Temperature-dependent performance of WS 2 nanotube-based photodetectors

作者：fuchun wang, Shijing Wei, Wenyuan Jin, Xinling He, Wenfeng Wang, Feijiu Wang, Feng Li, Xueyang Zhang, Qinwei An, Xiaobo He, Jinpeng Xu · 发表于：Journal of Physics D Applied Physics · 年份：2025 · DOI：10.1088/1361-6463/adc81d · 被引用次数：4 · 研究领域：2D Materials and Applications、Chalcogenide Semiconductor Thin Films、Nanowire Synthesis and Applications

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 envir...