DataVXACS Energy LettersPaper
journal article·2017-04-14

Ultrahigh Thermoelectric Performance in SrNb0.2Ti0.8O3 Oxide Films at a Submicrometer-Scale Thickness

Jikun Chen, Hongyi Chen, Feng Hao, Xinyou Ke, Nuofu Chen, Takeaki Yajima, Yong Jiang, Xun Shi, Kexiong Zhou, Max Döbeli, Tiansong Zhang, Binghui Ge, Hongliang Dong, Huarong Zeng, Wenwang Wu, Lidong Chen

ACS Energy Letters· Volume 2· Issue 4
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Source abstract

Abstract

Localized refrigeration and power generation via thermoelectric technology rely on efficient thermoelectric materials with high performance at room temperature. Although the two-dimensional electron gas (2DEG)-related materials exhibit ultrahigh thermoelectric performance near room temperature, such performance is only preserved at thicknesses within subnanometer scales, limited by the requirement of two-dimensional size confinements. Here we report ultrahigh thermoelectric performance similar to 2DEG-related materials but achieved in SrNb 0.2 Ti 0.8 O 3 oxide films with a submicrometer-scale thickness by regulating strain-induced lattice polarizations and interfacial polarizations. A large figure of merit, zT, and power factor (∼10 2 –10 3 μW cm –1 K –2 ) were achieved near room temperature, and the maximum zT is estimated to be ∼1.6 for a 49 nm thick film. These performances exceed those of the existing n-type thermoelectric materials for room-temperature uses and the reported best oxide materials beyond subnanometer scales. The earth-abundant elemental composition of the oxide film paves the way toward potential applications in thermoelectric thin film devices with a microscale thickness.
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Research context

OpenAlex topics: Advanced Thermoelectric Materials and Devices · Electronic and Structural Properties of Oxides · Magnetic and transport properties of perovskites and related materials

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China

Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China

School of Engineering, The University of Tokyo, Tokyo 1138656, Japan

John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, Massachusetts 02138, United States

School of Renewable Energy, North China Electric Power University, Beijing 102206, China

Ion Beam Physics, ETH Zurich, CH-8093 Zurich, Switzerland

Beijing National Laboratory for Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100190, China

Center for High Pressure Science and Technology Advanced Research, Shanghai 201203, China

Institute of Advanced Structure Technology, Beijing Institute of Technology, Beijing 100081, China

Funding

Ministry of Education of the People's Republic of China · Ministry of Science and Technology of the People's Republic of China · Japan Society for the Promotion of Science · National Natural Science Foundation of China · Chinese Academy of Sciences · Shanghai Government

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