Proceedings of the Korean Vacuum Society Conference (한국진공학회:학술대회논문집)

The Korean Vacuum Society (한국진공학회)
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Interfacial Electronic Structure of Bathocuproine and Al: Theoretical Study and Photoemission Spectroscopy

  • Lee, Jeihyun (Institute of Physics and Applied Physics, Yonsei University) ;
  • Kim, Hyein (Institute of Physics and Applied Physics, Yonsei University) ;
  • Shin, Dongguen (Institute of Physics and Applied Physics, Yonsei University) ;
  • Lee, Younjoo (Institute of Physics and Applied Physics, Yonsei University) ;
  • Park, Soohyung (Institute of Physics and Applied Physics, Yonsei University) ;
  • Yoo, Jisu (Institute of Physics and Applied Physics, Yonsei University) ;
  • Jeong, Junkyeong (Institute of Physics and Applied Physics, Yonsei University) ;
  • Hyun, Gyeongho (Institute of Physics and Applied Physics, Yonsei University) ;
  • Jeong, Kwangho (Institute of Physics and Applied Physics, Yonsei University) ;
  • Yi, Yeonjin (Institute of Physics and Applied Physics, Yonsei University)
  • Published : 2014.02.10
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Abstract

Interfacial electronic structure of bathocuproine and Al was investigated using in-situ photoemission spectroscopy and density functional theory (DFT) calculations. Bathocuproine is used for exciton blocking and electron transport material in organic photovoltaics and Al is typical cathode material. When thin thickness of Al was thermally evaporated on BCP, gap states were observed by ultraviolet photoemission spectroscopy. The closest gap state yielded below 0.3 eV from Fermi level. By x-ray photoemission spectroscopy, interaction of Al with nitrogen of BCP was observed. To understand the origin of gap states, DFT calculation was carried out and gap states was verified with successive calculation of interaction of Al and nitrogen of BCP. Furthermore, emergency of another state above Fermi level was observed. Remarkable reduction of electron injection barrier between Al and BCP, therefore, is possible.

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