Lateral Artificial Synapses on Hybrid Perovskite Platelets with Modulated Neuroplasticity

Abstract Polycrystalline organometal halide perovskite films have been recently exploited as the active layer in artificial synapses, demonstrating the basic functional emulation of biological synapses. However, for the implementation of neuromorphic computing and bioinspired intelligent systems, full synapse‐like functionality with a simple structure and extremely low energy consumption are of crucial importance. Here, a modified thickness‐confined surfactant‐assistant self‐assembly strategy is proposed to synthesize CH 3 NH 3 PbBr 3 single‐crystalline thin platelets (SCTPs) and a two‐terminal lateral‐structured synaptic device with ultralow operating current down to sub‐pA is fabricated. Essential synaptic behaviors are realized, including paired‐pulse facilitation, spike‐dependent plasticity, transition from sensory memory to short‐term memory and potentiation/depression. Furthermore, the activity‐dependent plasticity is also demonstrated on the SCTP‐based artificial synapse, which may enable nociceptors to detect intense external harm. These results provide a new protocol for designing lateral‐structured synaptic devices based on hybrid perovskite SCTPs and future neuromorphic bioelectronics.