Effects of the PEDOT interface trap distribution in polymeric OLEDs

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 the means of static current–voltage characterizations and admittance spectra. The measurements have revealed a good agreement with the Nicollian–Brews model returning the density of the interface traps; moreover the role of the trapping rate has been focused in terms of density of carriers available for the conduction.

Peaks in capacitance spectra of PEDOT-PF6 based OLEDs have been modeled in terms of interface traps effect.Figure optionsDownload as PowerPoint slideHighlights
► Four kinds of PEDOT have been tested for ITO/PEDOT/PF6/Al OLEDs.
► Admittance spectra have a good agreement with Nicollian–Brews model.
► Trap distribution parameters have been estimated.
► An interpretation in terms of trap constant time has been proposed.