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Synchronous Polymerization of 3,4-Ethylenedioxythiophene and Pyrrole by Plasma Enhanced Chemical Vapor Deposition (PECVD) for Conductive Thin Film with Tunable Energy Bandgap

  • Sanghoon Kim
  • Joon Suk Oh
  • Taeseon Hwang
  • Hee Won Seo
  • Dong-Cheol Jeong
  • Jun-Ho Lee
  • Long Wen
  • Changsik Song
  • Jeon Geon Han
  • Jae-Do NamEmail author
Article
  • 5 Downloads

Abstract

Using a plasma enhanced chemical vapor deposition (PECVD) technique, a synchronous polymerization of 3,4-ethylenedioxythiophene (EDOT) and pyrrole monomers was investigated for the development of thin films with adjusted optoelectronic properties. Maintaining a constant amount of EDOT- and pyrrole-feed in the presence of a carrier gas, the PECVD reaction power was varied in the range of 10–100 W to give different physicochemical states of composite films composed of poly(3,4-ethylenedioxythiophene) (PEDOT) and polypyrrole (PPy). The deposition rate gradually increased with the reaction power reaching the highest deposition rate at 30 nm/min (100 W) in this study. The energy bandgap of the plasma-polymerized PEDOT/PPy copolymer films increased from 2.62 to 3.27 eV as the applied power density increased from 10 to 100 W in a continuous way, that could desirably ensure a tunable control of bandgaps in thin films. The electrical conductivity and the surface roughness of the thin films continuously increased from 1.59×10-4 to 2.28×10-2 S/m and from 0.2 to 1.9 nm respectively, as the applied power density decreased. The plasma-polymerized PEDOT/PPy copolymer is expected to find its application in various optoelectronic devices including the hole injection layer (HIL) in organic light-emitting diodes (OLEDs), and organic photovoltaics (OPVs) for the improved energy match.

Keywords

3,4-ethylenedioxythiophene pyrrole synchronous polymerization plasma power tunable bandgap 

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Copyright information

© The Polymer Society of Korea and Springer 2019

Authors and Affiliations

  • Sanghoon Kim
    • 1
  • Joon Suk Oh
    • 2
  • Taeseon Hwang
    • 3
  • Hee Won Seo
    • 4
  • Dong-Cheol Jeong
    • 5
    • 6
  • Jun-Ho Lee
    • 1
  • Long Wen
    • 7
    • 8
  • Changsik Song
    • 5
    • 6
  • Jeon Geon Han
    • 7
    • 8
  • Jae-Do Nam
    • 1
    • 4
    Email author
  1. 1.Department of Energy ScienceSungkyunkwan UniversitySuwonKorea
  2. 2.Center for Soft Matter Research, Department of PhysicsNew York UniversityNew YorkUnited States
  3. 3.Department of Mechanical EngineeringUniversity of Nevada, Las VegasLas VegasUnited States
  4. 4.School of Chemical Engineering, Department of Polymer Science and EngineeringSungkyunkwan UniversitySuwonKorea
  5. 5.Department of ChemistrySungkyunkwan UniversitySuwonKorea
  6. 6.Chemical and Biological Defense Research CenterSungkyunkwan UniversitySuwonKorea
  7. 7.NU-SKKU Joint Institute for Plasma-Nano MaterialsSungkyunkwan UniversitySuwonKorea
  8. 8.Center for Advanced Plasma Surface TechnologySungkyunkwan UniversitySuwonKorea

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