An air-stable two-dimensional perovskite artificial synapse

Organometal halide perovskites (OHPs) exhibit extraordinary properties in the emulation of synaptic plasticity in artificial synaptic electronic devices. However, the instability of OHPs has hindered their further application. Here, a novel two-terminal artificial synapse based on two-dimensional perovskite (R-MPEA)1.5PbBr3.5(DMSO)0.5 was developed to address this challenge. Essential biological functions including excitatory post-synaptic current, paired-pulse facilitation, spike-number dependent plasticity, spike-voltage dependent plasticity, spike-duration dependent plasticity, and spike-rate dependent plasticity, have been demonstrated in OHP-based synaptic devices. More importantly, this is the first demonstration of an air-stable OHP-based artificial synapse. The OHP-based synaptic device achieved extremely low energy consumption (∼21 fJ per event) in short-term memory and exhibited good stability at ambient atmosphere over 300 h. These results may open a new avenue for next-generation synaptic electronics and neuromorphic computing.