Emulation of brain‐like signal processing is the foundation for development of efficient
learning circuitry, but few devices offer the tunable conductance range necessary for
mimicking spatiotemporal plasticity in biological synapses. An ionic semiconductor which
couples electronic transitions with drift‐diffusive ionic kinetics would enable energy‐efficient
analog‐like switching of metastable conductance states. Here, ionic–electronic coupling in
halide perovskite semiconductors is utilized to create memristive synapses with a dynamic …

Figure S1. Crystal structure of halide perovskites and their memristive characteristics.(A) X-
ray diffraction spectra of MAPbBr3, FAPbBr3, and CsPbBr3 films respectively,(B) Cross-
sectional scanning electron microscope (SEM) images of the halide perovskite films
deposited on ITO-PEDOT: PSS.(C) Energy band diagram of the device architecture
used.(DF) Standard memristor characteristics for MAPbBr3, FAPbBr3 and CsPbBr3-based
thin film devices [Device structure: Au/perovskite/ITO]. A series of organic-inorganic halide …