Characterizing the Polymer:Fullerene Intermolecular Interactions

Sean Sweetnam, Koen Vandewal, Eunkyung Cho, Chad Risko, Veaceslav Coropceanu, Alberto Salleo, Jean-Luc Bredas, Michael D. McGehee

Research output: Contribution to journalArticlepeer-review

19 Scopus citations

Abstract

Polymer:fullerene solar cells depend heavily on the electronic coupling of the polymer and fullerene molecular species from which they are composed. The intermolecular interaction between the polymer and fullerene tends to be strong in efficient photovoltaic systems, as evidenced by efficient charge transfer processes and by large changes in the energetics of the polymer and fullerene when they are molecularly mixed. Despite the clear presence of these strong intermolecular interactions between the polymer and fullerene, there is not a consensus on the nature of these interactions. In this work, we use a combination of Raman spectroscopy, charge transfer state absorption, and density functional theory calculations to show that the intermolecular interactions do not appear to be caused by ground state charge transfer between the polymer and fullerene. We conclude that these intermolecular interactions are primarily van der Waals in nature. © 2016 American Chemical Society.
Original languageEnglish (US)
Pages (from-to)1446-1452
Number of pages7
JournalChemistry of Materials
Volume28
Issue number5
DOIs
StatePublished - Feb 12 2016

Bibliographical note

KAUST Repository Item: Exported on 2020-10-01
Acknowledgements: This work was supported by the Department of the Navy, Office of Naval Research Award N00014-14-1-0580, and by ONR Global, Grant N62909-15-1-2003. S.S. acknowledges support from the National Science Foundation through the National Science Foundation Graduate Research Fellowship under Grant DGE-114747, and support from Stanford University through a Benchmark Stanford Graduate Fellowship.

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