The gas-phase electron affinity (EA) of phenyl-C61-butyric acid methyl ester (PCBM), one of the best-performing electron acceptors in organic photovoltaic devices, was measured by low-temperature photoelectron spectroscopy for the first time. The obtained value of 2.63(1) eV is only ca. 0.05 eV lower than that of C60 (2.683(8) eV), compared to a 0.09 V difference in their E1/2 values measured in this work by cyclic voltammetry. Literature E(LUMO) values for PCBM that are typically estimated from cyclic voltammetry and commonly used as a quantitative measure of acceptor properties are dispersed over a wide range between -4.38 and -3.62 eV; the reasons for such a huge discrepancy are analyzed here, and a protocol for reliable and consistent estimations of relative fullerene-based acceptor strength in solution is proposed. © 2013 American Chemical Society.
CITATION STYLE
Larson, B. W., Whitaker, J. B., Wang, X. B., Popov, A. A., Rumbles, G., Kopidakis, N., … Boltalina, O. V. (2013). Electron affinity of Phenyl-C61-butyric acid methyl ester (PCBM). Journal of Physical Chemistry C, 117(29), 14958–14964. https://doi.org/10.1021/jp403312g
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