Li Yanyan, Li Shunran, Chen Du, Kocoj Conrad A, Yang Ankun, Diroll Benjamin T, Guo Peijun
Department of Chemical and Environmental Engineering, Yale University, 9 Hillhouse Avenue, New Haven, CT 06520, USA.
Energy Sciences Institute, Yale University, 810 West Campus Drive, West Haven, CT 06516, USA.
Sci Adv. 2024 Dec 13;10(50):eadk2778. doi: 10.1126/sciadv.adk2778.
The detection of mid-infrared (MIR) light is technologically important for applications such as night vision, imaging, sensing, and thermal metrology. Traditional MIR photodetectors either require cryogenic cooling or have sophisticated device structures involving complex nanofabrication. Here, we conceive spectrally tunable MIR detection by using two-dimensional metal halide perovskites (2D-MHPs) as the critical building block. Leveraging the ultralow cross-plane thermal conductivity and strong temperature-dependent excitonic resonances of 2D-MHPs, we demonstrate ambient-temperature, all-optical detection of MIR light with sensitivity down to 1 nanowatt per square micrometer, using plastic substrates. Through the adoption of membrane-based structures and a photonic enhancement strategy unique to our all-optical detection modality, we further improved the sensitivity to sub-10 picowatt-per-square-micrometer levels. The detection covers the mid-wave infrared regime from 2 to 4.5 micrometers and extends to the long-wave infrared wavelength at 10.6 micrometers, with wavelength-independent sensitivity response. Our work opens a pathway to alternative types of solution-processable, long-wavelength thermal detectors for molecular sensing, environmental monitoring, and thermal imaging.
中红外（MIR）光的检测在诸如夜视、成像、传感和热计量等应用中具有重要的技术意义。传统的MIR光电探测器要么需要低温冷却，要么具有涉及复杂纳米制造的精密器件结构。在此，我们设想通过使用二维金属卤化物钙钛矿（2D-MHPs）作为关键构建块来实现光谱可调谐的MIR检测。利用2D-MHPs的超低平面内热导率和强烈的温度依赖性激子共振，我们展示了在室温下使用塑料基板对MIR光进行全光学检测，灵敏度低至每平方微米1纳瓦。通过采用基于膜的结构和我们全光学检测模式特有的光子增强策略，我们进一步将灵敏度提高到每平方微米低于10皮瓦的水平。该检测覆盖了从2到4.5微米的中波红外波段，并延伸到10.6微米的长波红外波长，具有与波长无关的灵敏度响应。我们的工作为用于分子传感、环境监测和热成像的替代类型的可溶液加工长波长热探测器开辟了一条途径。
