Graphene quantum dot arrays: Pros and cons of photodetection in the Coulomb blockade regime

Abid,; Sehrawat, Poonam; Islam, S. S.

doi:10.1016/j.carbon.2019.04.082

Cited by 14 publications

(4 citation statements)

References 105 publications

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“…The dynamic photoresponse was distinctly observed with nearly ∼4 μA current for each cycle. It is well known that pure GQDs have low R − and are hence excluded from the comparison. Finally, we disperse the same volume (25 μL) of Au@GQDs on graphene for our optimized PD device.…”

Section: Resultsmentioning

confidence: 99%

Microplasma-Enabled Graphene Quantum Dot-Wrapped Gold Nanoparticles with Synergistic Enhancement for Broad Band Photodetection

Thakur¹,

Fang

Yang³

et al. 2020

ACS Appl. Mater. Interfaces

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Plasmonic nanostructure/semiconductor nanohybrids offer many opportunities for emerging electronic and optoelectronic device applications because of their unique geometries in the nanometer scale and material properties. However, the development of a simple and scalable synthesis of plasmonic nanostructure/semiconductor nanohybrids is still lacking. Here, we report a direct synthesis of colloidal gold nanoparticle/graphene quantum dot (Au@GQD) nanohybrids under ambient conditions using microplasmas and their application as photoabsorbers for broad band photodetectors (PDs). Due to the unique AuNP core and graphene shell nanostructures in the synthesized Au@GQD nanohybrids, the plasmonic absorption of the AuNP core extends the usable spectral range of the photodetectors. It is demonstrated that the Au@GQD-based visible light photodetector simultaneously possesses an extraordinary photoresponsivity of ∼10 3 A/W, ultrahigh detectivity of 10 13 Jones, and fast response time in the millisecond scale (65 ms rise time and 53 ms fall time). We suggest that the synergistic effect can be attributed to the strong fluorescence quenching in Au@GQD coupled with the two-dimensional graphene layer in the device. This work provides knowledge of tailoring the optical absorption in GQDs with plasmonic AuNPs and the corresponding photophysics for broad band response in PD-related devices.

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Section: Resultsmentioning

confidence: 99%

Microplasma-Enabled Graphene Quantum Dot-Wrapped Gold Nanoparticles with Synergistic Enhancement for Broad Band Photodetection

Thakur¹,

Fang

Yang³

et al. 2020

ACS Appl. Mater. Interfaces

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“…Resistive-type photodetector is widely used for research and development work and is expected to possess fast response, good accuracy, and high stability. − However, concerns such as rigidity, huge size, fragility, and the difficulty involved in fixing them to the curvilinear surface of test objects severely limit their applications. Carbon-derived photosensitive materials such as carbon black, reduced graphene oxide (RGO), , and carbon fiber and carbon nanotubes (CNTs) attract increasing consideration due to their remarkable mechanical, thermal, optical, and electrical properties. − Graphene, a monolayer of hexagonally arranged carbon atoms, is a favorable candidate for flexible photodetectors due to its exceptional properties including high carrier density and mobility, atomic layer thickness, very low weight, exceptional surface to volume ratio, and large absorption coefficient. − However, its zero band gap, low ON/OFF ratio, and wide spectral range mar the prospects of its photodetection applications . In addition, the complexities involved in manipulation and device fabrication from monolayer graphene propel the search for alternative solutions to overcome the limitations of graphene and render easy fabrication and efficient performance.…”

Section: Introductionmentioning

confidence: 99%

WS₂ Quantum Dots on e-Textile as a Wearable UV Photodetector: How Well Reduced Graphene Oxide Can Serve as a Carrier Transport Medium?

Abid

Sehrawat

Julien

et al. 2020

ACS Appl. Mater. Interfaces

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We document the fabrication and investigations of a novel photodetector based on a WS 2 quantum dots and reduced graphene oxide (RGO) (WS 2 -QDs/RGO) heterostructure. The proposed photodetector is simple, scalable, cost-effective, and flexible and works in an ambient environment. An enhanced photodetection efficiency is observed due to the superior electronic properties of WS 2 -QDs and excellent electrical as well as thermal properties of the carrier transportation medium, RGO. For device fabrication, GO and WS 2 -QDs were separately synthesized via different chemistry followed by decorating WS 2 -QDs on RGO coated cotton textile. Characterization studies confirm the transformation of exfoliated WS 2 -2D flakes into WS 2 -0D quantum dots and graphene oxide (GO) to RGO. The optimized photodetection performance of WS 2 -QDs/RGO demonstrates its photoresponsivity of 5.22 mA W −1 at 1.4 mW mm −2 power density of a 405 nm illumination source. Other sensor parameters such as photosensitivity (∼20.2%), resolution (∼0.031 mW mm −2 μA −1 ), response time (1.57 s), recovery time (1.83 s), and specific detectivity (∼1.6 × 10 6 jones) are found for WS 2 -QDs/RGO sensor, and a few of these parameters are comparable and even superior to some of the devices as reported. Photosensing mechanism is explained in terms of charge transfer caused by appropriate band alignment across the interface between WS 2 -QDs and RGO, where dimensionality and quantum confinement of nanostructures synergistically enhance the overall performance of the heterostructure. The device flexibility is examined through bending, stretching, and twisting experiments and successfully demonstrated its potentiality. Sensor performance even after being soaked in water and subsequent drying shows the possibility of reuse. The attributes of flexibility, high sensitivity and responsivity, superior resolution, and cost-effectiveness of our novel flexible photodetector indicate its promising potential for flexible and wearable optical detectors operating in UV band. Although negative photoconductance of the WS 2 -QDs/RGO sensor is a major cause for not allowing the sensor to show its best performance, a tradeoff is made with improved device design to qualify the expectations of being a competitive device, and this has been demonstrated with experimental facts.

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“…This is also due to the intrinsic properties of graphene; for example, light absorption in graphene causes a large change in electron temperature, making graphene suitable for hot-electron bolometers in the terahertz frequency range, as shown in figure 19(e). Recently, there has been much research interest and activities in the development of GQD-based photodetectors [559][560][561][562][563][564], especially in areas, such as the use of GQD composite materials, array-type photodetectors [565], broadband detection and terahertz detectors [566]. Table 3 provides a list of the recently developed GQD-based photodetectors and their performance indicators.…”

Section: Detector and Sensor Applicationsmentioning

confidence: 99%

Graphene quantum dots: preparations, properties, functionalizations and applications

Tian,

Tang,

Teng

et al. 2024

Mater. Futures

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Due to its zero-dimensional property, graphene quantum dots (GQDs) has quantum confinement effect on the internal charge, so they show many properties different from the parent two-dimensional graphene, such as strong fluorescence, non-zero band gap and easily soluble in solvents. As a member of the family of carbon materials, GQDs also has biocompatibility and low toxicity, which is one of the reasons why GQDs can be widely used in the biomedical field .The edge effect of GQDs is also particularly important. By modifying the edge of GQDs, the performance of GQDs can be regulated. A lot of preparation technology of GQDs, probably can be divided into three categories, and top-down, bottom-up and chemical method, chemical method is different from other literature classification, mainly considering the certain of the preparation of GQDs way, not directly to block materials or direct synthesis of small molecule materials for GQDs, but through intermediate in chemical means under the action of changes and form GQDs. The detailed introduction of the optical, electrical, thermal and magnetic properties of GQDs is the premise of the performance regulation of GQDs. In addition to inheriting the excellent properties of graphene, GQDs also expand the properties of the parent material. The functionalization of GQDs mainly includes the doping technology of introducing heteroatom and the composite technology of combining with other substances to improve the performance of other substances. The performance of these functionalized products is also discussed. The original and functionalized properties of GQDs are based on the application of GQDs. In recent years, GQDs has been used in many fields, including optics, electricity, optoelectronics, biomedicine, energy, agriculture and some emerging interdisciplinary fields. Through the introduction and discussion of the recent research achievements of GQDs, this review mainly highlights the huge potential value of GQDs and puts forward the direction of the development of GQDs in the future.

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Graphene quantum dot arrays: Pros and cons of photodetection in the Coulomb blockade regime

Cited by 14 publications

References 105 publications

Microplasma-Enabled Graphene Quantum Dot-Wrapped Gold Nanoparticles with Synergistic Enhancement for Broad Band Photodetection

Microplasma-Enabled Graphene Quantum Dot-Wrapped Gold Nanoparticles with Synergistic Enhancement for Broad Band Photodetection

WS₂ Quantum Dots on e-Textile as a Wearable UV Photodetector: How Well Reduced Graphene Oxide Can Serve as a Carrier Transport Medium?

Graphene quantum dots: preparations, properties, functionalizations and applications

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Graphene quantum dot arrays: Pros and cons of photodetection in the Coulomb blockade regime

Cited by 14 publications

References 105 publications

Microplasma-Enabled Graphene Quantum Dot-Wrapped Gold Nanoparticles with Synergistic Enhancement for Broad Band Photodetection

Microplasma-Enabled Graphene Quantum Dot-Wrapped Gold Nanoparticles with Synergistic Enhancement for Broad Band Photodetection

WS2 Quantum Dots on e-Textile as a Wearable UV Photodetector: How Well Reduced Graphene Oxide Can Serve as a Carrier Transport Medium?

Graphene quantum dots: preparations, properties, functionalizations and applications

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Product

Resources

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WS₂ Quantum Dots on e-Textile as a Wearable UV Photodetector: How Well Reduced Graphene Oxide Can Serve as a Carrier Transport Medium?