Fully Suspended MoS 2 Photodetectors toward High Response Speed and Stable Responsivity

作者：Jianyong Wei, Zhentao Lian, Yumeng Liu, Maosong Xie, Yueyang Jia, Kai Li, R. Kudrawiec, Yaping Dan, Rui Yang · 发表于：ACS Photonics · 年份：2025 · DOI：10.1021/acsphotonics.5c00146 · 被引用次数：9 · 研究领域：2D Materials and Applications、Nanowire Synthesis and Applications、Perovskite Materials and Applications

High photoresponsivity has been achieved in photodetectors based on two-dimensional (2D) semiconductors, but they usually suffer from low response speed and severe responsivity decay with higher light intensity due to substrate effects. In this work, photodetectors with high response speed and stable responsivity are prepared based on fully suspended MoS 2 . Due to the complete separation of the suspended MoS 2 channel and the Si substrate underneath, the photogating effect is effectively suppressed. Then the photocurrent rise and fall times are measured as 68.6 and 100.0 μs by transient photocurrent measurement, respectively, which are about 10 5 times faster than the nonsuspended devices. Moreover, they exhibit stable responsivity with time within a large range of light intensity. A detailed analysis of the photoresponse mechanisms is performed by comparing the photoresponses from devices with different structures. The results provide a fundamental understanding of photoresponse mechanisms and guide the design of high-performance 2D photodetectors.