Regensburg 2013 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 65: Poster: Organic electronics and photovoltaics (CPP; jointly with HL, O)

HL 65.3: Poster

Mittwoch, 13. März 2013, 16:30–18:30, Poster C

Photophysical Processes in Polymer:PDI Solar Cells — •Dominik Gehrig, Valentin Kamm, Hannah Mangold, Ian Howard, Glauco Battagliarin, Chen Li, Klaus Müllen, and Frédéric Laquai — Max-Planck-Institute for Polymer Research, Mainz, Germany

We present the implementation of different polymers as donors in combination with new PDI-based acceptors in organic solar cells. Increasing the absorption of the photoactive layer is a rational strategy that could give rise to an enhanced photon harvesting and hence an improvement of the photocurrent. The contribution of PDI to the photocurrent generation can be proved by EQE measurements. Additionally exciton and charge carrier dynamics as well as loss mechanisms are investigated by sub-picosecond to millisecond pump-probe transient absorption spectroscopy (TA) and time-resolved photoluminescence (TRPL) spectroscopy. The former tracks the dynamics of non-radiative species whereas the latter enables the observation of emissive decay channels. Supplementary experiments like the evaluation of the morphology by AFM and charge transport experiments by the time-of-flight (TOF) technique and space-charge-limited-current (SCLC) measurements deliver additional information which allow to derive meaningful structure-property-relations.