4 years ago

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

Evidence for Anisotropic Electronic Coupling of Charge Transfer States in Weakly Interacting Organic Semiconductor Mixtures
Wolfgang Brütting, Marc-Uwe Halbich, Paul Beyer, Andreas Opitz, Alexander Hinderhofer, Alexander V. Generalov, Marina Gerhard, Reinhard Scholz, Stefan Schmidt, Frank Schreiber, Martin Koch, Tino Meisel, Alexander Gerlach, Thomas Zechel, Theresa Linderl, Oleg Konovalov, Eduard Meister, Ana Sofia Anselmo, Valentina Belova
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.

Publisher URL: http://dx.doi.org/10.1021/jacs.7b01622

DOI: 10.1021/jacs.7b01622

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