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

Belova, Valentina; Beyer, Paul; Meister, Eduard; Linderl, Theresa; Halbich, Marc Uwe; Gerhard, Marina LU ; Schmidt, Stefan; Zechel, Thomas; Meisel, Tino and Generalov, Alexander V. LU , et al. (2017) In Journal of the American Chemical Society 139(25). p.8474-8486
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... (More)

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.

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publication status
published
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Journal of the American Chemical Society
volume
139
issue
25
pages
13 pages
publisher
The American Chemical Society
external identifiers
  • scopus:85021656645
  • wos:000404809600022
ISSN
0002-7863
DOI
10.1021/jacs.7b01622
language
English
LU publication?
yes
id
fba44668-7bad-4620-8c44-010b8318c24d
date added to LUP
2017-07-19 08:18:18
date last changed
2017-09-18 11:38:38
@article{fba44668-7bad-4620-8c44-010b8318c24d,
  abstract     = {<p>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-CN<sub>2</sub>) 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.</p>},
  author       = {Belova, Valentina and Beyer, Paul and Meister, Eduard and Linderl, Theresa and Halbich, Marc Uwe and Gerhard, Marina and Schmidt, Stefan and Zechel, Thomas and Meisel, Tino and Generalov, Alexander V. and Anselmo, Ana Sofia and Scholz, Reinhard and Konovalov, Oleg and Gerlach, Alexander and Koch, Martin and Hinderhofer, Alexander and Opitz, Andreas and Brütting, Wolfgang and Schreiber, Frank},
  issn         = {0002-7863},
  language     = {eng},
  month        = {06},
  number       = {25},
  pages        = {8474--8486},
  publisher    = {The American Chemical Society},
  series       = {Journal of the American Chemical Society},
  title        = {Evidence for Anisotropic Electronic Coupling of Charge Transfer States in Weakly Interacting Organic Semiconductor Mixtures},
  url          = {http://dx.doi.org/10.1021/jacs.7b01622},
  volume       = {139},
  year         = {2017},
}