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Proceedings Paper

Switching of the hole injection barrier in blue polymer light-emitting diodes
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Paper Abstract

The contact energy barrier of poly(3,4-ethylenedioxythiophene) doped with poly(styrene sulfonic acid) (PEDOT:PSS) on poly(9,9-dioctylfluorene) (PFO) amounts to 1 eV, resulting in a hole injection current that is reduced by 6-7 orders of magnitude. However, upon electrical addressing it is demonstrated that the hole contact barrier completely vanishes, resulting in an Ohmic contact. Furthermore, a change of the built-in electric field has been observed with two different techniques. The shift of the built-in electric field is in agreement with a charge dipole layer that reduces the injection energy barrier for the PEDOT:PSS/PFO contact.

Paper Details

Date Published: 8 September 2004
PDF: 7 pages
Proc. SPIE 5464, Organic Optoelectronics and Photonics, (8 September 2004); doi: 10.1117/12.546039
Show Author Affiliations
Teunis van Woudenbergh, Rijksuniv. Groningen (Netherlands)
Paul W. M. Blom, Rijksuniv. Groningen (Netherlands)

Published in SPIE Proceedings Vol. 5464:
Organic Optoelectronics and Photonics
Paul L. Heremans; Michele Muccini; Hans Hofstraat, Editor(s)

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