Low-temperature scanning tunneling microscopy/ultraviolet photoelectron spectroscopy investigation of two-dimensional crystallization of C 60 : pentacence binary system on Ag(111)

• Published in: Journal of applied physics 2012-02, Vol.111 (3), p.034304-034304-6
• Main Authors: Lin Zhang, Jia, Hong Liang Zhang, Kelvin, Qiang Zhong, Jian, Chao Niu, Tian, Chen, Wei
• Format: Article
• Language: English
• ISSN: 0021-8979; 1089-7550
• DOI: 10.1063/1.3679573

Atomic scale investigation of temperature-dependent two-dimensional (2 D) crystallization processes of fullerene-C 60 on pentacene-covered Ag(111) surface has been carried out by in situ low-temperature scanning tunneling microscopy (LT-STM) experiments. To evaluate the effect of molecule-substrate interfacial interactions on the 2 D crystallization of C 60 : pentacene binary system, we also carried out the same self-assembly experiments of C 60 on monolayer pentacene covered graphite substrate. It is revealed that temperature-dependent structural transition of various ordered C 60 nanoassemblies is strongly influenced by the molecule-Ag(111) interfacial interactions, and further mediated by the weak C 60 -pentacene intermolecular interactions. In situ ultraviolet photoelectron spectroscopy (UPS) has been used to evaluate the nature of the intermolecular interactions between C 60 and pentacene films.