A photophysical study of PCBM thin films

Steffan Cook, Hideo Ohkita, Youngkyoo Kim, Jessica J. Benson-Smith, Donal D.C. Bradley, James R. Durrant

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145 Scopus citations

Abstract

The photophysical properties of [6,6]-phenyl C61 butyric acid methyl ester (PCBM) are found to differ depending on its concentration in thin films. A film of dispersed PCBM molecules in polystyrene (PS) showed only weak absorption in the visible region (400-700 nm) with a single S1 → S0 emission band at around 700 nm. By comparison, a film of pristine PCBM showed heightened absorption in the visible region and the presence of an additional higher energy emission at ∼500 nm assigned to the presence of charge transfer (CT) transitions in crystalline PCBM. The energy of the CT exciton is estimated to be ∼2.8 eV. © 2007 Elsevier B.V. All rights reserved.
Original languageEnglish (US)
JournalChemical Physics Letters
Volume445
Issue number4-6
DOIs
StatePublished - Sep 13 2007
Externally publishedYes

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