Preprint article ยท Journal article
Bipolar polaron pair recombination in polymer/fullerene solar cells
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.
Language: | English |
---|---|
Year: | 2015 |
ISSN: | 1550235x , 10980121 and 01631829 |
Types: | Preprint article and Journal article |
DOI: | 10.1103/physrevb.92.245203 |
ORCIDs: | Gevorgyan, Suren A. and Krebs, Frederik C |