different voltages. Material systems for resistive memory cells Multiple inorganic and organic material systems display thermal or ionic resistive switching effects. These can be grouped into the following categories: phase-change chalcogenides such as or AgInSbTe binary transition metal oxides such as NiO or perovskites such as Sr(Zr) or PCMO solid-state electrolytes such as GeS, GeSe, or organic charge-transfer complexes such as CuTCNQ organic donor–acceptor systems such as Al AIDCN two dimensional (layered) insulating materials like hexagonal boron nitride RRAM Based on Perovskite ABO3-type inorganic perovskite materials such as BaTiO3, SrRuO3, SrZO3, and SrTiO3 have attracted extensive research interest as the storage media in memristors due to their remarkable resistance switching effects and various functionalities such as ferroelectric, dielectric, and semiconducting physical characteristics. However, the fragile nature and high cost of the fabrication process limit the wide applications of these ABO3-type inorganic perovskite materials for memristors. Recently, ABX3-type lead trihalide perovskites have received extensive research interest for using in optoelectronic devices such as photovoltaics, photodetectors, and light-emitting diodes (LED). In these structures, A is a monovalent organic or inorganic (MA:CH3NH3+, FA: CH(NH2)2+, Cs+, Rb+), B is a divalent metal cation (Pb2+, Sn2+), and X is a halide anion (Cl, Br, I). The A cation resides at the eight corners of the cubic unit and the B cation locates at the center of the octahedral cluster [BX6]4 to form the 3D perovskite structure. According to the different A-site cations, these structures can be classified into organic-inorganic hybrid perovskites and all-inorganic perovskites. Moreover, this type of perovskite can be obtained readily by solution-processable methods at a low cost.[16] Nevertheless, owing to the inclusion of organic cations, it was commonly found that the intrinsic thermal instability of methylammonium (MA) and formamidinium (FA) lead trihalide perovskites was really a bottleneck for the development of hybrid perovskite-based electronic devices. Therefore, to resolve this issue, the organic cations must be substituted by other ions such as Cesium (Cs) cations. Interestingly, there are some reports of Cesium/Cesium hybridization solar cells that give us many new clues for the improved stability of all-inorganic perovskite-based electronic devices. More and more publications demonstrate that inorganic Cs cation-based all-inorganic perovskites could be both structurally and thermally stable above 100 °C, while hybrid perovskites thermally degraded to lead iodide above 85 °C. Therefore, it has been implied that all-inorganic perovskites could be excellent candidates for the fabrication of stable and highly efficient resistive