Broadband Photodetectors Based on Perovskite Crystalline Arrays for Motion Detection

Broadband photodetectors are highly promising for applications in motion recognition and intelligent sensing systems. Currently, broadband detection mainly employs heterojunction structures that utilize material stacking or doping to achieve broadband absorption. However, multi-interface defects, lattice mismatch, and intricate transfer processes significantly increase fabrication complexity and pose challenges to the uniformity of the devices and the stability of their performance. In this work, large-area single-component MAPbBr 3 microwire arrays and corresponding photodetector devices were successfully fabricated via a template-assisted growth method. Owing to the synergistic effects of in-bandgap and sub-bandgap photon absorption, the device exhibits an excellent photoresponse across a broad spectrum, including wavelengths of 405 nm, 532 nm, 671 nm, and 808 nm. Besides, the photodetector demonstrates high responsivity ( R max = 70 A/W) and high specific detectivity (D* max = 7.55 × 10 13 Jones). Under 532 nm laser illumination, a pronounced open-circuit voltage of 0.17 V was observed, indicating its potential for self-powered operation. Finally, using this arrayed photodetector, moving object detection under simulated sunlight irradiation was successfully demonstrated, offering a viable technical approach for noncontact motion monitoring.