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Solid-State Electrochemical Thermal Transistors

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Title: Solid-State Electrochemical Thermal Transistors
Authors: Yang, Qian Browse this author
Cho, Hai Jun Browse this author
Bian, Zhiping Browse this author
Yoshimura, Mitsuki Browse this author
Lee, Joonhyuk Browse this author
Jeen, Hyoungjeen Browse this author
Lin, Jinghuang Browse this author
Wei, Jiake Browse this author
Feng, Bin Browse this author
Ikuhara, Yuichi Browse this author
Ohta, Hiromichi Browse this author →KAKEN DB
Keywords: electrochemistry
redox treatment
solid state
thermal conductivity
thermal transistors
transition metal oxides
Issue Date: 21-Feb-2023
Publisher: Wiley-Blackwell
Journal Title: Advanced Functional Materials
Volume: 33
Issue: 19
Start Page: 2214939
Publisher DOI: 10.1002/adfm.202214939
Abstract: Thermal transistors that electrically control heat flow have attracted growing attention as thermal management devices and phonon logic circuits. Although several thermal transistors are demonstrated, the use of liquid electrolytes may limit the application from the viewpoint of reliability or liquid leakage. Herein, a solid-state thermal transistor that can electrochemically control the heat flow with an on-to-off ratio of the thermal conductivity (kappa) of approximate to 4 without using any liquid is demonstrated. The thermal transistor is a multilayer film composed of an upper electrode, strontium cobaltite (SrCoOx), solid electrolyte, and bottom electrode. An electrochemical redox treatment at 280 degrees C in air repeatedly modulates the crystal structure and kappa of the SrCoOx layer. The fully oxidized perovskite-structured SrCoO3 layer shows a high kappa approximate to 3 .8 W m(-1) K-1, whereas the fully reduced defect perovskite-structured SrCoO2 layer shows a low kappa approximate to 0.95 W m(-1) K-1. The present solid-state electrochemical thermal transistor may become next-generation devices toward future thermal management technology.
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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