What do charge-transfer states look like at D-A junctions?

Alberto Salleo^a

^aStanford University, Stanford, CA 94305, United States

International Conference on Hybrid and Organic Photovoltaics
Proceedings of International Conference on Hybrid and Organic Photovoltaics 2015 (HOPV15)

Roma, Italy, 2015 May 11th - 13th

Organizer: Filippo De Angelis

Invited Speaker, Alberto Salleo, presentation 295
Publication date: 5th February 2015

The process of charge generation in organic photovoltaics proceeds through the formation of a charge transfer complex. In this species, a hole on the donor molecule is found near an electron on the acceptor molecule. The energy of the charge transfer complex plays the role of the effective bandgap in organic photovoltaics and is strongly correlated to the open-circuit voltage of the solar cell. Furthermore, because current is generated by the dissociation of charge transfer complexes, And yet, for all their importance, we still know little about the structure-property relationships of these species. One reason for this situation is the inherent disorder of donor-acceptor interfaces, which impedes systematic studies. In this talk I will present results on well-defined donor-acceptor interfaces obtained in bimolecular crystals, which show that the amount of active donor-acceptor interface can be controlled by processing and measured. Furthermore, dilute ternary blends with an excess of fullerenes will be used to address the issue of delocalization of charge-transfer states and its effect on open-circuit voltage. Finally, we will also address the effect of energetic disorder at the interface. These simple model systems demonstrate that there is much to be learned about the structure-property relationships of charge transfer states.

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