Dresden 2017 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 64: Poster: Photovoltaics and Optics

HL 64.18: Poster

Mittwoch, 22. März 2017, 15:00–19:00, P1C

Reorganization and disorder effects of the charge transfer state in organic solar cells — •Clemens Göhler and Carsten Deibel — Institut für Physik, Technische Universität Chemnitz, 09126 Chemnitz, Germany

The efficiency of organic solar cells is directly linked to their ability to dissociate light-induced excitons into separate charge carriers. By using a bulk-heterojunction (BHJ) with a mixture of donor and acceptor semiconductors, a charge-transfer (CT) state between the acceptor LUMO and donor HOMO is created. Due to its lower binding energy, the exciton dissociation increases via the CT state.

This found state is believed to be affected by both its reorganization energy and ensemble disorder effects. Therefore, we expect a complex temperature dependence of both the CT states' energy and line-broadening.

We use electrooptical spectroscopy with respect to absorption and emission of the CT state. By measuring the ensemble CT energy and linewidth while varying the cell-temperature over a broad range, we are able to unravel whether molecular reorganization energy or disorder have a stronger influence on the CT state of common polymer-fullerene BHJs.