Wuhan National Laboratory for Optoelectronics (WNLO) and School of Optical and Electronic Information, Huazhong University of Science and Technology (HUST), Wuhan 430074, China
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 SnS
2
nanosheets sensitized with PbS colloidal quantum dots (CQDs) that are not only sensitive (~10
5
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 SnS
2
nanosheets and Au electrodes
altering the photoresponse polarity toward incident photons of different wavelengths. Finally
we applied our SnS
2
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.
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