title: Formation of solid-state excitons in ultrathin crystalline films of PTCDA: from single molecules to molecular stacks.
authors.affiliation: Institut für Angewandte Photophysik, Technische Universität Dresden, D-01062 Dresden, Germany.
authors.forename: Holger
authors.initials: H
authors.lastname: Proehl
authors.forename: Thomas
authors.initials: T
authors.lastname: Dienel
authors.forename: Robert
authors.initials: R
authors.lastname: Nitsche
authors.forename: Torsten
authors.initials: T
authors.lastname: Fritz