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Thin film growth and thermoelectric properties of electron conducting oxides

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Title: Thin film growth and thermoelectric properties of electron conducting oxides
Authors: Ohta, Hiromichi Browse this author →KAKEN DB
Keywords: Thermoelectric
Thin films
Two-dimensional electron gas
Issue Date: Jul-2022
Publisher: 社団法人 日本セラミックス協会(The Ceramic Society of Japan)
Journal Title: Journal of the Ceramic Society of Japan
Volume: 130
Issue: 7
Start Page: 471
End Page: 476
Publisher DOI: 10.2109/jcersj2.22061
Abstract: Thermoelectric energy conversion attracts increasing attention as a technology for effectively reusing waste heat. Although thermoelectric materials that show a good thermoelectric figure of merit (ZT) have been proposed thus far, they are not practical at all because they are thermally and chemically unstable and composed of toxic elements. In order to address this issue, the author focused on metal oxides as thermoelectric materials that are thermally and chemically stable and non-toxic, and succeeded in significantly improving thermoelectric ZT by using two-dimensional electron gas and elemental substitution. In 2007, the author focused on Prof. Dresselhaus's theory that by confining carriers in a quantum well thinner than the thermal de Broglie wavelength, the thermoelectric power can be greatly enhanced without lowering the conductivity, and the oxide superlattice was introduced. In 2010, the author demonstrated a field-effect transistor structure on an insulator SrTiO3 crystal and measured thermopower while inducing 2DEG with a thickness of 2 nm by applying a voltage, similar to an artificial superlattice. It was discovered that the thermoelectric field can be increased 5 times as much as the bulk ratio. Furthermore, in 2020, the author found that the Ba1/3CoO2 thin film with a layered crystal structure had the highest room temperature ZT of 0.11 among metal oxides. (C) 2022 The Ceramic Society of Japan. All rights reserved.
Type: article
Appears in Collections:電子科学研究所 (Research Institute for Electronic Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

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