Charge-Transfer Dynamics in the Lowest Excited State of a Pentacene–Fullerene Complex: Implications for Organic Solar Cells

Saju Joseph, Mahesh Kumar Ravva, Jean-Luc Bredas

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29 Scopus citations

Abstract

We characterize the dynamic nature of the lowest excited state in a pentacene/C60 complex on the femtosecond time scale, via a combination of ab initio molecular dynamics and time-dependent density functional theory. We analyze the correlations between the molecular vibrations of the complex and the oscillations in the electron-transfer character of its lowest excited state, which point to vibration-induced coherences between the (pentacene-based) local-excitation (LE) state and the complex charge-transfer (CT) state. We discuss the implications of our results on this model system for the exciton-dissociation process in organic solar cells.
Original languageEnglish (US)
Pages (from-to)5171-5176
Number of pages6
JournalThe Journal of Physical Chemistry Letters
Volume8
Issue number20
DOIs
StatePublished - Oct 9 2017

Bibliographical note

KAUST Repository Item: Exported on 2020-10-01
Acknowledgements: We thank Dr. Greg Scholes, Dr. Sean Ryno, and Dr. Simil Thomas for insightful discussions. This work has been supported by King Abdullah University of Science and Technology (KAUST), the KAUST Competitive Research Grant program, and the Office of Naval Research (Award No. N00014-17-1-2208). We acknowledge the IT Research Computing Team and Supercomputing Laboratory at KAUST for providing computational and storage resources.

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