Time-resolved Fluorescence Quenching of Polymer:Fullerenes Film

Miloslav Pekar^a, Martin Weiter^a, Martin Vala^a, Veronika Schmiedova^a, Patricie Heinrichova^a, Michal Zitnan^a

^aMaterials Research Centre, Brno University of Technology, Purkynova 464/118, Brno, 61200, Czech Republic

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

Poster, Michal Zitnan, 427
Publication date: 5th February 2015

Organic materials based solar cells have shown very rapid improvement in power conversion efficiencies reaching 12% in recent years. Understanding of photogeneration mechanism on the donor-acceptor interface could lead to faster improvement in the conversion efficiency. In our study, π-conjugated polymers MDMO-PPV and Tg-PPV act as absorbing moiety and charge transporter, while fullerene PC₆₀BM was used as electron accepting material. Exciton diffusion and Förster resonance energy transfer were investigated as competing processes to exciton extinction by fluorescence. Fluorescence quenching in blends with varying concentrations of fullerene acceptor was measured. Depending on the content of the fullerene, the rate of exciton diffusion and the rate of Förster resonance energy transfer can be controlled. The quenching of fluorescence was described by static-dynamic quenching model derived from combination of Stern-Volmer and Perrin equation. The model was verified by time-resolved fluorescence measurements. Fluorescence lifetimes were calculated by averaging lifetime values for all concentrations of fullerene ranging from 0 to 5.2% with 0.28 ns for MDMO-PPV and 0.34 ns for Tg-PPV. The obtained exciton diffusion length from static-dynamic quenching and Förster distance calculated from spectral overlap between fluorescence spectra of polymer and absorption spectrum of donor could help to optimize the size of polymeric domains and morphology of interface for effective photogeneration.

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