S. Toyoshima, Kazuhisa Kuwabara, T. Sakurai
Sep 13, 2006
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Journal
Japanese Journal of Applied Physics
Abstract
The electronic structure at the interface between bathocuproine (BCP) and a metal was studied by ultraviolet photoemission spectroscopy (UPS). For Ag, Al, Mg, and Ca, interface states were observed near the Fermi level. On the other hand, no interface states were observed for Au. The intensities of the interface states increase with decreasing metal work function. It is suggested that the interface states play an important role in electron transport at the interface. It was found that the energy difference between the BCP vacuum level and the metal Fermi level is almost constant. This phenomenon is similar to the Schottky barrier pinning observed at a metal/semiconductor interface. The cause of this phenomenon is discussed.