Superhydrophobic and Radiative Cooling Hierarchical Membrane for High-Performance, Durable, and Flexible...

Biomimetic optoelectronic synaptic devices have garnered significant attention for their ability to emulate biological behaviors, such as brain-like visual perception, at the device level. However, conventional devices are limited when exposed to solar radiation and rainy weather for outdoor working, including surface contamination, structural damage and reduced electrical performance. Herein, a lightweight, waterproof, and thermally comfortable superhydrophobic elastic silicone-containing polyurethane (SESPU) membrane is developed for optoelectronic synaptic devices. Under UV illumination, the device successfully mimics multiple synaptic functions, including excitatory postsynaptic currents, short-/long-term plasticity, and human brain-like learning behaviors. Notably, the device demonstrates exceptional dual-selective cooling performance, achieving a maximum cooling effect of 10.6 °C under solar radiation, thereby ensuring accurate and stable operation in harsh environments. This work presents an innovative strategy for designing biomimetic optoelectronic synaptic devices with enhanced environmental adaptability and long-term durability.