Work Function Modification of Indium–Tin Oxide by Surface Plasma Treatments Using Different Gases

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概要

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• We report on the effects of surface treatment with N2, O2, and N2O plasmas on the work function of indium–tin oxide (ITO). UV photoelectron spectroscopy (UPS) showed that the work function on the ITO surface treated with N2O plasma increased more than that on the samples treated with N2 or O2 plasma. X-ray photoelectron spectroscopy (XPS) showed that the intensity of the O–O bonding peak at 532.3 eV markedly increased owing to the adsorption of O- ions on the ITO surface from breaking bonds in N2O gas by the plasma. The dipole layer formed by O- ions on the ITO surface increases the work function of ITO. Accordingly, N2O plasma treatment leads to a reduction of the potential barrier between the Fermi level of ITO and the highest occupied molecular orbital (HOMO) level of an organic layer when ITO is used as an anode for organic light-emitting devices (OLEDs) and related devices. Therefore, N2O plasma treatment enhances the hole-injection properties from the ITO thin film to the organic layer.

• 2009-02-25

著者

• Hwang Dae-Kue

  Department of Materials Science and Engineering, Gwangju Institute of Science and Technology, Gwangju 500-712, Korea

• Woo Sung-Ho

  Nano Applied Energy Device Laboratory, Daegu-Gyeongbuk Institute of Science and Technology, Daegu 704-230, Korea

• Kim Kang-Pil

  Nano Applied Energy Device Laboratory, Daegu-Gyeongbuk Institute of Science and Technology, Daegu 704-230, Korea

• Hussain A.

  Department of Materials Science and Engineering, Gwangju Institute of Science and Technology, Gwangju 500-712, Korea

• Lyu Hong-Keun

  Nano Applied Energy Device Laboratory, Daegu-Gyeongbuk Institute of Science and Technology, Daegu 704-230, Korea

• Baek Sung-Ho

  Nano Applied Energy Device Laboratory, Daegu-Gyeongbuk Institute of Science and Technology, Daegu 704-230, Korea

• Jang Youngman

  Department of Materials Science and Engineering, Gwangju Institute of Science and Technology, Gwangju 500-712, Korea

• Kim Jae-Hyun

  Nano Applied Energy Device Laboratory, Daegu-Gyeongbuk Institute of Science and Technology, Daegu 704-230, Korea

関連論文

• Efficiency Enhancement in Bulk Heterojunction Polymer Photovoltaic Cells Using ZrTiO4/Bi2O3 Metal-Oxide Nanocomposites
• Work Function Modification of Indium–Tin Oxide by Surface Plasma Treatments Using Different Gases
• Effect of Rapid Thermal Annealing on the Electrical Characteristics of ZnO Thin-Film Transistors

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