Evidence for Anisotropic Electronic Coupling of Charge Transfer States in Weakly Interacting Organic Semiconductor Mixtures

Valentina Belova, Paul Beyer, Eduard Meister, Theresa Linderl, Marc Uwe Halbich, Marina Gerhard, Stefan Schmidt, Thomas Zechel, Tino Meisel, Alexander V. Generalov, Ana Sofia Anselmo, Reinhard Scholz, Oleg Konovalov, Alexander Gerlach, Martin Koch, Alexander Hinderhofer, Andreas Opitz, Wolfgang Brütting, Frank Schreiber

Research output: Contribution to journalArticlepeer-review

31 Citations (SciVal)

Abstract

We present a comprehensive investigation of the charge-transfer (CT) effect in weakly interacting organic semiconductor mixtures. The donor-acceptor pair diindenoperylene (DIP) and N,N′-bis(2-ethylhexyl)-1,7-dicyanoperylene-3,4/9,10-bis(dicarboxyimide) (PDIR-CN2) has been chosen as a model system. A wide range of experimental methods was used in order to characterize the structural, optical, electronic, and device properties of the intermolecular interactions. By detailed analysis, we demonstrate that the partial CT in this weakly interacting mixture does not have a strong effect on the ground state and does not generate a hybrid orbital. We also find a strong CT transition in light absorption as well as in photo- and electroluminescence. By using different layer sequences and compositions, we are able to distinguish electronic coupling in-plane vs out-of-plane and, thus, characterize the anisotropy of the CT state. Finally, we discuss the impact of CT exciton generation on charge-carrier transport and on the efficiency of photovoltaic devices.

Original languageEnglish
Pages (from-to)8474-8486
Number of pages13
JournalJournal of the American Chemical Society
Volume139
Issue number25
DOIs
Publication statusPublished - 2017 Jun 28

Subject classification (UKÄ)

  • Physical Chemistry

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