title: Highest-occupied-molecular-orbital band dispersion of rubrene single crystals as observed by angle-resolved ultraviolet photoelectron spectroscopy.
abstract: The electronic structure of rubrene single crystals was studied by angle-resolved ultraviolet photoelectron spectroscopy. A clear energy dispersion of the highest occupied molecular orbital-derived band was observed, and the dispersion width was found to be 0.4 eV along the well-stacked direction. The effective mass of the holes was estimated to be 0.65(+/-0.1)m0. The present results suggest that the carrier conduction mechanism in rubrene single crystals can be described within the framework of band transport.
authors.affiliation: Graduate School of Advanced Integration Science, Chiba University, Chiba 263-8522, Japan.
authors.forename: Shin-ichi
authors.initials: S
authors.lastname: Machida
authors.forename: Yasuo
authors.initials: Y
authors.lastname: Nakayama
authors.forename: Steffen
authors.initials: S
authors.lastname: Duhm
authors.forename: Qian
authors.initials: Q
authors.lastname: Xin
authors.forename: Akihiro
authors.initials: A
authors.lastname: Funakoshi
authors.forename: Naoki
authors.initials: N
authors.lastname: Ogawa
authors.forename: Satoshi
authors.initials: S
authors.lastname: Kera
authors.forename: Nobuo
authors.initials: N
authors.lastname: Ueno
authors.forename: Hisao
authors.initials: H
authors.lastname: Ishii