Molecular-scale investigation of C-60/p-sexiphenyl organic heterojunction interface

作者：Zhong Jian Qiang; Huang Han; Mao Hong Ying; Wang Rui; Zhong Shu; Chen Wei^*

来源：Journal of Chemical Physics, 2011, 134(15): 154706.

DOI：10.1063/1.3582789

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 pi-pi 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.

• 出版日期2011-4-21