Solid‐State Iontronic Devices: Mechanisms and Applications

Abstract Iontronics is a newly emerging interdisciplinary concept that studies the science and technology of electronic‐ionic coupled properties/functions, endowing the devices with new functions and properties by coupling the advantages of electrons and ions. Solid‐state iontronics, one of the most important branches of iontronics, refers to the iontronic devices that work in solid‐state environments, which attracts particular attention due to its overwhelming advantages, for example, the enhanced thermal/mechanical/electrochemical stability. Herein, the interesting ion‐involved working principles of various solid‐state iontronic devices, including energy storage, electromechanics, electrochromism, electroluminescence, and conductance switching, are reviewed. Meanwhile, the perspectives on developing multifunctional integrated iontronic devices and molecular iontronic devices are also addressed, aiming to meet the growing demands for next‐generation intellectual products. We believe that this review can encourage further exploration in this exciting research field.