A fullerene-based dyad for organic photovoltaic cells

摘要: We describe the synthesis and photophysical properties of a fullerene–azothiophene dyad, as well photovoltaic performance cells incorporating dyad surface morphology device active layer. The results have been compared with those obtained on blend, in equimolar ratio, between azothiophene dye fulleropyrrolidine. This revealed pivotal role played by both behaviour performance. While scanning force microscopy studies for exhibited fairly smooth surfaces, case blend they displayed micrometre-scale phase segregation two components. suggest that, latter case, lack photo-induced electron transfer evidenced study, relevant reduction cell (up to more than one order magnitude respect dyad), could be ascribed different morphology. Because strong optical absorption visible region, dyad-based solar gave notable if reported literature other donor–acceptor linked systems. A power-conversion efficiency 0.37% under 80-mW cm-2 white-light illumination has achieved tuning thickness film, though is not yet optimised terms transfer.