期刊
MACROMOLECULAR RESEARCH
卷 27, 期 3, 页码 243-249出版社
POLYMER SOC KOREA
DOI: 10.1007/s13233-019-7045-0
关键词
3; 4-ethylenedioxythiophene; pyrrole; synchronous polymerization; plasma power; tunable bandgap
资金
- National Research Foundation of Korea (NRF)
- Ministry of Science, ICT & Future Planning [NRF-2014M3C1B2048175, 2016R1A2B1007134, NRF-2017R1A2B4006091]
- Ministry of Trade, Industry and Energy (MOTIE) [10067690, 10080545]
- Ministry of Trade, Industry and Energy (MOTIE) (KIAT) [N0002476]
- Korea Evaluation Institute of Industrial Technology (KEIT) [10080545, N0002476, 10067690] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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 1.59x10(-4) to 2.28x10(-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.
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