PbS Colloidal Quantum Dot Photodetectors operating in the near infrared

Iacovo, Andrea De; Venettacci, Carlo; Colace, Lorenzo; Scopa, L.; Foglia, Sabrina

doi:10.1038/srep37913

Cited by 124 publications

(91 citation statements)

References 31 publications

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“…Some studies have been done to fabricate different ZnO nanostructures for UV photodetectors and improve their performances [27,28]. However, the performances of single-layer devices are often affected by large dark currents, low on-off ratios, slow light responses and narrow spectral response range [29][30][31]. To overcome the drawbacks of the single-component nanomaterial devices, hybrid architecture or heterostructure (such as PbS QDs/organic hybrid structure and PbS QDs/1D or 2D inorganic nanostructure) have been developed to improve the performance of the photonic devices [32][33][34].…”

Section: Introductionmentioning

confidence: 99%

High-performance flexible and broadband photodetectors based on PbS quantum dots/ZnO nanoparticles heterostructure

et al. 2018

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Flexible and broadband photodetectors have drawn extensive attention due to their potential application in foldable displays, optical communications, environmental monitoring, etc. In this work, a flexible photodetector based on the crystalline PbS quantum dots (QDs)/ZnO nanoparticles (NPs) heterostructure was proposed. The photodetector exhibits a broadband response from ultraviolet-visible (UV-Vis) to near infrared detector (NIR) range with a remarkable current on/off ratio of 7.08×10 3 under 375 nm light illumination. Compared with pure ZnO NPs, the heterostructure photodetector shows the three orders of magnitude higher responsivity in Vis and NIR range, and maintains its performance in the UV range simultaneously. The photodetector demonstrates a high responsivity and detectivity of 4.54 A W −1 and 3.98×10 12 Jones. In addition, the flexible photodetectors exhibit excellent durability and stability even after hundreds of times bending. This work paves a promising way for constructing next-generation high-performance flexible and broadband optoelectronic devices.

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Section: Introductionmentioning

confidence: 99%

High-performance flexible and broadband photodetectors based on PbS quantum dots/ZnO nanoparticles heterostructure

et al. 2018

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“…Photodetectors based on single‐layer PbS QDs have been fabricated, and satisfactory responsivity ( R ) and detectivity ( D *) were achieved . However, the performances of the single‐layer devices are often shadowed by large dark currents, low on–off ratios, and slow light responses . To overcome the drawbacks of the single‐layer PbS QD devices, researchers have tried various methods: nanocrystals such as Ag or Au were introduced into the PbS film as traps to prolong photocarrier lifetime and hence enhance the photocurrent, but the introduced traps will slow down the response speed of the device.…”

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confidence: 99%

Bilayer PbS Quantum Dots for High‐Performance Photodetectors

et al. 2017

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Due to their wide tunable bandgaps, high absorption coefficients, easy solution processabilities, and high stabilities in air, lead sulfide (PbS) quantum dots (QDs) are increasingly regarded as promising material candidates for next-generation light, low-cost, and flexible photodetectors. Current single-layer PbS-QD photodetectors suffer from shortcomings of large dark currents, low on-off ratios, and slow light responses. Integration with metal nanoparticles, organics, and high-conducting graphene/nanotube to form hybrid PbS-QD devices are proved capable of enhancing photoresponsivity; but these approaches always bring in other problems that can severely hamper the improvement of the overall device performance. To overcome the hurdles current single-layer and hybrid PbS-QD photodetectors face, here a bilayer QD-only device is designed, which can be integrated on flexible polyimide substrate and significantly outperforms the conventional single-layer devices in response speed, detectivity, linear dynamic range, and signal-to-noise ratio, along with comparable responsivity. The results which are obtained here should be of great values in studying and designing advanced QD-based photodetectors for applications in future flexible optoelectronics.

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“…It is worth mentioning that the effective mass of electron and holes in QDs are almost similar with m e * ≈ m h * ≈ 0.08 0 , whereby m 0 is the electron mass in vacuum. This results eventually contributed to a strong confinement of both electrons and holes in the PbS QDs and benefit it potential in various optoelectronic application such as near infrared (NIR) photodetector, solar cell device, and light emitting diode (LED) (Guchhait 2011;Iacovo 2016;Reilly 2014;Zhou et al 2019). In addition, the size dependent optical absorption coefficient of QDs also allowed it to be used as a switchable device and ease the spectra modification in absorption, photoluminescence and electroluminescence spectra (Okamoto 2004).…”

Section: Introductionmentioning

confidence: 99%

Temperature and Power Dependence of Photoluminescence in PBS Quantum Dots Nanoparticles

Zaini¹,

Kamarudin²,

Liew³

et al. 2019

JSM

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In this study, the synthesis and the effect of temperature and power excitation towards photoluminescence (PL) emission of colloidal PbS quantum dots (QDs) were reported. Water soluble PbS QDs capped with a mixture of 1-thioglycerol (TGL) and dithioglycerol (DTG) was synthesized via colloidal chemistry method at room temperature. The PL emission of PbS QDs was investigated under temperature range from 10 K to 300 K and we found that the PL emission blue-shifted when the temperature is increased. From high resolution transmission electron microscopy (HRTEM), the average size of PbS core QDs is determined to be 6 nm and the integrated PL intensity (IPL) versus excitation power density shows the recombination of electrons and holes occur efficiently at low and high temperature for the PbS QDs. Full width half maximum (FWHM) shows a gradual broadening with the increasing temperature due to the interaction of charge carriers with phonons.

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PbS Colloidal Quantum Dot Photodetectors operating in the near infrared

Cited by 124 publications

References 31 publications

High-performance flexible and broadband photodetectors based on PbS quantum dots/ZnO nanoparticles heterostructure

High-performance flexible and broadband photodetectors based on PbS quantum dots/ZnO nanoparticles heterostructure

Bilayer PbS Quantum Dots for High‐Performance Photodetectors

Temperature and Power Dependence of Photoluminescence in PBS Quantum Dots Nanoparticles

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