Issue 39, 2020

Sensitively switchable visible/infrared multispectral detection and imaging based on a tandem perovskite device

Abstract

Multispectral detection and imaging facilitate advances in target identification; for example, the switchable functionality of sensing visible photons and sensing near-infrared photons in the eyes of some vertebrate species provide visual sensitivity beyond the range of human vision. In this work, a single sensor device is constructed with stacking solution-processed MAPbI3 and MA0.5FA0.5Pb0.5Sn0.5I3 in opposite polarity for the multispectral detection of visible and NIR photons. With applied bias modulating built-in potential, the sensing response is tunable, while the good ambipolar carrier transport and high trap tolerance in perovskite films ensure high performance. As a result, the selective sensing toward visible photons from 350–800 nm and NIR photons from 700–1000 nm is achieved in a single photodetector under −0.3V and 0.5 V, respectively, with a high on/off ratio of ∼104, a relatively low optical crosstalk of −70 dB, and specific detectivity of over 1012 Jones. Moreover, the high mode-switching rate of 1000 Hz in altering the visible and NIR sensing mode and the high −3 dB bandwidth of ∼50 kHz enable our solution-processed perovskite-based multispectral photodetector to be recognized as an advanced technique for the fast and sensitive target multispectral imaging and identification.

Graphical abstract: Sensitively switchable visible/infrared multispectral detection and imaging based on a tandem perovskite device

Supplementary files

Article information

Article type
Paper
Submitted
02 Jul 2020
Accepted
19 Sep 2020
First published
21 Sep 2020

Nanoscale, 2020,12, 20386-20395

Sensitively switchable visible/infrared multispectral detection and imaging based on a tandem perovskite device

J. Liu, Y. Zou, B. Huang, Y. Gu, Y. Yang, Z. Han, Y. Zhang, X. Xu and H. Zeng, Nanoscale, 2020, 12, 20386 DOI: 10.1039/D0NR04974C

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