1. Bipolar polaron pair recombination in polymer/fullerene solar cells.
- Author
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Kupijai, Alexander J., Behringer, Konstantin M., Schaeble, Florian G., Galfe, Natalie E., Corazza, Michael, Gevorgyan, Suren A., Krebs, Frederik C., Stutzmann, Martin, and Brandt, Martin S.
- Subjects
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POLARONS , *FULLERENES , *SOLAR cells , *CHARGE transfer , *STRENGTH of materials - Abstract
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. [ABSTRACT FROM AUTHOR]
- Published
- 2015
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