Binghamton University
Department of Physics, Applied Physics and Astronomy
Materials Science & Engineering
PHYSICS & MATERIALS COLLOQUIUM
“Effects of Plasmonic Electrodes on the Optical and Morphological
Properties of Conjugated Polymer Thin-Films”
Deirdre O'Carroll
Rutgers University
Abstract:
We employ large-area nanoporous metal (NPM) plasmonic back electrodes for light extraction and
emission enhancement from light-emitting polymer layers for organic light-emitting device
applications. We find that while light-scattering by the NPM is highly dependent on pore diameter,
enhancements in light emission from polymer layer coatings do not correlate well with pore diameter.
Photoluminescence emission intensity enhancements of up to 12 and 30 are found for the disordered
NPM/polymer composites with pore depths of 50 and 100 nm, respectively (with pore diameter
approximately constant), which we attribute to a combination of far-field scattering and absorptioninduced transparency (AIT) effects. In addition, from grazing-incidence wide-angle x-ray scattering
studies, we find that the porous structure of NPM causes polymer chains to planarize and exhibit
greater intermolecular order compared to planar polymer-on-metal films. In addition to NPM, we
investigate the morphological and plasmonic mode contributions of metal nanoparticle array (MNPA)
electrodes to organic photovoltaic active layer performance. In this work, we find evidence for both
surface plasmon polariton and in-plane AIT-type effects in MNPA electrodes coated with a range of
organic semiconductor absorber layers.
Monday, November 10, 2014
Science Library Room 212
PRESENTATION BEGINS AT 11:00 AM
ALL ARE WELCOME – COFFEE AND REFRESHMENTS AT 10:45 AM