Bipolar polaron pair recombination in polymer/fullerene solar cells

Alexander J. Kupijai, Konstantin M. Behringer, Florian G. Schaeble, Natalie E. Galfe, Michael Corazza, Suren A. Gevorgyan, Frederik C Krebs, Martin Stutzmann, Martin S. Brandt

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We present a study of the rate-limiting spin-dependent charge-transfer processes in different polymer/fullerene bulk-heterojunction solar cells at 10 K. Observing central spin-locking signals in pulsed electrically detected magnetic resonance and an inversion of Rabi oscillations in multifrequency electron-double-resonance spectroscopy, we find that the spin response of both spin-coated and printed P3HT/PCBM and spin-coated PCDTBT/PCBM solar cells at low temperatures is governed by bipolar polaron pair recombination and quantitatively determine the polaron-polaron coupling strength with double electron-electron resonance experiments. Furthermore spin Hahn echo decay and inversion recovery measurements are performed to measure spin coherence and recombination times of the polaron pairs, respectively.
Original languageEnglish
Article number245203
JournalPhysical Review B
Issue number24
Number of pages8
Publication statusPublished - 2015


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