A Dual-nanograting perovskite structure for photodetectors with enhanced light trapping

Perovskite crystals show great potential for application in photodetectors due to their superior optoelectronic properties. However, their smooth surfaces cause strong reflection and poor light trapping, limiting performance. To address this, a nanograting was engineered on both crystal surfaces to suppress reflection and enhance absorption. Experiments and simulations confirm that the structure induces strong optical field localization, improving light-harvesting efficiency and reducing optical losses. A photodetector based on the Dual-nanograting achieves 200% responsivity compared with the Planar reference device. An optical information processing system based on this structure further demonstrates potential for application in optical communication and intelligent sensing.