Thermoelectric properties of a semicrystalline polymer doped beyond the insulator-to-metal transition by electrolyte gating
| Autor: | Naoya Takekoshi, Hiroaki Mada, Hiroshi Ito, Yukihiro Shimoi, Hiromichi Ohta, Kaito Kanahashi, Taishi Takenobu, Hisaaki Tanaka |
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| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Materials science
Magnetoresistance Materials Science 02 engineering and technology Electrolyte 010402 general chemistry 01 natural sciences Condensed Matter::Materials Science Electrical resistivity and conductivity Seebeck coefficient Condensed Matter::Superconductivity Thermoelectric effect Research Articles Applied Physics Conductive polymer chemistry.chemical_classification Quantitative Biology::Biomolecules Multidisciplinary Condensed matter physics Doping SciAdv r-articles Polymer 021001 nanoscience & nanotechnology 0104 chemical sciences Condensed Matter::Soft Condensed Matter chemistry Condensed Matter::Strongly Correlated Electrons 0210 nano-technology Research Article |
| Zdroj: | Science Advances |
| ISSN: | 2375-2548 |
| Popis: | We have clarified a physical guideline for controlling thermoelectric properties of conducting polymers by continuous doping. Conducting polymer thin films containing inherent structural disorder exhibit complicated electronic, transport, and thermoelectric properties. The unconventional power-law relation between the Seebeck coefficient (S) and the electrical conductivity (σ) is one of the typical consequences of this disorder, where no maximum of the thermoelectric power factor (P = S2σ) has been observed upon doping, unlike conventional systems. Here, it is demonstrated that a thiophene-based semicrystalline polymer exhibits a clear maximum of P through wide-range carrier doping by the electrolyte gating technique. The maximum value appears around the macroscopic insulator-to-metal transition upon doping, which is firmly confirmed by the temperature dependence of σ and magnetoresistance measurements. The effect of disorder on charge transport is suppressed in the metallic state, resulting in the conventional S-σ relation described by the Mott equation. The present results provide a physical background for controlling the performance of conducting polymers toward the application to thermoelectric devices. |
| Databáze: | OpenAIRE |
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