A photophysical study of PCBM thin films

By S. Cook, Hideo Ohkita, Youngkyoo Kim, Jessica J. Benson-Smith, D. Bradley, J. Durrant. 2007

169 citations recorded by the source corpus.

Abstract The photophysical properties of [6,6]-phenyl C 61 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 S 1  → S 0 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.

Subfields: Electrical and Electronic Engineering, Polymers and Plastics

View Paper: https://www.semanticscholar.org/paper/5d6146753e5c13686583a928a8a8afdfe23def7e