Tear‐Film‐Inspired Moisture‐Resistant and Mechanical Flexible Perovskite Microwire Artificial Visual System

ABSTRACT Perovskites have gained popularity in neural‐morphic artificial vision systems owing to their excellent optoelectronic properties; however, issues such as lead toxicity, instability, and high energy consumption hinder their practical application. Here, we utilize hydrophobic poly(N‐vinylcarbazole) to encapsulate lead‐free CsCu 2 I 3 microwires, mimicking the protective role of human tear film on the visual system. This strategy enables the construction of toxicity‐free, stable, and energy‐efficient artificial synapses with an energy consumption as low as 52 aJ per synaptic event, surpassing that of biological synapses, and the device performance was maintained after 120 days. Notably, the device successfully performed image recognition and memory, classical conditioning, Morse coding, and 16‐bit encoding. The artificial neural network incorporating artificial synapses achieved a recognition accuracy of 92% for handwritten digits. Even after 3000 bending cycles, the device maintained its initial performance.