Ultraviolet Photoemission Study of Interaction between Bathocuproine and Calcium

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概要

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• The electronic structure at the interface between bathocuproine (BCP) and calcium (Ca) was studied by ultraviolet photoemission spectroscopy (UPS) using two kinds of thin-films: Ca and BCP codeposited film, and BCP deposited on Ca. New peaks caused by the interaction of Ca with BCP were observed near the Fermi level. The energy position of the highest occupied molecular orbital (HOMO) of BCP measured from the Fermi level did not change with the thickness of BCP on Ca and the composition ratio of BCP to Ca. The new peaks related to the interface states shifted with the thickness of BCP on Ca and the composition ratio of BCP to Ca. It is suggested that the interface states are generated by the interaction of the Fermi level of Ca with the lowest unoccupied molecular orbital rather than the HOMO.

• 2008-02-25

著者

• 豊島 晋

  福島工業高等専門学校 電気工学科

• Akimoto Katsuhiro

  Institute Of Applied Physics University Of Tsukuba

• Saito Kazuhiro

  Research Center For Photovoltaics National Institute Of Advanced Industrial Science And Technology (

• Taima Tetsuya

  Research Center For Photovoltaics National Institute Of Advanced Industrial Science And Technology (

• Toyoshima Susumu

  Graduate School Of Pure And Applied Sciences Tsukuba University

• Kato Hiroo

  Department Of Electronic And Information System Engineering Faculty Of Science And Technology Hirosa

• Sakurai Takeaki

  Institute Of Applied Physics University Of Tsukuba

• Toyoshima Susumu

  Institute of Applied Physics, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8573, Japan

• Kato Hiroo

  Department of Advanced Physics, Faculty of Science and Technology, Hirosaki University, 3 Bunkyo-cho, Hirosaki, Aomori 036-8561, Japan

• Akimoto Katsuhiro

  Institute of Applied Physics, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8573, Japan

• Sakurai Takeaki

  Institute of Applied Physics, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8573, Japan

• Taima Tetsuya

  Research Center for Photovoltaics, National Institute of Advanced Industrial Science and Technology (AIST), AIST Tsukuba Central 2, 1-1-1 Umezono, Tsukuba, Ibaraki 305-8568, Japan

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