Broadband, sensitive and spectrally distinctive SnS2 nanosheet/PbS colloidal quantum dot hybrid photodetector

Light, Science & Applications
Liang GaoJiang Tang

Abstract

Photodetectors convert photons into current or voltage outputs and are thus widely used for spectroscopy, imaging and sensing. Traditional photodetectors generally show a consistent-polarity response to incident photons within their broadband responsive spectrum. Here we introduced a new type of photodetector employing SnS2 nanosheets sensitized with PbS colloidal quantum dots (CQDs) that are not only sensitive (~105 A W-1) and broadband (300-1000 nm) but also spectrally distinctive, that is, show distinctive (positive or negative) photoresponse toward incident photons of different wavelengths. A careful mechanism study revealed illumination-modulated Schottky contacts between SnS2 nanosheets and Au electrodes, altering the photoresponse polarity toward incident photons of different wavelengths. Finally, we applied our SnS2 nanosheet/PbS CQDs hybrid photodetector to differentiate the color temperature of emission from a series of white light-emitting diodes (LEDs), showcasing the unique application of our novel photodetectors.

References

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Citations

May 22, 2019·Small·Fakun WangTianyou Zhai
Nov 23, 2019·Physical Chemistry Chemical Physics : PCCP·Batjargal SainbilegMichitoshi Hayashi
Jan 23, 2020·Nanomaterials·Tom NakotteJeff Pietryga
Sep 16, 2020·Analytical Methods : Advancing Methods and Applications·Zhijun GuoHansong Yu
Oct 13, 2020·Light, Science & Applications·Jiayue HanJun Wang
Dec 10, 2016·ACS Applied Materials & Interfaces·Huajing FangQingfeng Yan

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Methods Mentioned

BETA
atomic force microscopy
scanning electron microscopy

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