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Hierarchical structure of PEDOT/PSS and applications to transparent electrodes

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1 Author(s)
Okuzaki, H. ; Interdiscipl. Grad. Sch. of Med. & Eng., Univ. of Yamanashi, Kofu, Japan

Highly conductive films made of poly(3,4-ethylenedioxythiophene) doped with poly(4-styrenesulfonate) (PEDOT/PSS) were prepared by casting the PEDOT/PSS aqueous dispersion of colloidal particles containing ethylene glycol (EG). By addition of 3% of EG, the electrical conductivity was significantly increased from 3 to 430 S/cm. The EG was crucially important for (i) removal of the insulating PSS from the surface of the PEDOT/PSS particles, (ii) crystallization of PEDOT molecules, and (iii) aggregation of the particles, which improved both intra- and inter-particle transfer of charge carriers. A further increase of the EG concentration, however, decreased the conductivity, which was due to the morphological inhomogeneity by the phase segregation.

Published in:

Active-Matrix Flatpanel Displays and Devices (AM-FPD), 2012 19th International Workshop on

Date of Conference:

4-6 July 2012

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