title: Exciton band structure of pentacene molecular solids: breakdown of the Frenkel exciton model.
abstract: Employing inelastic electron scattering we demonstrate here the determination of the exciton dispersion in a molecular solid. The failure of the applied tight-binding description provides strong evidence for a necessary reconsideration of the traditional, Frenkel-exciton based, understanding of the lowest-lying electronic transitions in organic semiconductors.
authors.affiliation: IFW Dresden, Postfach 270116, D-01171 Dresden, Germany.
authors.forename: R
authors.initials: R
authors.lastname: Schuster
authors.forename: M
authors.initials: M
authors.lastname: Knupfer
authors.forename: H
authors.initials: H
authors.lastname: Berger