Microcavity‐Enhanced Polarization Photodetection in Antimony Selenide Nanotube‐Based Near‐Infrared Photodetectors

This study presents the polarization photodetection enhancement in Sb 2 Se 3 nanotube (NT)‐based near‐infrared (NIR) photodetectors through simulation‐based and experimental investigations. High‐quality single‐crystal Sb 2 Se 3 NTs are grown via chemical vapor deposition and characterized by using multiple techniques. The optical simulation reveals a remarkable difference in the light absorption ratio (specifically, absorption along the NT/nanowire (NW) against absorption perpendicular to the NT/NW) between Sb 2 Se 3 NT and NW of the same size in the NIR region. The complementary photodetection experiments present that the fabricated Sb 2 Se 3 NT photodetector demonstrates enhanced polarization photodetection in the NIR range, as indicated by a significantly increased dichroic ratio (3.03 at 850 nm) compared to that of similar‐sized NW counterpart (1.81 at 850 nm). Additionally, the Sb 2 Se 3 NT photodetector exhibits exceptional performance, with a high responsivity of 4.18 A W −1 and specific detectivity of 8.94 × 10 10 Jones under 830 nm light illumination. This study provides a comprehensive understanding of the microcavity resonance effect and its role in polarization photodetection enhancement, highlighting the potential of self‐assembled Sb 2 Se 3 NTs in high‐performance near‐infrared polarized photodetection and other relevant applications.