Influence of intermolecular vibrations on the electronic coupling in organic semiconductors: the case of anthracene and perfluoropentacene.
We have performed classical molecular dynamics simulations and quantum-chemical calculations on molecular crystals of anthracene and perfluoropentacene. Our goal is to characterize the amplitudes of the room-temperature molecular displacements and the corresponding thermal fluctuations in electronic transfer integrals, which constitute a key parameter for charge transport in organic semiconductors. Our calculations show that the thermal fluctuations lead to Gaussian-like distributions of the transfer integrals centered around the values obtained for the equilibrium crystal geometry. The calculated distributions have been plugged into Monte-Carlo simulations of hopping transport, which show that lattice vibrations impact charge transport properties to various degrees depending on the actual crystal structure.
Martinelli
Nicolas G
NG
Chemistry of Novel Materials, University of Mons, Place du Parc 20, 7000 Mons, Belgium.
Olivier
Yoann
Y
Athanasopoulos
Stavros
S
Ruiz Delgado
Mari-Carmen
MC
Pigg
Kathryn R
KR
da Silva Filho
Demétrio A
DA
Sánchez-Carrera
Roel S
RS
Venuti
Elisabetta
E
Della Valle
Raffaele G
RG
Brédas
Jean-Luc
JL
Beljonne
David
D
Cornil
Jérôme
J