2D Ca₂Nb₃O₁₀ Optoelectronic Neuromorphic Device for Ultrasensitive UV‐C Vision and Encrypted Communication

Abstract Neuromorphic device that percepts ultraviolet (UV) radiations is essential for supplementing human visual perception. However, UV‐responsive synapses with high sensitivity and wavelength selectivity have not yet been developed so far. Herein, 2D optoelectronic synapses that are able to distinguish between UV‐A, UV‐,B and UV‐C radiations using a single material are demonstrated. The synapses use Ca₂Nb₃O₁₀ nanosheets with wide bandgap and persistent photoconductivity effect (PPC) as UV‐responsive layer. The devices can detect UV‐C rays at ultralow intensity of 70 nW cm⁻², which is the lowest record among 2D UV synaptic devices. Moreover, such a device demonstrates UV image vision, recognition, and memorization functions based on its diverse synaptic behaviors. The atomically thin UV synapses provide implications for enhancing human visual perception capabilities with spectral selectivity, ultrahigh sensitivity, and low‐energy consumption.