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SUMMARY:Polymer-based Optoelectronic Devices with Interlayers - Dieter Neh
 er\, University of Potsdam
DTSTART:20070115T143000Z
DTEND:20070115T153000Z
UID:TALK6111@talks.cam.ac.uk
CONTACT:Chris McNeill
DESCRIPTION:Recently\, a novel approach to insert ultrahin polymer layers 
 with well-controllable electronic properties into solution-processed optoe
 lectronic device structures has been proposed [1]. This approach allows to
  establish property-function relationships\, which are not accessible by t
 he study of conventional blend device. Experiments on electrophosphorescen
 t devices as well as Kelvin-probe experiments under illumination show that
  these layers are dense and exhibit a strong electron-blocking function [2
 ]. Upon proper choice of the HOMO and LUMO level of the interlayer materia
 l\, efficient recombination of charges at the interface could be realized.
  Comparable studies on bilayer and solar cell devices based on poly(p-phen
 ylene vinylenes) suggest that the performance of these devices is not dete
 rmined by charge transport and free carrier recombination. This supports t
 he view that the efficiency to form free carriers is the main limiting fac
 tor.\n\n[1] J. S. Kim\, R. H. Friend\, I. Grizzi\, J. H. Burroughes\, Appl
 . Phys. Lett. 87 (2006) 023506.\n[2] X.H. Yang\, F. Jaiser\, B. Stiller\, 
 D. Neher\, F. Galbrecht\, U. Scherf\, Adv. Funct. Mater. 16 (2006) 2156\n
LOCATION:Small Lecture Theatre\, Cavendish Laboratory\, Department of Phys
 ics
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