Fabrication of novel two-dimensional nanopatterned conductive PEDOT:PSS films for organic optoelectronic applications

TitleFabrication of novel two-dimensional nanopatterned conductive PEDOT:PSS films for organic optoelectronic applications
Publication TypeArticolo su Rivista peer-reviewed
Year of Publication2013
AuthorsPetti, L., Rippa M., Capasso R., Nenna G., De Girolamo Del Mauro Anna, Pandolfi G., Maglione Maria Grazia, and Minarini Carla
JournalACS Applied Materials and Interfaces
Keywords4-ethylenedioxythiophene), Band structure, Conducting polymers, Conductive films, Efficiency, Electrodes, electron beam lithography, Finite difference time domain method, Finite difference time domains, flexible OLED, Light emitting diodes, Light extraction, Natural frequencies, Photonic band structures, Photonic crystals, Plane wave expansion method, Plasma applications, Plasma etching, Poly(3, Polyethylene terephthalates, Polyethylene terephthalates (PET), Scanning electron microscopy, Two dimensional, Two-dimensional photonic crystals

This paper presents a novel strategy to fabricate two-dimensional poly(3,4 ethylenedioxythiophene):poly(styrene sulfonate) (PEDOT:PSS) photonic crystals (PCs) combining electron beam lithography (EBL) and plasma etching (PE) processes. The surface morphology of PEDOT:PSS PCs after mild oxygen plasma treatment was investigated by scanning electron microscopy. The effects on light extraction are studied experimentally. Vertical extraction of light was found to be strongly dependent on the geometric parameters of the PCs. By changing the lattice type from triangular to square and the geometrical parameters of the photonic structures, the resonance peak could be tuned from a narrow blue emission at 445 nm up to a green emission at 525 nm with a full width at half-maximum of 20 nm, which is in good agreement with Bragg's diffraction theory and free photon band structure. Both finite-difference time-domain and plane wave expansion methods are used to calculate the resonant frequencies and the photonic band structures in the two-dimensional photonic crystals showing a very good agreement with the experiment results. A 2D nanopatterned transparent anode was also fabricated onto a flexible polyethylene terephthalate (PET) substrate and it was integrated into an organic light-emitting diode (OLED). The obtained results fully confirm the feasibility of the developed process of micro/nano patterning PEDOT:PSS. Engineered polymer electrodes prepared by this unique method are useful in a wide variety of high-performance flexible organic optoelectronics. © 2013 American Chemical Society.


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