Synergetic photoluminescence enhancement of monolayer MoS<sub>2</sub><i>via</i> surface plasmon resonance and defect repair

Zeng, Yi; Chen, Weibing; Tang, Bin; Liao, Jianhui; Chen, Qing

doi:10.1039/c8ra03779e

Cited by 10 publications

(9 citation statements)

References 52 publications

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“…The PL spectra on the Si/SiO 2 substrate are in agreement with previous reports ( 21 , 27 ) and show similar line shapes with ~30-meV separation between the PL peaks of neutral excitons and trions, indicating similar values of the binding energies on both substrates. The relative blue shift of ~10 nm on the Au substrate compared to the Si/SiO 2 substrate may be due to the combination of surface plasmonic effects ( 10 , 21 , 28 ), and the release of strain in chemical vapor deposition (CVD)–grown WS 2 may be due to the transfer on Au ( 25 , 26 ).…”

Section: Resultsmentioning

confidence: 99%

Quantum plasmonic control of trions in a picocavity with monolayer WS ₂

Han

Yuan

et al. 2019

Sci. Adv.

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Monitoring and controlling the neutral and charged excitons (trions) in two-dimensional (2D) materials are essential for the development of high-performance devices. However, nanoscale control is challenging because of diffraction-limited spatial resolution of conventional far-field techniques. Here, we extend the classical tip-enhanced photoluminescence based on tip-substrate nanocavity to quantum regime and demonstrate controlled nano-optical imaging, namely, tip-enhanced quantum plasmonics. In addition to improving the spatial resolution, we use the scanning probe to control the optoelectronic response of monolayer WS2 by varying the neutral/charged exciton ratio via charge tunneling in Au-Ag picocavity. We observe trion “hot spots” generated by varying the picometer-scale probe-sample distance and show the effects of weak and strong coupling, which depend on the spatial location. Our experimental results are in agreement with simulations and open an unprecedented view of a new range of quantum plasmonic phenomena with 2D materials that will help to design new quantum optoelectronic devices.

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Section: Resultsmentioning

confidence: 99%

Quantum plasmonic control of trions in a picocavity with monolayer WS ₂

Han

Yuan

et al. 2019

Sci. Adv.

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“…Figure a shows typical curve-fits to these samples, where the excitons and trions are labeled. For comparison, we also performed an extensive analysis on the line width of 2D-MoS 2 samples fabricated on Si/SiO 2 by various other techniques reported in literature. ,,,,− Analyses were performed either using the published numerical data in articles or by digitizing the PL data from the published images within these articles. Curve-fitting was performed using Lorentzian functions in the same way we did for our samples.…”

Section: Resultsmentioning

confidence: 64%

MoS₂ Nanosheets with Narrowest Excitonic Line Widths Grown by Flow-Less Direct Heating of Bulk Powders: Implications for Sensing and Detection

Hejazi

Tan

Rezapour

et al. 2021

ACS Appl. Nano Mater.

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Developing techniques for high-quality synthesis of mono and few-layered 2D materials with lowered complexity and cost continues to remain an important goal, both for accelerating fundamental research and for applications development. We present the simplest conceivable technique to synthesize micrometerscale single-crystal triangular monolayers of MoS 2 , i.e. by direct heating of bulk MoS 2 powder onto proximally-placed substrates. Room-temperature excitonic linewidth values of our samples are narrower and more uniform than those of 2D-MoS 2 obtained by most other techniques reported in literature, and comparable to those of ultraflat h-BN-capped mechanically exfoliated samples, indicative of their high quality. Feature-rich Raman spectra absent in samples grown or obtained by most other techniques, also stand out as a testament of the high quality of our samples. A contact-growth mode facilitates direct growth of crystallographically-strained circular samples, which allows us to directly compare the optoelectronic properties of flat vs. strained growth from the same growth runs. Our method allows, for the first time, to quantitatively compare the impact of strain on excitonic and Raman peak positions on identicallysynthesized 2D-MoS 2 . Strain leads to average Red-shifts of ~ 30 meV in the A-exciton position, and ~ 2 cm -1 in the E 1 2g Raman peak in these samples. Our findings open-up several new possibilities that expand 2D material research. By eliminating the need for carrier gas flow, mechanical motion or chemical reactions, our method can be either miniaturized for substantially low-cost, high-quality scientific research or potentially scaled-up for mass-production of 2D crystals for commercial purposes. Moreover, we believe this technique can also be extended to other transition metal dichalcogenides and other layered materials.

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“…Although TMDs show potential for optoelectronic applications, their photoluminescence quantum yield (PL QY) is rather low. Therefore, defect engineering, oxygen bonding, and chemical doping are some of the strategies that have been used to increase the PL QY in MoS 2 thin films. − Amani et al chemically treated exfoliated monolayer MoS 2 with organic superacid bis(trifluoromethane)sulfonimide (TFSI), and reported a dramatic 95% increase in PL QY yield of monolayer MoS 2 . The PL peak intensity of monolayer MoS 2 increased 190-fold after TFSI chemical treatment, compared to exfoliated pristine monolayer MOS 2 .…”

Section: Mos2-based Wearable Oled Displaysmentioning

confidence: 99%

Flexible Molybdenum Disulfide (MoS₂) Atomic Layers for Wearable Electronics and Optoelectronics

Singh

Kim

et al. 2019

ACS Appl. Mater. Interfaces

318

219

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Flexible, stretchable, and bendable materials, including inorganic semiconductors, organic polymers, graphene, and transition metal dichalcogenides (TMDs), are attracting great attention in such areas as wearable electronics, biomedical technologies, foldable displays, and wearable point-of-care biosensors for healthcare. Among a broad range of layered TMDs, atomically thin layered molybdenum disulfide (MoS 2 ) has been of particular interest, due to its exceptional electronic properties, including tunable bandgap and charge carrier mobility. MoS 2 atomic layers can be used as a channel or a gate dielectric for fabricating atomically thin field-effect transistors (FETs) for electronic and optoelectronic devices. This review briefly introduces the processing and spectroscopic characterization of large-area MoS 2 atomically thin layers. The review summarizes the different strategies in enhancing the charge carrier mobility and switching speed of MoS 2 FETs by integrating high-κ dielectrics, encapsulating layers, and other 2D van der Waals layered materials into flexible MoS 2 device structures. The photoluminescence (PL) of MoS 2 atomic layers has, after chemical treatment, been dramatically improved to near-unity quantum yield. Ultraflexible and wearable active-matrix organic light-emitting diode (AM-OLED) displays and wafer-scale flexible resistive random-access memory (RRAM) arrays have been assembled using flexible MoS 2 transistors. The review discusses the overall recent progress made in developing MoS 2 based flexible FETs, OLED displays, nonvolatile memory (NVM) devices, piezoelectric nanogenerators (PNGs), and sensors for wearable electronic and optoelectronic devices. Finally, it outlines the perspectives and tremendous opportunities offered by a large family of atomically thin-layered TMDs. KEYWORDS: molybdenum disulfide (MoS 2 ), flexible electronics, flexible field-effect transistors (FETs), wearable organic light-emitting diode (OLED), flexible memory devices, flexible piezoelectric nanogenerators (PNGs), sensors

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Synergetic photoluminescence enhancement of monolayer MoS₂via surface plasmon resonance and defect repair

Cited by 10 publications

References 52 publications

Quantum plasmonic control of trions in a picocavity with monolayer WS ₂

Quantum plasmonic control of trions in a picocavity with monolayer WS ₂

MoS₂ Nanosheets with Narrowest Excitonic Line Widths Grown by Flow-Less Direct Heating of Bulk Powders: Implications for Sensing and Detection

Flexible Molybdenum Disulfide (MoS₂) Atomic Layers for Wearable Electronics and Optoelectronics

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Synergetic photoluminescence enhancement of monolayer MoS2via surface plasmon resonance and defect repair

Cited by 10 publications

References 52 publications

Quantum plasmonic control of trions in a picocavity with monolayer WS 2

Quantum plasmonic control of trions in a picocavity with monolayer WS 2

MoS2 Nanosheets with Narrowest Excitonic Line Widths Grown by Flow-Less Direct Heating of Bulk Powders: Implications for Sensing and Detection

Flexible Molybdenum Disulfide (MoS2) Atomic Layers for Wearable Electronics and Optoelectronics

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About

Synergetic photoluminescence enhancement of monolayer MoS₂via surface plasmon resonance and defect repair

Quantum plasmonic control of trions in a picocavity with monolayer WS ₂

Quantum plasmonic control of trions in a picocavity with monolayer WS ₂

MoS₂ Nanosheets with Narrowest Excitonic Line Widths Grown by Flow-Less Direct Heating of Bulk Powders: Implications for Sensing and Detection

Flexible Molybdenum Disulfide (MoS₂) Atomic Layers for Wearable Electronics and Optoelectronics