title: Vibronic coupling in organic semiconductors: the case of fused polycyclic benzene-thiophene structures.
abstract: The nature of vibronic coupling in fused polycyclic benzene-thiophene structures has been studied using an approach that combines high-resolution gas-phase photoelectron spectroscopy measurements with first-principles quantum-mechanical calculations. The results indicate that in general the electron-vibrational coupling is stronger than the hole-vibrational coupling. In acenedithiophenes, the main contributions to the hole-vibrational coupling arise from medium- and high-frequency vibrations. In thienobisbenzothiophenes, however, the interaction of holes with low-frequency vibrations becomes significant and is larger than the corresponding electron-vibrational interaction. This finding is in striking contrast with the characteristic pattern in oligoacenes and acenedithiophenes in which the low-frequency vibrations contribute substantially only to the electron-vibrational coupling. The impact of isomerism has been studied as well.
authors.affiliation: School of Chemistry and Biochemistry, Georgia Institute of Technology, Atlanta, Georgia 30332-0400, USA. veaceslav.coropceanu@chemistry.gatech.edu
authors.forename: Veaceslav
authors.initials: V
authors.lastname: Coropceanu
authors.forename: Ohyun
authors.initials: O
authors.lastname: Kwon
authors.forename: Brigitte
authors.initials: B
authors.lastname: Wex
authors.forename: Bilal R
authors.initials: BR
authors.lastname: Kaafarani
authors.forename: Nadine E
authors.initials: NE
authors.lastname: Gruhn
authors.forename: Jason C
authors.initials: JC
authors.lastname: Durivage
authors.forename: Douglas C
authors.initials: DC
authors.lastname: Neckers
authors.forename: Jean-Luc
authors.initials: JL
authors.lastname: Brédas