• First demonstration of surface-patterned 2D Dion-Jacobson perovskite microplates for enhanced light absorption.
• BPB-based photodetectors achieve high on/off ratio (~5000), responsivity (2.24 A/W), and detectivity (~10^13 Jones) in UV region.
• Successful application in weak-light communication, imaging, and polarized light detection.
• Surface light management strategy provides a new avenue for improving optoelectronic device performance.