光电探测器
材料科学
光电子学
带隙
窄带
吸收(声学)
钙钛矿(结构)
宽带
光学
载流子
物理
化学工程
工程类
复合材料
作者
Jian Wang,Xiuwen Xu,Shuang Xiao,Yu Liu,Wei Qian,Jun Yu,Kai Zhang,Shihe Yang
标识
DOI:10.1002/adom.202100517
摘要
Abstract New mechanisms and modalities for multiband light detection are highly desirable for the ever‐growing developments in machine vision technologies. Demonstrated here is a unique talent of halide perovskites for making self‐driven dual‐band photodetectors with a negative broadband response in the above‐bandgap absorption region and a positive narrowband response in the sub‐bandgap absorption region. The device operates through a charge separation reversion mechanism by controlling the built‐in electric field and the thickness‐dependent light absorption profile in the active material. Impressively, the demarcation wavelengths between the negative broadband and the positive narrowband responses can be continuously adjusted, with the positive narrowband response easily tuned from 410 to 675 nm. The dual‐band photodetector exhibits an extremely low noise of 10 −15 A Hz −1/2 and a high specific detectivity of >10 12 Jones in both above‐bandgap and sub‐bandgap absorption regions, opening up application opportunities in intelligent recognition and biomedical diagnosis.
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