期刊
ADVANCED MATERIALS
卷 33, 期 3, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.202005557
关键词
halide perovskites; narrowband photodetectors; self‐ driven photodetectors; tunable spectral response
类别
资金
- China Postdoctoral Science Foundation [2019M660291]
- Guangdong Basic and Applied Basic Research Foundation [2019A1515110434]
- National Natural Science Foundation of China [21905006, 21972006, 51773230]
- Shenzhen Peacock Plan [KQTD2016053015544057]
- Shenzhen & Hong Kong Joint Research Program [SGLH20180622092406130]
- Nanshan Pilot Plan [LHTD20170001]
A filterless and self-driven perovskite narrowband photodetector with tunable bandgap based on defect-assisted charge collection narrowing mechanism is reported in this study, showing wide spectral response range and excellent detection performance. It has the potential for high-efficiency optoelectronic devices without external power sources.
Narrowband photodetectors with tunable spectral responses are highly desirable for applications in image sensing, machine vision, and optical communication. Herein, a filterless and self-driven perovskite narrowband photodetector (PNPD) based on the defect-assisted charge collection narrowing (CCN) mechanism is reported, which is enabled by a high-quality thick perovskite film. By adjusting the halide component of the perovskite layer, the bandgap is successfully modulated and the corresponding narrowband photodetectors show a wide spectral response range from the red to the near-infrared (NIR), all with full-widths at half maximum (FWHMs) below 30 nm. Specifically, the methylammonium lead iodide (MAPbI(3)) narrowband photodetector exhibits a characteristic detection peak at 800 nm with a very low noise current of approximate to 0.02 pA Hz(-1/2), a high specific detectivity up to 1.27 x 10(12) Jones, and a fast response speed with rise/fall time of 12.7/6.9 mu s. Impressively, these values are among the highest of their kind reported previously, and allow demonstration of narrowband imaging. The excellent performance of self-driven PNPDs lights up their prospect in high-efficiency optoelectronic devices without external power sources.
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