Enhancement of Thermoelectric Properties of PEDOT:PSS Films Prepared Under an Electric Field
| Autor: | Yasunori Chonan, Takao Komiyama, Takashi Aoyama, Kengo Aizawa, Hiroyuki Yamaguchi |
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| Rok vydání: | 2017 |
| Předmět: |
010302 applied physics
Electron mobility Materials science business.industry Analytical chemistry 02 engineering and technology 021001 nanoscience & nanotechnology Condensed Matter Physics Thermoelectric materials 01 natural sciences Electronic Optical and Magnetic Materials law.invention PEDOT:PSS Electrical resistivity and conductivity law Electric field Seebeck coefficient 0103 physical sciences Thermoelectric effect Materials Chemistry Optoelectronics Electrical and Electronic Engineering 0210 nano-technology business Electron paramagnetic resonance |
| Zdroj: | Journal of Electronic Materials. 46:5145-5149 |
| ISSN: | 1543-186X 0361-5235 |
| Popis: | 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 Epr up to 4 kV/cm applied perpendicular to the substrate. With increase of Epr, the electrical conductivity σ increased from 1.5 S/cm for Epr = 0 kV/cm to 8.0 S/cm for Epr = 1 kV/cm, then saturated for Epr above 1 kV/cm. On the other hand, the Seebeck coefficient S was almost constant at 16 μV/K for all Epr values. The power factor S2σ improved from 0.04 μW/m-K2 for Epr = 0 kV/cm to 0.20 μW/m-K2 for Epr = 1 kV/cm. The transient photocurrent was also increased by applying Epr. 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. |
| Databáze: | OpenAIRE |
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