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Effect of Solvent Doping and Post-Treatment on the Characteristics of PEDOT : PSS Conducting Polymer

솔벤트 도핑과 후처리 공정에 따른 전도성 고분자 PEDOT : PSS의 특성 변화

  • Kim, Jin Hee (Department of Display Engineering, Pukyong National University) ;
  • Seo, Yoon Kyung (Department of Display Engineering, Pukyong National University) ;
  • Han, Joo Won (Department of Display Engineering, Pukyong National University) ;
  • Oh, Ji Yoon (Department of Display Engineering, Pukyong National University) ;
  • Kim, Yong Hyun (Department of Display Engineering, Pukyong National University)
  • 김진희 (부경대학교 융합디스플레이공학과) ;
  • 서윤경 (부경대학교 융합디스플레이공학과) ;
  • 한주원 (부경대학교 융합디스플레이공학과) ;
  • 오지윤 (부경대학교 융합디스플레이공학과) ;
  • 김용현 (부경대학교 융합디스플레이공학과)
  • Received : 2015.02.06
  • Accepted : 2015.03.26
  • Published : 2015.06.10

Abstract

Poly(3,4-ethylenedioxythiophene) : poly(styrenesulfonate) (PEDOT : PSS) has attracted a great deal of attention as a transparent conductive material for organic solar cells or organic light-emitting diodes due to its high electrical conductivity, optical transparency, and excellent mechanical flexibility. It is well known that a solvent doping for PEDOT : PSS thin-films significantly increases the conductivity of films. In this paper, the effect of various kinds of solvent doping and post-treatment on the electrical and structural properties of PEDOT : PSS thin-films is investigated. The solvent doping greatly increases the conductivity of PEDOT : PSS thin-films up to 884 S/cm. A further enhancement of the conductivity of PEDOT : PSS thin-films is achieved by the solvent post-treatment which raises the conductivity up to 1131 S/cm. The enhancement is mainly caused by the depletion of insulating PSS and forming conducting PEDOT-rich granular networks. Strong optical absorption peaks at the wavelength of 225 nm of PEDOT : PSS thin-films indicate the depletion of insulating PSS by post-treatment. We believe that the solvent post-treatment is a promising method to achieve highly conductive transparent PEDOT : PSS thin-films for applications in efficient, low-cost and flexible organic devices.

Keywords

PEDOT : PSS;conducting polymer;organic semiconductor;transparent conducting material

Acknowledgement

Supported by : 부경대학교

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