### Enhancement of Thermoelectric Properties of PEDOT:PSS Films Prepared Under an Electric FieldEnhancement of Thermoelectric Properties of PEDOT:PSS Films Prepared Under an Electric Field

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 Author Aizawa, Kengo ♦ Chonan, Yasuri ♦ Komiyama, Takao ♦ Yamaguchi, Hiroyuki ♦ Aoyama, Takashi Source SpringerLink Content type Text Publisher Springer US File Format PDF Copyright Year ©2017 Language English
 Subject Keyword PEDOT:PSS ♦ organic thermoelectric materials ♦ electric field ♦ electrical conductivity ♦ Optical and Electronic Materials ♦ Characterization and Evaluation of Materials ♦ Electronics and Microelectronics, Instrumentation ♦ Solid State Physics Abstract Poly(3,4-ethylenedioxythiophene) (PEDOT) and poly(4-styrenesulfonate) (PSS) molecules have positive and negative charge in aqueous solution, respectively. Therefore, PEDOT:PSS film crystal growth is expected to be affected by an external electric field. We have prepared PEDOT:PSS films under an electric field and investigated their thermoelectric properties. PEDOT:PSS films were synthesized by aqueous solution casting on a quartz substrate under electric fields E $_{pr}$ up to 4 kV/cm applied perpendicular to the substrate. With increase of E $_{pr}$, the electrical conductivity σ increased from 1.5 S/cm for E $_{pr}$ = 0 kV/cm to 8.0 S/cm for E $_{pr}$ = 1 kV/cm, then saturated for E $_{pr}$ above 1 kV/cm. On the other hand, the Seebeck coefficient S was almost constant at 16 μV/K for all E $_{pr}$ values. The power factor S $^{2}$ σ improved from 0.04 μW/m-K$^{2}$ for E $_{pr}$ = 0 kV/cm to 0.20 μW/m-K$^{2}$ for E $_{pr}$ = 1 kV/cm. The transient photocurrent was also increased by applying E $_{pr}$. X-ray photoelectron spectroscopy (XPS) analysis showed that the molecular ratio of PEDOT to PSS molecules was significantly increased by applying an electric field during film formation. These results suggest that the electric field promoted PEDOT:PSS crystal growth near the film surface, resulting in improved thermoelectric properties due to enhanced carrier mobility. ISSN 03615235 Age Range 18 to 22 years ♦ above 22 year Educational Use Research Education Level UG and PG Learning Resource Type Article Publisher Date 2017-04-24 Publisher Place New York e-ISSN 1543186X Journal Journal of Electronic Materials Volume Number 46 Issue Number 8 Page Count 5 Starting Page 5145 Ending Page 5149