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Proceedings Paper

Development of printed ITO coatings on PET and PEN foil for flexible organic photodiodes
Author(s): S. Heusing; P. W. Oliveira; E. Kraker; A. Haase; C. Palfinger; M. Veith
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Paper Abstract

ITO (tin doped indium oxide) coatings with a sheet resistance of 2 to 3 kΩ(square) were produced by gravure printing process on PET and PEN foil. The printing paste consisted of ITO nanoparticles which were dispersed in a solvent by using a surfactant. The dispersion was mixed with a binder and a photo initiator before printing. The printed films were hardened under UV-irradiation at low temperatures (< 130°C). The sheet resistance could be decreased by heat treatment at 120°C under forming gas atmosphere (N2/H2) to 1.5 kΩ(square). The transmission of the ITO coated PET and PEN foils is more than 80 % in the visible range. The ITO films were directly used as the bottom electrode in an organic photodiode (OPD). The setup of the OPD originates from the well known Tang photodiode, consisting of a stacked layer of copper phthalocyanine (p-type material) and perylene tetracarboxylic bisbenzimidazole (n-type material). The photodiodes are characterised via current-voltage (I-V) characteristics. The performance of the photodiodes with printed ITO on plastic substrates could be improved by the deposition of a PEDOT/PSS layer (Baytron(R) P) on the ITO coated foils and was then comparable to the performance of photodiodes with semi-transparent gold as anode on PET substrates. These results demonstrate the suitability of the printed ITO layers as anode for organic photodiodes.

Paper Details

Date Published: 15 May 2008
PDF: 12 pages
Proc. SPIE 6999, Organic Optoelectronics and Photonics III, 69992I (15 May 2008); doi: 10.1117/12.781247
Show Author Affiliations
S. Heusing, INM, Leibniz-Institut für Neue Materialien GmbH (Germany)
P. W. Oliveira, INM, Leibniz-Institut für Neue Materialien GmbH (Germany)
E. Kraker, JOANNEUM Research Forschungsgesellschaft mbH (Austria)
A. Haase, JOANNEUM Research Forschungsgesellschaft mbH (Austria)
C. Palfinger, JOANNEUM Research Forschungsgesellschaft mbH (Austria)
M. Veith, INM, Leibniz-Institut für Neue Materialien GmbH (Germany)

Published in SPIE Proceedings Vol. 6999:
Organic Optoelectronics and Photonics III
Paul L. Heremans; Michele Muccini; Eric A. Meulenkamp, Editor(s)

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