Deposition of PEDOT: PSS Nanoparticles as a Conductive Microlayer Anode in OLEDs Device by Desktop Inkjet Printer

S Ummartyotin,M Sain,J Juntaro,C Wu,H Manuspiya

doi:10.1155/2011/606714

S Ummartyotin, M Sain + Show 3 more

Open Access

https://doi.org/10.1155/2011/606714

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Abstract

A simple microfabrication technique for delivering macromolecules and patterning microelectrode arrays using desktop inkjet printer was described. Aqueous solution of nanoparticle of poly (3,4-ethylenedioxythiophene) (PEDOT) doped with polystyrene sulfonic acid (PSS) was prepared while its particle size, the surface tension, and the viscosity of the solution were adjusted to be suitable for deposition on a flexible cellulose nanocomposite substrate via inkjet printer. The statistical average of PEDOT: PSS particle size of 100 nm was observed. The microthickness, surface morphology, and electrical conductivity of the printed substrate were then characterized by profilometer, atomic force microscope (AFM), and four-point probe electrical measurement, respectively. The inkjet deposition of PEDOT: PSS was successfully carried out, whilst retained its transparency feature. Highly smooth surface (roughness ~23–44 nm) was achieved.

Highlights

Reliable, low cost and optimized properties are fundamental prerequisites for researches in advanced surface coating and technology
Nanoscale size of PEDOT: polystyrene sulfonic acid (PSS) particle in aqueous solution was observed by transmission electron microscopy (TEM)
The particle size is in the range of ∼100–200 nm as the nozzle size of cartridge printhead is 200 nm in diameter [24]

Summary

Introduction

Low cost and optimized properties are fundamental prerequisites for researches in advanced surface coating and technology. Inkjet printing [8,9,10,11,12,13] is a commonly used deposition technique for direct patterning or row-column pixel assemblies It is rapid and simple, with lower operating cost than any vapor deposition technique. Several literatures propose conductive inks dedicated to inkjet printing process by using conductive polymer such as PEDOT: PSS (poly (3,4-ethylenedioxythiophene) poly(styrenesulfonate)) [17, 18]. This conductive polymer is commonly used in optoelectronic device due to its solution processability, high transparency in the visible wavelength, and excellent thermal stability. Conductive patterns were printed using a PEDOT: PSS solution modified with organic solvent for electrical conductivity enhancement

Experimental

Physical Chemistry of PEDOT

Conclusion