title: Molecular alignment and energy-level diagram at heteromolecular interface of quaterrylene and terrylene-3,4,11,12-tetracarboximide.
abstract: Heteromolecular layers consisting of quaterrylene (QT) and terrylene-3,4,11,12-tetracarboximide (TTCDI-C12) were prepared on SiO2 surfaces and the electronic energy level alignment at TTCDI-C12/QT interface was examined. TTCDI-C12 layers were grown in nearly perpendicular orientation on QT layers by an ultraslow deposition technique, thereby achieving formation of a well-defined TTCDI-C12/QT interface. Atomic force microscopy (AFM) measurements ensured excellent surface flatness of each layer, surface roughnesses of which were comparable to that of pristine SiO2. Energy level alignment at the heteromolecular interface was evaluated by using ultraviolet photoelectron spectroscopy (UPS) and optical absorption measurements. No shift in energy level was served at the heteromolecular interface, indicating that charge transfer does not occur and a dipole moment is not formed at the well-defined TTCDI-C12/QT interface.
authors.affiliation: Advanced Electronic Materials Center, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan.
authors.forename: Nobuya
authors.initials: N
authors.lastname: Hiroshiba
authors.forename: Jonathan P
authors.initials: JP
authors.lastname: Hill
authors.forename: Ryoma
authors.initials: R
authors.lastname: Hayakawa
authors.forename: Toyohiro
authors.initials: T
authors.lastname: Chikyow
authors.forename: Kiyoto
authors.initials: K
authors.lastname: Matsuishi
authors.forename: Katsuhiko
authors.initials: K
authors.lastname: Ariga
authors.forename: Yutaka
authors.initials: Y
authors.lastname: Wakayama