Electronic Structure of Bathocuproine on Metal Studied by Ultraviolet Photoemission Spectroscopy
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概要
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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.
- 2007-04-30
著者
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Akimoto Katsuhiro
Institute Of Applied Physics University Of Tsukuba
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Saito Kazuhiro
Research Center For Photovoltaics National Institute Of Advanced Industrial Science And Technology (
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Taima Tetsuya
Research Center For Photovoltaics National Institute Of Advanced Industrial Science And Technology (
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Sakurai Takeaki
Institute Of Applied Physics University Of Tsukuba
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Kuwabara Kazuhisa
Institute of Applied Physics, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8573, Japan
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Toyoshima Susumu
Institute of Applied Physics, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8573, Japan
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Kato Hiroo
Department of Advanced Physics, Faculty of Science and Technology, Hirosaki University, 3 Bunkyo-cho, Hirosaki, Aomori 036-8561, Japan
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