Efficient dyad-based organic solar cells with a highly crystalline donor group.

A novel oligo(p-phenylenevinylene)(OPV)-fullerene dyad, with strong intermolecular pi-pi interactions between the donor groups, led to improvements in the fill factor and power conversion efficiency of dyad-based solar cells of up to 0.44 and 1.28%, respectively, which are the highest values reported for dyad-based solar cells to date.