Title :
Hierarchical structure of PEDOT/PSS and applications to transparent electrodes
Author :
Okuzaki, Hidenori
Author_Institution :
Interdiscipl. Grad. Sch. of Med. & Eng., Univ. of Yamanashi, Kofu, Japan
Abstract :
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.
Keywords :
aggregation; carrier mobility; casting; colloids; crystallisation; electrical conductivity; polymer films; segregation; transparency; aggregation; aqueous dispersion; casting; charge carriers; colloidal particles; conductive films; crystallization; electrical conductivity; ethylene glycol; hierarchical structure; inter-particle transfer; intra-particle transfer; morphological inhomogeneity; phase segregation; poly(3,4-ethylenedioxythiophene); poly(4-styrenesulfonate); transparent electrodes; Conductivity; Conductivity measurement; Dispersion; Films; Temperature dependence; Temperature measurement;
Conference_Titel :
Active-Matrix Flatpanel Displays and Devices (AM-FPD), 2012 19th International Workshop on
Conference_Location :
Kyoto
Print_ISBN :
978-1-4673-0399-6
