One‐Pot Hydrothermal Synthesis of Single‐Crystalline BiSbS 3 Microrods for Efficient Visible Photodetection

ABSTRACT Bismuth antimony sulfide (BiSbS 3 ) is a promising, low‐cost, and earth‐abundant ternary semiconductor. Its tunable bandgap of 1.2–1.7 eV, combined with high carrier mobility and strong light absorption, makes it ideal for optoelectronic applications. In this study, we have successfully synthesized single‐crystalline BiSbS 3 microrods via a one‐pot hydrothermal process using BiCl 3 , SbCl 3 , and thioacetamide as precursors and demonstrated their promising performance in photodetectors. The structure and composition are confirmed by scanning electron microscopy, X‐ray diffraction, X‐ray photoelectron spectroscopy, and high‐resolution transmission electron microscopy characterizations. The unique 1D morphology of BiSbS 3 significantly enhances light absorption and carrier transport, leading to improved sensitivity and efficiency in light detection. The photodetector based on a single BiSbS 3 microrod manifests an impressive photodetection performance, achieving a switching ratio of 165.2 at a bias voltage of 6 V under 790 nm monochromatic light, a responsivity of 82 A/W, an external quantum efficiency of 18,289%, a detectivity of 2.8 × 10 10 Jones, and fast response times (6.3 ms rise and 4.8 ms fall). These findings highlight the potential of BiSbS 3 microrods for high‐performance, cost‐effective optoelectronic devices.