Hai Jun Cho

Graphical Abstract Thermal Transistors In article number 2214939, Hiromichi Ohta and co-workers demonstrate solid-state thermal transistors that control the thermal conductivity (κ) of strontium cobaltite by electrochemical redox treatment. Oxidized SrCoO3 shows a higher κ of 3.8 W m−1 K−1 while reduced SrCoO2 shows a lower κ of 0.95 W m−1 K−1. The on/off ratio is 4, and it plays like the shutter of heat flow.

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.