of two thienoisoindigo ( TII ) based molecules as donor materials in air processed bulk heterojunction solar cells are reported herein. The latter were built by grafting TII dyes on two different π-conjugated central cores, namely the cyclopentadithiophene and the fluorene units. Once blended with fullerene derivatives, power conversion efficiencies approaching 3% were measured, ranking amongst the highest reported value for thienoisoindigo-based molecular materials. [ABSTRACT FROM AUTHOR]