TY - JOUR
T1 - Evidence for Anisotropic Electronic Coupling of Charge Transfer States in Weakly Interacting Organic Semiconductor Mixtures
AU - Belova, Valentina
AU - Beyer, Paul
AU - Meister, Eduard
AU - Linderl, Theresa
AU - Halbich, Marc Uwe
AU - Gerhard, Marina
AU - Schmidt, Stefan
AU - Zechel, Thomas
AU - Meisel, Tino
AU - Generalov, Alexander V.
AU - Anselmo, Ana Sofia
AU - Scholz, Reinhard
AU - Konovalov, Oleg
AU - Gerlach, Alexander
AU - Koch, Martin
AU - Hinderhofer, Alexander
AU - Opitz, Andreas
AU - Brütting, Wolfgang
AU - Schreiber, Frank
PY - 2017/6/28
Y1 - 2017/6/28
N2 - 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.
AB - 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.
U2 - 10.1021/jacs.7b01622
DO - 10.1021/jacs.7b01622
M3 - Article
C2 - 28570061
AN - SCOPUS:85021656645
SN - 0002-7863
VL - 139
SP - 8474
EP - 8486
JO - Journal of the American Chemical Society
JF - Journal of the American Chemical Society
IS - 25
ER -
