open access

https://hdl.handle.net/2115/89536

Solid-State Electrochemical Thermal Transistors

英語

transition metal oxides

2023-02-21

Wiley-Blackwell

Advanced Functional Materials

33(19)

2214939

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.

学術雑誌論文

Version of Record

1616-301X