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The effect of intermediate layers on the internal electric field in organic semiconductor devices
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Paper Abstract

In this work we study the internal electric field (Vint) present in devices based on an intrinsically semiconducting polymer. Intermediate layers between the indium-tin-oxide and Al electrodes and the photoactive layer are able to influence and alter this electric field. The two commonly used intermediate layers, namely poly(3,4- ethylenedioxythiophene) doped with poly(styrenesulfonate) (PEDOT:PSS) and LiF, are subject of this study. Their influence is studied with Electroabsorption (EA) spectroscopy as well as transient photocurrent measurements under applied bias. While PEDOT:PSS has no significant influence on Vint, introducing LiF increases Vint close to the bandgap of the studied semiconducting polymer. However, using PEDOT:PSS directly influences the spectral EA response. The interface between PEDOT:PSS and the conjugated polymer is studied by impedance spectroscopy. We interpret the results in terms of the presence of charges at the interface.

Paper Details

Date Published: 20 April 2006
PDF: 9 pages
Proc. SPIE 6192, Organic Optoelectronics and Photonics II, 61921W (20 April 2006); doi: 10.1117/12.662885
Show Author Affiliations
Christoph Lungenschmied, Johannes Kepler Univ. Linz (Austria)
Gilles Dennler, Johannes Kepler Univ. Linz (Austria)
Eitan Ehrenfreund, Technion-Israel Institute of Technology (Israel)
Helmut Neugebauer, Johannes Kepler Univ. Linz (Austria)
Niyazi Serdar Sariciftci, Johannes Kepler Univ. Linz (Austria)

Published in SPIE Proceedings Vol. 6192:
Organic Optoelectronics and Photonics II
Paul L. Heremans; Michele Muccini; Eric A. Meulenkamp, Editor(s)

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