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Gap state formation by interfacial interaction between Al and 8-hydroxyquinolatolithium.

Yeonjin Yi1, Young Mi Lee, Yongsup Park

  • 1Division of Industrial Metrology, Korea Research Institute of Standards and Science, 209 Gajeong-Ro, Yuseong-Gu, Daejeon 305-340, South Korea. yeonjin@kriss.re.kr

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Hydroxyquinolatolithium (Liq) forms a Liq-Al complex with aluminum, donating electrons to create a new gap state. This interaction, unlike its inorganic counterpart, enables intermediate-state assisted carrier transport in Liq layers.

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Area of Science:

  • Materials Science
  • Surface Science
  • Organic Electronics

Background:

  • Understanding interfacial interactions is crucial for developing advanced electronic devices.
  • Hydroxyquinolatolithium (Liq) is a material of interest for its charge control properties.
  • Previous studies on similar materials like Al-LiF-Alq(3) showed different interfacial behaviors.

Purpose of the Study:

  • To investigate the interfacial interaction between hydroxyquinolatolithium (Liq) and aluminum (Al).
  • To elucidate the mechanism of charge transfer and its effect on Liq's electronic properties.
  • To explain the charge control capabilities of Liq layers based on interfacial phenomena.

Main Methods:

  • In situ synchrotron radiation photoemission (SRP) spectroscopy was employed to study the interface.
  • Stepwise deposition of aluminum onto a pristine Liq molecular layer.
  • Density functional theory (DFT) calculations were used to model and analyze the SRP results.

Main Results:

  • Liq does not decompose into Li(+) ions upon interaction with Al.
  • A Liq-Al complex is formed, characterized by charge donation from Al to Liq.
  • Electrons from Al occupy the LUMO level of Liq, creating a new gap state.

Conclusions:

  • The interfacial interaction between Liq and Al involves complex formation and charge donation, not decomposition.
  • The newly formed gap state in Liq is key to understanding its charge control properties.
  • This gap state facilitates intermediate-state assisted carrier transport, explaining the observed electronic behavior.