You’ve felt the heat before — the smartphone that warms while running a navigation app or the laptop that gets too hot for your lap.
The heat produced by electronic devices does more than annoy users. Heat-induced voids and cracking can cause chips and circuits to fail.
Schematic of the experimental thermal transistor. A slice of molybdenum disulfide (MoS2) sits on a piece of silicon dioxide, bathed in a solution of lithium ions. (Sood et al, Nature Communications)