Transient Resistive Switching for Nonvolatile Memory Based on Water‐Soluble Cs₄PbBr₆ Perovskite Films

All‐inorganic halide perovskite Cs₄PbBr₆ thin films are synthesized at low temperature through a facile chemical deposition method. The deposited films are implemented as a dielectric and dissolvable layer with the Au/Cs₄PbBr₆/PEDOT:PSS/ITO configuration for transient memory electronic devices. The bipolar resistive switching phenomena, good switching cycling (endurance), and long data retention (10⁴ s) are demonstrated on as‐grown nonvolatile memory device to evaluate its high stability, reliability, and reproducibility. The I–V relationship shows ohmic conduction behavior at the low‐resistance state, whereas space charge limited current mechanism is dominating at the high‐resistance state. The conductive filaments formation and rupture, accompanied by Br⁻ vacancies in Cs₄PbBr₆ layer, are employed to elucidate switching mechanism. More interestingly, the soluble insulation layer of the devices is quickly dissolved and the color of films transforms from yellow to white as fast as 2 s in deionized water, which exhibits good transient performance. Moreover, the electrical characteristics as well as optical properties vanish absolutely to further demonstrate the abovementioned transition after the memory devices dissolve in deionized water. This work offers a novel way to prepare disposable electronic memory devices by utilizing cheap perovskite‐based materials for transient electronics memory area as well as implantable electronics systems.