Self-powered Sb2S3 photodetectors with efficient carrier transport enabled by compact vertical TiO2 nanorods

Antimony sulfide (Sb 2 S 3 ) photodetectors (PDs) possess extensive application prospects. Efficient carrier transport of a PD significantly affects the detectivity and response speed. Herein, we propose an all-inorganic self-powered Sb 2 S 3 PD based on vertical TiO 2 nanorods (NRs). The spray-coated 15-nm TiO 2 thin film as a seed layer ensures the growth of compact vertical TiO 2 nanorod arrays by the hydrothermal method. One-dimensional TiO 2 nanorods facilitate photocarrier separation and transport to enhance device performance. Ultimately, the Sb 2 S 3 PD achieves a responsivity of 0.29 A/W, a specific detectivity of 3.37 × 10 12 Jones, and a response time of 7.8 µs, showing great potential in commercial applications.