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| Main Authors: | , , , |
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| Format: | Preprint |
| Published: |
2024
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2410.23573 |
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| _version_ | 1866929571083845632 |
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| author | Osada, Yuki Takagi, Ryo Arimatsu, Hideki Fujima, Takuya |
| author_facet | Osada, Yuki Takagi, Ryo Arimatsu, Hideki Fujima, Takuya |
| contents | Poly 3,4-ethylenedioxythiophene (PEDOT) has been attracting attention as a thermoelectric material for room-temperature use due to its flexibility and non-toxicity. However, PEDOT reportedly generates insufficient thermoelectric power for practical use. This work tried to improve the Seebeck coefficient by introducing molecular strain to PEDOT molecules by loading a Polystyrene sulfonate (PSS)-free PEDOT on a Polyethyleneterephthalate (PET) fiber. Raman spectroscopy revealed the PEDOT materials with significant compression in the Cα-Cα bond and extension in the Cα=C\b{eta} bond exhibit Seebeck coefficients two orders of magnitude larger than usual. Furthermore, strain in the C\b{eta}-C\b{eta} bond strongly correlated with the Seebeck coefficient that varied in a broad range from -2100 to 3100 μV K-1. This variation indicated that the molecular strain formed a sharp peak or valley around the Fermi level in the density of state (DOS) function, which gradually shifts along with the C\b{eta}-C\b{eta} strain. This molecular strain-induced giant Seebeck effect is expected to be an applicable technique for other polythiophene molecules. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2410_23573 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Giant Seebeck Effect in PEDOT Materials with Molecular Strain Osada, Yuki Takagi, Ryo Arimatsu, Hideki Fujima, Takuya Materials Science Applied Physics Poly 3,4-ethylenedioxythiophene (PEDOT) has been attracting attention as a thermoelectric material for room-temperature use due to its flexibility and non-toxicity. However, PEDOT reportedly generates insufficient thermoelectric power for practical use. This work tried to improve the Seebeck coefficient by introducing molecular strain to PEDOT molecules by loading a Polystyrene sulfonate (PSS)-free PEDOT on a Polyethyleneterephthalate (PET) fiber. Raman spectroscopy revealed the PEDOT materials with significant compression in the Cα-Cα bond and extension in the Cα=C\b{eta} bond exhibit Seebeck coefficients two orders of magnitude larger than usual. Furthermore, strain in the C\b{eta}-C\b{eta} bond strongly correlated with the Seebeck coefficient that varied in a broad range from -2100 to 3100 μV K-1. This variation indicated that the molecular strain formed a sharp peak or valley around the Fermi level in the density of state (DOS) function, which gradually shifts along with the C\b{eta}-C\b{eta} strain. This molecular strain-induced giant Seebeck effect is expected to be an applicable technique for other polythiophene molecules. |
| title | Giant Seebeck Effect in PEDOT Materials with Molecular Strain |
| topic | Materials Science Applied Physics |
| url | https://arxiv.org/abs/2410.23573 |