Cao Zhangyu, Ju Le, Wei Binbin, Wang Suofu, Wu Yanwei, Han Tao, Wei Xiangfei, Wang Wenhui, Li Feng, Shan Lei, Long Mingsheng
Information Materials and Intelligent Sensing Laboratory of Anhui Province, Key Laboratory of Structure and Functional Regulation of Hybrid Materials of Ministry of Education, Institutes of Physical Science and Information Technology, Anhui University, 111 Jiu Long Road, Hefei, 230601, China.
Department of Electronics and Information Engineering, BoZhou University, 2266 Tangwang Road, Bozhou, 236800, China.
Small. 2024 Nov;20(44):e2401194. doi: 10.1002/smll.202401194. Epub 2024 Jul 10.
High-sensitive uncooled mid-wave infrared (MWIR) photodetection with fast speed is highly desired for biomedical imaging, optical communication, and night vision technology. Low-dimensional materials with low dark current and broadband photoresponse hold great promise for use in MWIR detection. Here, this study reports a high-performance MWIR photodetector based on a titanium trisulfide (TiS) nanoribbon. This device demonstrates an ultra-broadband photoresponse ranging from the visible spectrum to the MWIR spectrum (405-4275 nm). In the MWIR spectral range, the photodetector achieves competitive high photoresponsivity (R) of 21.1 A W, and an impressive specific detectivity (D*) of 5.9 × 10 cmHz W in ambient air. Remarkably, the photoresponse speed in the MWIR with τ = 1.3 ms and τ = 1.5 ms is realized which is much faster than the thermal time constant of 15 ms. These findings pave the way for highly sensitive, room-temperature MWIR photodetectors with exceptionally fast response speed.
对于生物医学成像、光通信和夜视技术而言，非常需要具有快速响应速度的高灵敏度非制冷中波红外（MWIR）光电探测。具有低暗电流和宽带光响应的低维材料在MWIR探测中具有很大的应用潜力。在此，本研究报道了一种基于三硫化钛（TiS）纳米带的高性能MWIR光电探测器。该器件展示了从可见光谱到MWIR光谱（405 - 4275 nm）的超宽带光响应。在MWIR光谱范围内，该光电探测器在环境空气中实现了具有竞争力的高光响应率（R），为21.1 A/W，以及令人印象深刻的比探测率（D*），为5.9×10¹² cmHz¹/²W⁻¹。值得注意的是，实现了MWIR中的光响应速度，τ = 1.3 ms和τ = 1.5 ms，这比15 ms的热时间常数快得多。这些发现为具有超快响应速度的高灵敏度室温MWIR光电探测器铺平了道路。
