Highly conductive poly(3,4-ethylenedioxythiophene) films by vapor phase polymerization for application in efficient organic light-emitting diodes

Peter A. Levermore, Lichun Chen, Xuhua Wang, Rupa Das, Donal D.C. Bradley

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118 Scopus citations

Abstract

The synthesis and optoelectronic properties of highly conductive poly(3,4-ethylenedioxythiophene) (PEDOT) films prepared by vapor phase polymerization (VPP) was reported. Patterned ITO-coated glass substrates were used for OLED fabrication, which were first cleaned, and then exposed to an oxygen plasma in an Emitech K1050X plasma asher, before a PEDOT-PSS hole-injection layer. The oxidants used were based on a 0.45 μm filtered solution comprising isopropanol (IPA) with Fe(OTs)3 and pyridine. After patterning a VPP PEDOT stripe on the substrates, plasma-oxygen treatment at a range of powers for 30s, a hole-injection layer of PEDOT-PSS was spin-coated on the top. Thin film conductivities were measured using a four-point-probe system with current-voltage data. VPP PEDOT composition alters as the film grows, and suggests that the energy barrier between VPP PEDOT layer could be minimized by the use of VPP PEDOT films.
Original languageEnglish (US)
JournalAdvanced Materials
Volume19
Issue number17
DOIs
StatePublished - Sep 3 2007
Externally publishedYes

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