(a) Schematic diagram of the Ag/CH₃NH₃PbI₃/Au device excited by broadband visible light and bias voltage and (b) I–V characteristics of the set processes with different light illumination intensities. Inset shows the reset processes.^[49] Copyright (2017) John Wiley & Sons, Inc. (c) Schematic diagram of the Ag/MAPbI₃/Ag device and (d) I–V curves of the MAPbI₃-based memristor measured with different illumination intensities.^[50] Copyright (2018) American Chemical Society. (e) Schematics of the Ag/CH₃NH₃PbI₃/ITO synaptic device and CH₃NH₃PbI₃ structure, (f) the changes of PSC value under the electrical, light, and co-stimulations.^[51] Copyright (2019) John Wiley & Sons, Inc. (g) Schematic image of the Au/MAPbI_3–xCl_x/ITO memristor and (h) its photo-assisted set and electrical reset processes.^[62] Copyright (2018) John Wiley & Sons, Inc.