Electron affinity of Phenyl-C61-butyric acid methyl ester (PCBM)

  • Larson B
  • Whitaker J
  • Wang X
 et al. 
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The gas-phase electron affinity (EA) of phenyl-C-61-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 C-60 (2.683(8) eV), compared to a 0.09 V difference in their E-1/2 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.

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  • Bryon W. Larson

  • James B. Whitaker

  • Alexey A. Popov

  • Garry Rumbles

  • Nikos Kopidakis

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