Abstract
AbstractPoly(3,4-ethylenedioxythiophene):poly(styrene sulfonate) (PEDOT:PSS) is a prototypical conducting polymer. When a polar solvent is used during film fabrication, the hole-doped PEDOT oligomers form crystalline clusters in the films, exhibiting high conductivity. However, whether hole carriers exhibit band transport has not been clarified yet. Here, we employ a multilayer spin-coating method using an aqueous solution with ethylene glycol, with additional procedures of dipping the films in ethylene glycol or dropping sulfuric acid onto the films, to achieve a high DC conductivity of ∼1000 S cm−1 or higher. Using terahertz time-domain spectroscopy and far-infrared-to-ultraviolet reflection spectroscopy, we derive complex optical conductivity $$\widetilde{\sigma }$$
σ
̃
spectra, which are reproduced by the sum of the Drude response, and Lorentz-oscillator responses due to phonons. These results demonstrate the band transport, which is further confirmed by the Hall effect measurements. The hole mobility estimated from the spectral analyses is 7–11 cm2 V−1 s−1, a significantly large value. The reported evaluation methods for broadband $$\widetilde{\sigma }$$
σ
̃
spectra can help elucidate carrier transport mechanisms in various conducting films.
Funder
MEXT | Japan Society for the Promotion of Science
MEXT | JST | Core Research for Evolutional Science and Technology
The program for Leading Graduate Schools
The University Fellowship Program for Science and Technology Innovations of Japan Science and Technology Agency
Pioneering Research Initiated by Next Generation of Japan Science and Technology Agency
Publisher
Springer Science and Business Media LLC
Cited by
1 articles.
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