Redox-active charge carriers of conducting polymers as a tuner of conductivity and its potential window
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- Redox-active charge carriers of conducting polymers as a tuner of conductivity and its potential window
- Park, Han-Saem; Ko, Seo-Jin; Park, Jeong-Seok; Kim, Jin Young; Song, Hyun-Kon
- PORE-SIZE DISTRIBUTION; ELECTRICAL-CONDUCTIVITY; POROUS-ELECTRODES; PSS FILMS; PEDOT; ENHANCEMENT; MORPHOLOGY; SPECTROSCOPY; SULFONATE; SOLVENTS
- Issue Date
- NATURE PUBLISHING GROUP
- SCIENTIFIC REPORTS, v.3, no., pp.1 - 6
- Electric conductivity of conducting polymers has been steadily enhanced towards a level worthy of being called its alias, "synthetic metal". PEDOT:PSS (poly(3,4-ethylenedioxythiophene) doped with poly(styrene sulfonate)), as a representative conducting polymer, recently reached around 3,000â�...S cm -1, the value to open the possibility to replace transparent conductive oxides. The leading strategy to drive the conductivity increase is solvent annealing in which aqueous solution of PEDOT:PSS is treated with an assistant solvent such as DMSO (dimethyl sulfoxide). In addition to the conductivity enhancement, we found that the potential range in which PEDOT:PSS is conductive is tuned wider into a negative potential direction by the DMSO-annealing. Also, the increase in a redox-active fraction of charge carriers is proposed to be responsible for the enhancement of conductivity in the solvent annealing process.
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