Liu Shilin, Ding Yijing, Rong Wenzhe, Xu Yi, Li Yuwei, Onwudiwe Damian Chinedu, Bae Byung Seong, Ertuğrul Mehmet, Zhu Ying, Wu Zhong, Lei Wei, Li Qing, Xu Xiaobao
The Interdisciplinary Center, School of Electronic Science and Engineering, Southeast University, Nanjing 210000, China.
Department of Chemistry, School of Mathematics and Physical Sciences Faculty of Natural and Agricultural Sciences North-West University, Mafikeng Campus, Private Bag X2046, Mmabatho 2735, South Africa.
ACS Nano. 2024 Sep 10;18(36):25226-25236. doi: 10.1021/acsnano.4c07628. Epub 2024 Aug 24.
The combination of sensing invisible ultraviolet photons and infrared radiation can significantly enhance target recognition by offsetting their own limit in a short sensing range and poor spatial resolution. However, the difference in their wavelength sets unique requirements for sensing materials and devices, which makes it hard to establish their implementation in a single detector. In this work, we present the design of a single detector with CHNHPbCl (MAPbCl) for distinguishing ultraviolet and IR signals by switching its operating mode in the photo-/thermo-electric effect. The large optical band gap of ∼3.2 eV in MAPbCl ensures the response toward an ultraviolet photon, while its efficient thermoelectric effect allows the sensing of an IR signal. As a result, the detector exhibits a specific detectivity of 4.5 × 10 Jones for 395 nm ultraviolet photons under 0 V, while under the working voltage of 2.5 V, it demonstrates a superior temperature coefficient of resistance of -3.7% K, a specific detectivity of 4.8 × 10 Jones, and a limit of detection of 0.58 mW/cm for 4 μm photons. The functionality of the switching response to ultraviolet or IR photons by working voltage allows background subtraction and enhances the target discrimination in the imaging.
感知不可见紫外光子和红外辐射的组合，可通过弥补其自身在短传感范围内的局限性和较差的空间分辨率，显著增强目标识别能力。然而，它们波长的差异对传感材料和器件提出了独特要求，这使得难以在单个探测器中实现它们。在这项工作中，我们展示了一种采用CHNHPbCl（MAPbCl）的单探测器设计，通过在光/热电效应中切换其工作模式来区分紫外和红外信号。MAPbCl中约3.2 eV的大光学带隙确保了对紫外光子的响应，而其高效的热电效应则允许对红外信号进行传感。结果，该探测器在0 V时对395 nm紫外光子的比探测率为4.5×10琼斯，而在2.5 V的工作电压下，它表现出-3.7% K的优异电阻温度系数、4.8×10琼斯的比探测率以及对4μm光子0.58 mW/cm的探测极限。通过工作电压对紫外或红外光子进行切换响应的功能允许背景扣除，并增强成像中的目标辨别能力。
