Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference (한국전기전자재료학회:학술대회논문집)

The Korean Institute of Electrical and Electronic Material Engineers (한국전기전자재료학회)
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Impedance spectroscopy analysis of organic light emitting diodes with the $O_2$ anode plasma treatment

저압 산소 플라즈마 처리된 ITO박막을 이용한 유기 EL 소자의 성능 향상에 관한 임피던스 분석

  • Kim, Hyun-Min (School of Information and Communication Engineering, Sungkyunkwan Univ.) ;
  • Park, Hyung-June (School of Information and Communication Engineering, Sungkyunkwan Univ.) ;
  • Lee, Jun-Sin (School of Information and Communication Engineering, Sungkyunkwan Univ.) ;
  • Oh, Se-Myoung (Dept. of physics, Sungkyunkwan Univ.) ;
  • Jung, Dong-Ggeun (Dept. of physics, Sungkyunkwan Univ.)
  • 김현민 (성균관대학교 전자전기공학과) ;
  • 박형준 (성균관대학교 전자전기공학과) ;
  • 이준신 (성균관대학교 전자전기공학과) ;
  • 오세명 (성균관대학교 물리학과) ;
  • 정동근 (성균관대학교 물리학과)
  • Published : 2006.06.22
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Abstract

In this work, impedance Spectroscopic analysis was applied to study the effect of plasma treatment on the surface of indum-tin oxide (ITO) anodes using $O_2$ gas and to model the equivalent circuit for organic light emitting diodes (OLEDs) with the $O_2$ plasma treatment of ITO surface at the anodes. This device with ITO/TPD/Alq3/LiF/Al structure can be modeled as a simple combination of a resistor and a capacitor. The $O_2$ plasma treatment on the surface of ITO shifts the vacuum level of the ITO as a result of which the barrier height for hole injection at the ITO/organic interface is reduced. The impedance spectroscopy measurement of the devices with the $O_2$ plasma treatment on the surface of ITO anodes shows change of values in parallel resistance ($R_p$) and parallel capacitance ($C_p$).

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