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Electron Sandwich Doubles the Thermoelectric Power Factor of SrTiO3

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Title: Electron Sandwich Doubles the Thermoelectric Power Factor of SrTiO3
Authors: Zhang, Yuqiao Browse this author
Ohta, Hiromichi Browse this author →KAKEN DB
Keywords: de Broglie wavelength
SrTiO3-SrNbO3 solid-solution
superlattice
thermoelectric power factor
two-dimensionality
Issue Date: 8-May-2019
Publisher: Wiley-Blackwell
Journal Title: physica status solidi (a)
Volume: 216
Issue: 9
Start Page: 1800832
Publisher DOI: 10.1002/pssa.201800832
Abstract: Thermoelectric materials convert a temperature difference into electricity through a phenomenon known as the Seebeck effect, and their efficiency is determined by the dimensionless figure of merit, ZT (equivalent to S-2.sigma.kappa(-1)). Currently, most materials exhibiting high ZT values (ZT>1) are based on heavy metal compounds, but these materials have low thermal/chemical stability. In this regard, conducting metal oxides attract much attention for thermoelectric power generations at high temperatures based on their advantages in thermal stability over heavy metal compounds. However, the thermoelectric performance of metal oxides is usually low. Here the authors review that an enhanced two-dimensionality is efficient for enhancing the thermoelectric power factor of metal oxides. The authors fabricate SrTiO3-based superlattices of [N unit cell SrTi1-xNbxO3|11 unit cell SrTiO3](10), of which the de Broglie wavelengths can be tuned by the substitution of Nb. The maximum power factor of the superlattice composed of the long de Broglie wavelength SrTi1-xNbxO3 exceeds approximate to 5mWm(-1)K(-2), which doubles the value observed from the optimized bulk SrTi1-xNbxO3. This finding can help to reduce the amount of wasted heat and thus wasted fossil fuel in daily activities and industrial factories.
Rights: This is the peer reviewed version of the following article: Zhang, Y. and Ohta, H. (2019), Electron Sandwich Doubles the Thermoelectric Power Factor of SrTiO3. Phys. Status Solidi A, 216: 1800832, which has been published in final form at https://doi.org/10.1002/pssa.201800832 . This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions.
Type: article (author version)
URI: http://hdl.handle.net/2115/77935
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)

Submitter: 太田 裕道

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