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SYOE: Symposium Organic Thin Film Electronics: From Molecular Contacts to Devices
SYOE 8: Poster Session SYOE
SYOE 8.24: Poster
Tuesday, March 27, 2007, 18:00–20:00, Poster B
Conductivity of transparent Indium-Tin-Oxide-nanoparticle/polymer composite layers — •Norman Mechau1, Anna Prodi-Schwab2, and Roland Schmechel1 — 1Forschungszentrum Karlsruhe, Institut of Nanotechnology, 76021 Karlsruhe, Germany — 2Degussa AG, Science to Business Center, 45764 Marl, Germany
The conductivity and optical absorption behavior of transparent composite layers consisting of conductive polymer poly(3,4-ethylenedioxythiophene)/poly(4-styrene sulfonate) (PEDT:PSS) mixed with high conductive Indium Tin Oxide (ITO) nanoparticles was investigated. Below the percolation threshold of the ITO nanoparticles, at a volume fraction of the ITO ~ 0.16, the conductivity decreases with increase of the ITO content. The reason for this decrease is a compensation of charge carriers between the p-doped PEDT:PSS and the n-doped ITO. By applying a simple harmonic oscillator approximation, based on superposition of two phase system and a partial compensation of carriers the change in the optical characteristics can be explained. Furthermore, the reduction of the total numbers of charge carriers by compensation explains the decrease of conductivity.