Fast Uncooled Mid-Wavelength Infrared Photodetectors with Heterostructures of Van Der Waals on Epitaxial HgCdTe.
Advanced materials(2021)
摘要
Uncooled infrared photodetectors have evoked widespread interest in basic research and military manufacturing because of their low-cost, compact detection systems. However, existing uncooled infrared photodetectors utilize the photothermoelectric effect of infrared radiation operating at 8-12 mu m, with a slow response time in the millisecond range. Hence, the exploration of new uncooled mid-wavelength infrared (MWIR) heterostructures is conducive to the development of ultrafast and high-performance nano-optoelectronics. This study explores a van der Waals heterojunction on epitaxial HgCdTe (vdWs-on-MCT) as an uncooled MWIR photodetector, which achieves fast response as well as high detectivity for spectral blackbody detection. Specifically, the vdWs-on-MCT photodetector has a fast response time of 13 ns (77 MHz), which is approximately an order of magnitude faster than commercial uncooled MCT photovoltaic photodetectors. Importantly, the device exhibits a photoresponsivity of 2.5 A W-1, quantum efficiency as high as 85%, peak detectivity of 2 x 10(10) cm Hz(1/2) W-1 under blackbody radiation at room temperature, and peak detectivity of up to 10(11) cm Hz(1/2) W-1 at 77 K. Thereby, this work facilitates the effective design of high-speed and high-performance heterojunction uncooled MWIR photodetectors.
更多查看译文
关键词
mid-wavelength infrared photodetectors,photovoltaic effect,uncooled infrared photodetectors,vdWs-on-MCT
AI 理解论文
溯源树
样例
生成溯源树,研究论文发展脉络
Chat Paper
正在生成论文摘要