Temperature-dependent performance of WS₂ nanotube-based photodetectors

Abstract Temperature significantly impacts responsivity, detectivity, and stability of photodetectors, which are crucial for converting optical signals to electrical signals in applications like optical communication and imaging. WS 2 , a transition metal dichalcogenide with tunable band gaps and high carrier mobility, shows promise in optoelectronics. However, previous studies on WS 2 nanotube-based photodetectors primarily focused on room temperature conditions and traditional synthesis methods, which have limitations in morphology control and reproducibility. In contrast, this study explores the temperature-dependent performance of WS 2 nanotube-based photodetectors synthesized via a gold nanoparticle-catalyzed chemical vapor deposition process. This method allows for better control over the nanotube morphology and size. The optoelectronic properties, including responsivity and detectivity, were evaluated across a temperature range of 50–300 K. Results show that the photodetectors exhibit enhanced on–off ratios and reduced dark currents at lower temperatures, improving signal-to-noise ratios. The devices also demonstrated excellent stability over multiple cycles, as well as consistent performance under varying optical power densities. These findings highlight the potential of WS 2 nanotube photodetectors for applications in extreme temperature environments, such as space communication and low-temperature optical imaging systems, where devices must operate under harsh environmental conditions.