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

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.

Multilayered PdSe2/Perovskite Schottky Junction for Fast, Self‐Powered, Polarization‐Sensitive, Broadband Photodetectors, and Image Sensor Application

“…Figure 5c shows the normalized response versus input pulsed frequency, from which the 3 dB bandwidth of the Schottky junction device is estimated to be ≈20.1 kHz. Such 3 dB frequency is much higher than that of SnS 2 /PbS hybrid detector (≈50 Hz), [56] and PtSe 2 / CdTe (≈6.2 kHz), [57] but slightly lower than that of Sn-containing perovskite NIR photodetector (≈100 kHz). [58] Table 1 summarizes the main device parameters of the PdSe 2 /perovskite detector and other devices with similar configurations.…”

Broadband, Ultrafast, Self‐Driven Photodetector Based on Cs‐Doped FAPbI3 Perovskite Thin Film

“…It has attracted increasing research interest recently owing to its promising application in safety monitoring, spatial optical communication, chemical/biological imaging, and light vision . Hitherto, tremendous efforts have been devoted to the design of wide broadband light harvesting structures through the combination of different functional materials . However, the fabrication methods are usually complicated or employing expensive instruments.…”

Large-size and high performance visible-light photodetectors based on two-dimensional hybrid materials SnS/RGO

“…[3][4][5] Therefore numerous attempts have been made to combine these 2D nanosheets with semiconductor nanostructures, this kind of hybrid photodetectors achieves ultrahigh responsivity due to the synergism between the strong absorption of semiconducting nanostructures and the extremely fast conduction of carriers within the 2D nanosheets. [6][7][8][9] These hybrid photodetectors, such as graphene/PbS, 6 graphene/ZnO, 7 MoS 2 /PbS, 8 SnS 2 /PbS 9 et al have already demonstrated outstanding performance. Unfortunately, all of them are on the micron scales and the fabrication must undergo extremely complex and precise processes for example, 2D nanosheets synthesized by chemical vapour deposition must transfer onto substrates, 2D nanosheets prepared by exfoliation are all on the micron scales, and photodetectors with micro-size channel length which assembled on substrates must use photolithography, all of which are unt for large-size device fabrication.…”