Growth and photoluminescence of oriented MoSe<sub>2</sub>nanosheets produced by hot filament CVD

Wang, B. B.; Ostrikov, Kostya Ken; Laan, Timothy van der; Zheng, Kun; Shao, Ruiwen; Zhu, Mankang; Zou, S. S.

doi:10.1039/c6ra05737c

Cited by 25 publications

(10 citation statements)

References 50 publications

(64 reference statements)

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“…, Mo 5+ and Mo 6+ ) . The peaks located at ∼54.9 and ∼55.7 eV in the Se 3d spectra are ascribed to the Se 3d 5/2 and Se 3d 3/2 peaks of the diselenide moiety of MoSe 2, respectively. , For the samples exfoliated with H 2 O 2 , the additional peaks at higher binding energy are ascribed to the oxidized forms of Se (Se 4+ and Se 6+ ) . A further Se component was present in all the samples, in a position consistent with Se 0 …”

Section: Resultsmentioning

confidence: 80%

Carbon Nanotube-Supported MoSe₂ Holey Flake:Mo₂C Ball Hybrids for Bifunctional pH-Universal Water Splitting

et al. 2019

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The design of cost-effective and efficient electrocatalysts for both hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) is pivotal for the molecular hydrogen (H2) production from electrochemical water splitting as a future energy source. Herein, we show that the hybridization between multiple HER- and OER-active components is effective for the design and realization of bifunctional electrocatalysts for universal water splitting, i.e., in both acidic and alkaline media. Our strategy relies on the production and characterization of MoSe2 holey flake:Mo2C ball hybrids supported by single-walled carbon nanotube (SWCNT) electrocatalysts. Flakes of MoSe2 are produced through hydrogen peroxide (H2O2)-aided liquid phase exfoliation (LPE), which promotes both the exfoliation of the materials and the formation of nanopores in the flakes via chemical etching. The amount of H2O2 in the solvent used for the exfoliation process is optimized to obtain ideal high ratio between edge and basal sites ratio, i.e., high-number of electrocatalytic sites. The hybridization of MoSe2 flakes with commercial ball-like shaped Mo2C crystals facilitates the Volmer reaction, which works in both acidic and alkaline media. In addition, the electrochemical coupling between SWCNTs (as support) and MoSe2:Mo2C hybrids synergistically enhances both HER- and OER-activity of the native components, reaching high η10 in acidic and alkaline media (0.049 and 0.089 V for HER in 0.5 M H2SO4 and 1 M KOH, respectively; 0.197 and 0.241 V for OER in 0.5 M H2SO4 and 1 M KOH, respectively). The exploitation of the synergistic effects occurring between multicomponent electrocatalysts, coupled with the production of the electrocatalysts themselves through scalable and cost-effective solution-processed manufacturing techniques, is promising to scale-up the production of H2 via efficient water splitting for the future energy portfolio.

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Section: Resultsmentioning

confidence: 80%

Carbon Nanotube-Supported MoSe₂ Holey Flake:Mo₂C Ball Hybrids for Bifunctional pH-Universal Water Splitting

et al. 2019

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“…An extra peak at 37 • generated due to PID effect corresponds to the formation of MoSe 2 under the presence of Na ions. [25,26] Various reports suggest the formation of MoSe 2 layers between CIGS and Mo due to the presence of Na. [26][27][28] In addition, change in intensities have been observed for PID treated samples.…”

Section: Crystallographic Analysis Of Pid Affected Cellsmentioning

confidence: 99%

Unraveling the cause of degradation in Cu(In,Ga)Se₂ photovoltaics under potential induced degradation

et al. 2021

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Copper indium gallium diselenide (CIGS) based technology is actively competing in the global photovoltaic market with high conversion efficiency. Commercial CIGS modules are anticipated to perform on rated output in the field condition for 20 years. Potential induced degradation (PID) is considered as one of the critical concerns among all the current reliability assessment issues. PID accelerated tests have been performed on pre-commercial CIGS modules to investigate reduction in electrical performance. We report the severe reduction in electrical performance after PID is correlated to the microstructural and chemical properties of the constituent materials. Under extreme PID stress, the cell surface reveals various defects including crater formation. The aim of this article is to explore the consequences of PID induced craters on the efficiency of CIGS solar cells by investigating material degradation kinetics. In this perspective, we present the root cause of PID in CIGS thin-film modules in relation to microstructural defects by detailed investigation using J-V analysis, field emission scanning electron microscope (FESEM), Raman spectroscopy, X-Ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and photoluminescence spectroscopy (PL). This analysis can provide more effective and sustainable research strategies to cultivate more efficient and reliable CIGS technologies in the long run.

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“…At monolayer thickness, TMDs can exhibit direct electronic and optical bandgaps ranging from the visible to the near-infrared. Optical spectroscopy techniques such as photoluminescence (PL) and Raman are currently the key methods used in studying TMD properties such as bandgap energy, [15,16] emission efficiency, [17][18][19] and defect density [19][20][21]. However, PL and Raman spectroscopies have limited quantum efficiency, making them unfit for high-throughput applications.…”

Section: Case Study 1 Transmission Characterization Of 2d Transitionmentioning

confidence: 99%

Micro-Extinction Spectroscopy (MExS): a versatile optical characterization technique

Kumar

Villarreal

Zhang

et al. 2018

Adv Struct Chem Imag

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Micro-Extinction Spectroscopy (MExS), a flexible, optical, and spatial-scanning hyperspectral technique, has been developed and is described with examples. Software and hardware capabilities are described in detail, including transmission, reflectance, and scattering measurements. Each capability is demonstrated through a case study of nanomaterial characterization, i.e., transmission of transition metal dichalcogenides revealing transition energy and efficiency, reflectance of transition metal dichalcogenides grown on nontransparent substrates identifying the presence of monolayer following electrochemical ablation, and scattering to study single plasmonic nanoparticles and obtain values for the refractive index sensitivity and sensing figure of merit of over a hundred single particles with various shapes and sizes. With the growing integration of nanotechnology in many areas, MExS can be a powerful tool to both characterize and test nanomaterials.

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Growth and photoluminescence of oriented MoSe₂nanosheets produced by hot filament CVD

Abstract: Oriented MoSe2nanosheets with varying layers and structures were synthesized on silicon substrates by hot filament chemical vapour deposition in a nitrogen environment using MoO3and Se powders as precursors.

Cited by 25 publications

References 50 publications

Carbon Nanotube-Supported MoSe₂ Holey Flake:Mo₂C Ball Hybrids for Bifunctional pH-Universal Water Splitting

Carbon Nanotube-Supported MoSe₂ Holey Flake:Mo₂C Ball Hybrids for Bifunctional pH-Universal Water Splitting

Unraveling the cause of degradation in Cu(In,Ga)Se₂ photovoltaics under potential induced degradation

Micro-Extinction Spectroscopy (MExS): a versatile optical characterization technique

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Growth and photoluminescence of oriented MoSe2nanosheets produced by hot filament CVD

Abstract: Oriented MoSe2nanosheets with varying layers and structures were synthesized on silicon substrates by hot filament chemical vapour deposition in a nitrogen environment using MoO3and Se powders as precursors.

Cited by 25 publications

References 50 publications

Carbon Nanotube-Supported MoSe2 Holey Flake:Mo2C Ball Hybrids for Bifunctional pH-Universal Water Splitting

Carbon Nanotube-Supported MoSe2 Holey Flake:Mo2C Ball Hybrids for Bifunctional pH-Universal Water Splitting

Unraveling the cause of degradation in Cu(In,Ga)Se2 photovoltaics under potential induced degradation

Micro-Extinction Spectroscopy (MExS): a versatile optical characterization technique

Contact Info

Product

Resources

About

Growth and photoluminescence of oriented MoSe₂nanosheets produced by hot filament CVD

Carbon Nanotube-Supported MoSe₂ Holey Flake:Mo₂C Ball Hybrids for Bifunctional pH-Universal Water Splitting

Carbon Nanotube-Supported MoSe₂ Holey Flake:Mo₂C Ball Hybrids for Bifunctional pH-Universal Water Splitting

Unraveling the cause of degradation in Cu(In,Ga)Se₂ photovoltaics under potential induced degradation