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タイトル: | Disorder-Enhanced Dimensionless Thermoelectric Figure of Merit zT of Non-stoichiometric Organic Conductor (TTT)2I3+δ (δ ≤ 0.1) |
著者: | Yoshino, Harukazu Hasegawa, Akifumi Kuroda, Natsuki Ishikawa, Manabu Tanaka, Rika Kozaki, Masatoshi Nakano, Yoshiaki https://orcid.org/0000-0003-3616-7286 (unconfirmed) Otsuka, Akihiro https://orcid.org/0000-0002-3141-0702 (unconfirmed) Yamochi, Hideki |
著者名の別形: | 石川, 学 中野, 義明 大塚, 晃弘 矢持, 秀起 |
発行日: | 24-Sep-2019 |
出版者: | Physical Society of Japan |
誌名: | Journal of the Physical Society of Japan |
巻: | 88 |
号: | 10 |
論文番号: | 104708 |
抄録: | Sample dependence of dimensionless thermoelectric figure of merit (zT) and power factor (PF) were determined for the non-stoichiometric organic conductor (TTT)2I3+δ (TTT = tetrathiatetracene, δ ≤ 0.1) with the simultaneous measurement of the electrical resistivity (ρ), thermopower (S) and thermal conductivity on small single crystals. Both the zT and PF show large sample dependence between 10 and 310 K, even though all the samples have nearly stoichiometric composition of TTT : I3- ~ 2 : 1 (δ ∼ 0). It was found that both the electrical conductivity (σ = 1/ρ) and S increase at room temperature as disorder — that is phase mismatch among the iodine chains — becomes more pronounced. This behavior contrasts the usual tendency that the S decreases as the σ increases in conventional conductors; and suggests a new strategy to improve the zT and PF by introducing an appropriate type of disorder. |
著作権等: | © 2019 The Physical Society of Japan (J. Phys. Soc. Jpn. 88, 104708.) The full-text file will be made open to the public on 24 September 2020 in accordance with publisher's 'Terms and Conditions for Self-Archiving'. This is not the published version. Please cite only the published version. この論文は出版社版でありません。引用の際には出版社版をご確認ご利用ください。 |
URI: | http://hdl.handle.net/2433/244163 |
DOI(出版社版): | 10.7566/JPSJ.88.104708 |
出現コレクション: | 学術雑誌掲載論文等 |
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