Title :
Effects of the PEDOT interface states distribution in polymeric OLEDs
Author :
Petrosino, Mario ; Rubino, Alfredo ; Miscioscia, Riccardo ; Minarini, Carla
Author_Institution :
Dept. of Inf. & Electr. Eng., Univ. of Salerno, Salerno, Italy
Abstract :
Four kinds of commercial PEDOT dispersions have been used to realize ITO/PEDOT/PF6/Al polymeric OLEDs. The effects of the different PEDOT layers have been analyzed by using static current-voltage characterizations and dynamical admittance spectra. The measurements have revealed that the current transport is limited by the PEDOT bulk (conductivity) and not by the PEDOT work function (hole potential barrier). Moreover, admittance spectra have shown an interface state distribution having, for the tested PEDOT dispersions, similar densities but very different time constants (about 3 orders of variation). A good agreement has been found between the experimental data and the Nicollian-Brews interface states model.
Keywords :
aluminium; conducting polymers; electrical conductivity; indium compounds; interface states; organic light emitting diodes; organic semiconductors; work function; Nicollian-Brews interface state model; PEDOT dispersions; conductivity; current transport; dynamical admittance spectra; hole potential barrier; interface state distribution; polymeric OLEDs; static current-voltage characterizations; time constants; work function; Admittance; Capacitance; Circuits and systems; Conductivity; Frequency; Indium tin oxide; Interface states; Organic light emitting diodes; Performance analysis; Signal analysis; OLED; PEDOT; admittance spectroscopy;
Conference_Titel :
Signals, Circuits and Systems (SCS), 2009 3rd International Conference on
Conference_Location :
Medenine
Print_ISBN :
978-1-4244-4397-0
Electronic_ISBN :
978-1-4244-4398-7
DOI :
10.1109/ICSCS.2009.5412554
