Charge photogeneration in polythiophene-perylene diimide blend films.

Transient absorption spectroscopy is employed to monitor charge photogeneration in polythiophene-perylene diimide blend films; in contrast to polythiophene-PCBM blends, efficient charge photogeneration is observed even for small energetic driving forces.

Charge carrier formation in polythiophene/fullerene blend films studied by transient absorption spectroscopy.

We report herein a comparison of the photophysics of a series of polythiophenes with ionization potentials ranging from 4.8 to 5.6 eV as pristine films and when blended with 5 wt % 1-(3-methoxycarbonyl)propyl-1-phenyl-[6,6]C61 (PCBM).

Radical ion pair mediated triplet formation in polymer-fullerene blend films.

Efficient triplet formation is observed for films of high ionisation potential polythiophenes blended with a fullerene derivative, and assigned to formation via geminate charge recombination of bound radical ion pair states.