title: Molecular-scale investigation of C60/p-sexiphenyl organic heterojunction interface.
abstract: In situ low-temperature scanning tunneling microscopy (LT-STM) and ultraviolet photoelectron spectroscopy (UPS) experiments have been carried out to investigate the interface properties at the C(60)∕p-sexiphenyl (6P) organic-organic heterojunction interface, including the interfacial energy level alignment and the supramolecular packing structures. As revealed by UPS measurements, the vacuum level is almost aligned at the C(60)∕6P interface, suggesting that the interface is dominated by weak intermolecular interactions, such as van der Waals and π-π interactions. In situ LT-STM experiments also indicate the formation of a molecularly sharp C(60)∕6P interface with hexagonally-close-packed C(60) layers nucleated atop 6P layer on graphite.
authors.affiliation: Department of Physics, National University of Singapore, Singapore.
authors.forename: Jian Qiang
authors.initials: JQ
authors.lastname: Zhong
authors.forename: Han
authors.initials: H
authors.lastname: Huang
authors.forename: Hong Ying
authors.initials: HY
authors.lastname: Mao
authors.forename: Rui
authors.initials: R
authors.lastname: Wang
authors.forename: Shu
authors.initials: S
authors.lastname: Zhong
authors.forename: Wei
authors.initials: W
authors.lastname: Chen