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Electron Spin Echo of Photoinduced Spin-Correlated Polaron Pairs in P3HT:PCBM Composite

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Abstract

A variation of the electron spin echo (ESE) signal caused by laser pulse in a blend of [6,6]-phenyl C61 butyric acid methyl ester and poly(3-hexylthiophene) (P3HT:PCBM) was detected. This variation was attributed to light-generated paramagnetic species in P3HT:PCBM blend, with non-equilibrium spin polarization. The echo-detected electron paramagnetic resonance (EPR) spectrum of these species closely resembles the time-resolved EPR spectrum of spin-correlated polaron pair PCBM−/P3HT+ (Behrends et al. in Phys. Rev. B 85:125206, 2012) and was assigned to this pair. The characteristic times for polarization and coherence decay (9 ± 1 and 1.0 ± 0.2 μs, respectively) were measured for the PCBM−/P3HT+ pair at 77 K. These times are long enough, which shows the possibility of the application of the ESE technique for studying spin evolution of light-generated charge transfer intermediates in composites of fullerenes and conductive polymers.

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Acknowledgments

The article is dedicated to Prof. Hans-Martin Vieth on the occasion of his 70th birthday. The work was supported by the Russian Foundation for Basic Research grant no. 12-03-00238-a and the program of Presidium of the Russian Academy of Sciences no. 23/24.48 “Nanodynamics of disordered media” and the Federal target program “Scientific and scientific-pedagogical staff of innovative Russia” 2009–2013, SK No. 8175.

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  1. Institute of Chemical Kinetics and Combustion, Siberian Branch, Russian Academy of Sciences, Institutskaya 3, 630090, Novosibirsk, Russia

    Mikhail N. Uvarov & Leonid V. Kulik

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  1. Mikhail N. Uvarov
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  2. Leonid V. Kulik
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Correspondence to Leonid V. Kulik.

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Uvarov, M.N., Kulik, L.V. Electron Spin Echo of Photoinduced Spin-Correlated Polaron Pairs in P3HT:PCBM Composite. Appl Magn Reson 44, 97–106 (2013). https://doi.org/10.1007/s00723-012-0401-2

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  • DOI: https://doi.org/10.1007/s00723-012-0401-2

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