Vacuum ultraviolet excitation luminescence spectroscopy of few-layered MoS<sub>2</sub>

Pankratov, V.; Hoszowska, J.; Dousse, J.-Cl.; Huttula, Marko; Kis, András; Krasnozhon, Daria; Zhang, M; Cao, Wei

doi:10.1088/0953-8984/28/1/015301

Cited by 13 publications

(14 citation statements)

References 47 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This has been shown in the PDOS of two models where the MoS 2 side owns electronic structures similar to metals. Different from the structure of its semiconductive bulk counterpart in previous studies, the side surface of the MoS 2 has rich but not overlapped bands. Contact between the Ni metal and MoS 2 is metallic since significant electron state overlap was found, smearing the gap between conduction and valence bands and avoiding tunnel barriers.…”

Section: Discussioncontrasting

confidence: 73%

“…Thus, contact instability and Schottky barriers with high contact resistance limit the performance of ILC‐based devices . As an intensively studied host matrix, molybdenum disulfide (MoS 2 ) is a cheap and abundant mineral compared with other TMDs, and is found promising in applications of transistors, optoelectronics, catalytic reactions, and even UV–vis light convertors . It has also been proposed as an alternative to traditional silicon‐based semiconductors due to the high mobility and on/off current ratios .…”

Section: Introductionmentioning

confidence: 99%

“…Composed of intralayer transistors, [10,11] optoelectronics, [12] catalytic reactions, [13] and even UV-vis light convertors. [14] It has also been proposed as an alternative to traditional silicon-based semiconductors due to the high mobility and on/off current ratios. [15,16] Furthermore, it has certain photocatalytic abilities in degrading organic pollutants, [17] and the chemical robustness could be enhanced by proper materials engineering.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Metallic Contact between MoS₂ and Ni via Au Nanoglue

Shi

Posysaev

Huttula

et al. 2018

Small

View full text Add to dashboard Cite

A critical factor for electronics based on inorganic layered crystals stems from the electrical contact mode between the semiconducting crystals and the metal counterparts in the electric circuit. Here, a materials tailoring strategy via nanocomposite decoration is carried out to reach metallic contact between MoS matrix and transition metal nanoparticles. Nickel nanoparticles (NiNPs) are successfully joined to the sides of a layered MoS crystal through gold nanobuffers, forming semiconducting and magnetic NiNPs@MoS complexes. The intrinsic semiconducting property of MoS remains unchanged, and it can be lowered to only few layers. Chemical bonding of the Ni to the MoS host is verified by synchrotron radiation based photoemission electron microscopy, and further proved by first-principles calculations. Following the system's band alignment, new electron migration channels between metal and the semiconducting side contribute to the metallic contact mechanism, while semiconductor-metal heterojunctions enhance the photocatalytic ability.

show abstract

Section: Discussioncontrasting

confidence: 73%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Metallic Contact between MoS₂ and Ni via Au Nanoglue

Shi

Posysaev

Huttula

et al. 2018

Small

View full text Add to dashboard Cite

show abstract

“…Values for pristine layers were crosschecked with those given by the more precise and lengthy CASTEP package. It is worth mentioning that the validity of CASTEP was confirmed by experimental determination of the electronic structures and excitonic behaviors of the LTMD [30]. Thechemically robust clusters can bond to the low-dimensional ILCs, and bolster the complex stabilities.…”

Section: Introductionmentioning

confidence: 81%

“…shows that low-dimensional MoS2 is a good candidate for the ultrasensitive photodetector [29], and even applicable in detecting a UV photon by converting to visible emissions [30].…”

Section: Introductionmentioning

confidence: 99%

Introducing Magnetism into 2D Nonmagnetic Inorganic Layered Crystals: A Brief Review from First-Principles Aspects

et al. 2018

View full text Add to dashboard Cite

Pioneering explorations of the two-dimensional (2D) inorganic layered crystals (ILCs) in electronics have boosted low-dimensional materials research beyond the prototypical but semi-metallic graphene. Thanks to species variety and compositional richness, ILCs are further activated as hosting matrices to reach intrinsic magnetism due to their semiconductive natures. Herein, we briefly review the latest progresses of manipulation strategies that introduce magnetism into the nonmagnetic 2D and quasi-2D ILCs from the first-principles computational perspectives. The matrices are concerned within naturally occurring species such as MoS 2 , MoSe 2 , WS 2 , BN, and synthetic monolayers such as ZnO and g-C 2 N. Greater attention is spent on nondestructive routes through magnetic dopant adsorption; defect engineering; and a combination of doping-absorbing methods. Along with structural stability and electric uniqueness from hosts, tailored magnetic properties are successfully introduced to low-dimensional ILCs. Different from the three-dimensional (3D) bulk or zero-dimensional (0D) cluster cases, origins of magnetism in the 2D space move past most conventional physical models. Besides magnetic interactions, geometric symmetry contributes a non-negligible impact on the magnetic properties of ILCs, and surprisingly leads to broken symmetry for magnetism. At the end of the review, we also propose possible combination routes to create 2D ILC magnetic semiconductors, tentative theoretical models based on topology for mechanical interpretations, and next-step first-principles research within the domain.

show abstract

Emerging blue‐UV luminescence in cerium doped YAG nanocrystals

Shirmane

Pankratov

2016

Physica Rapid Research Ltrs

View full text Add to dashboard Cite

Time-resolved luminescence properties in of Ce 3+ doped Y 3 Al 5 O 12 (YAG) nanocrystals have been studied by means of vacuum-ultraviolet excitation spectroscopy. It was discovered that additionally to the regular Ce 3+ yellow-green emission which is well-known luminescence in YAG, new emission covering broad spectral range from 2.7 eV to 3.5 eV was revealed in the luminescence spectra for all YAG:Ce nanocrystals studied. This blue-UV emission has fast decay time about 7 ns as well as intensive well-resolved excitation band peaking at 5.9 eV and, in contrast to green Ce 3+ emission, practically is not excited at higher energies. The origin of the blue-UV emission is tentatively suggested and discussed.Copyright line will be provided by the publisher Bulk cerium doped Y 3 Al 5 O 12 (YAG:Ce) is an important and well-known luminescent material that had been studied more than 40 years. This compound became as one of the most popular materials among others because of its high radiation and chemical stability as well as efficient yellow-green luminescence [1, 2 and references therein]. Luminescent nanocrystals or nanophosphors (including YAG:Ce) recently received increased attention because of their potential application in medicine and biophysics (labeling, signaling, and biomedical purpose) [3]. Generally, nanophosphors of various inorganic compounds in form of nanopowders and nanoceramics have been successfully synthesized during the last decade all over the world thanks to rapidly developed nanotechnologies. It was reported that YAG:Ce nanopowders have been successfully synthesized by means of many technique, which include co-precipitation method [4], hydrothermal process [5], Pechini method [6], sol-gel method [7]. Resent researches of YAG:Ce are mostly focused on the synthesis, characterization and applications of YAG:Ce in form of nanopowders [8,9], nanoceramics [10-13] and single crystalline films [14,15].The main goal of the current investigation is a study of the luminescence properties of nanosized YAG:Ce under high energy excitations including vacuum ultraviolet (VUV) range, which is important for biolabelling, radiation therapy applications and scintillators. In our study we applied synchrotron radiation, which has significant advantages over the radiation of ordinary sources. The main advantages of synchrotron radiation is the extended wavelength range attained, that gives broad and continuous spectrum. In recent works it was shown how important is to use synchrotron radiation in investigation of optical and luminescence properties of wide band gap insulators [9,[16][17][18][19][20] as well as of nanocrystalline and two-dimensional semiconductors [21,22].The luminescence measurements was carried out using pulsed synchrotron radiation at the Superlumi station at Photon Science (DESY, Hamburg) [23]. Luminescence spectra in the UV and visible range were recorded with a spectrograph SpectraPro-308i (Acton Research Corporation) equipped with a photomultiplier (Hamamatsu R6358P). The spectral resolution of the...

show abstract

Vacuum ultraviolet excitation luminescence spectroscopy of few-layered MoS₂

Cited by 13 publications

References 47 publications

Metallic Contact between MoS₂ and Ni via Au Nanoglue

Metallic Contact between MoS₂ and Ni via Au Nanoglue

Introducing Magnetism into 2D Nonmagnetic Inorganic Layered Crystals: A Brief Review from First-Principles Aspects

Emerging blue‐UV luminescence in cerium doped YAG nanocrystals

Contact Info

Product

Resources

About

Vacuum ultraviolet excitation luminescence spectroscopy of few-layered MoS2

Cited by 13 publications

References 47 publications

Metallic Contact between MoS2 and Ni via Au Nanoglue

Metallic Contact between MoS2 and Ni via Au Nanoglue

Introducing Magnetism into 2D Nonmagnetic Inorganic Layered Crystals: A Brief Review from First-Principles Aspects

Emerging blue‐UV luminescence in cerium doped YAG nanocrystals

Contact Info

Product

Resources

About

Vacuum ultraviolet excitation luminescence spectroscopy of few-layered MoS₂

Metallic Contact between MoS₂ and Ni via Au Nanoglue

Metallic Contact between MoS₂ and Ni via Au Nanoglue