Optoelectronically co-modulated neuromorphic synapses with attention and pruning in lead-free perovskite single crystals

Emulating high-order visual cognitive functions in optoelectronic neuromorphic synapse devices is important for advanced artificial vision systems. Herein, high-quality lead-free vacancy-ordered double perovskite Cs₂TiCl₆ single crystals are synthesized to construct optoelectronically co-modulated neuromorphic synapse devices. Electrically, the devices exhibit bipolar resistive switching behavior. Optically, the devices show prominent light-induced synaptic potentiation behaviors. Furthermore, three biomimetic high-order visual cognitive modes are implemented by designing specific asynchronous optoelectronic modulation sequences. Benefiting from the effective noise suppression capability of these modes, the pattern recognition accuracy of the neural network can be improved from the baseline of 31.95% to 74.71%, 69.55%, and 86.52%, respectively. This work provides an innovative material candidate and architectural platform for efficient and noise-tolerant advanced artificial visual perception systems.