Excitonic absorption and defect-related emission in three-dimensional MoS<sub>2</sub> pyramids

Negri, Mario; Francaviglia, Luca; Kaplan, Daniel; Swaminathan, V.; Salviati, G.; Morral, Anna Fontcuberta i; Fabbri, Filippo

doi:10.1039/d1nr06041d

Cited by 5 publications

(4 citation statements)

References 56 publications

(75 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In addition, the ratio between the MoS2 mode intensity and the silicon peak confirms the bulk nature of the pyramid. It is worth noting that the E2g/A1g intensity ratio can give additional insights" (Negri et al, 2022). From the Figures 7 and 8, we can see the very good agreement between the data and the fitted curves.…”

Section: Polytypismsupporting

confidence: 56%

Molybdenum Disulfide MoS2 and the q-BWF line shapes (Raman Spectroscopy)

Sparavigna

2024

Preprint

View full text Add to dashboard Cite

RRUFF database is proposing the Raman spectra of two molybdenum disulfide MoS_2 samples. Here we show the q-BWF fitted functions to the E_2g and A_1g Raman bands of these samples. The q-BWF functions are generalizing the Breit-Wigner-Fano line shape in the framework of the q-exponential function proposed by Constantino Tsallis and his statistics. The fitted q-BWF functions to pyramid and monolayer Raman spectra by Fabbri et al., 2022, are also proposed. Some review of Raman spectroscopy of MoS_2 is proposed too, especially about Fano-Raman and Davydov splitting effect.

show abstract

Section: Polytypismsupporting

confidence: 56%

Molybdenum Disulfide MoS2 and the q-BWF line shapes (Raman Spectroscopy)

Sparavigna

2024

Preprint

View full text Add to dashboard Cite

show abstract

“…It is worth noting that the E2g/A1g intensity ratio can give additional insights" (Negri et al, 2022). From the Figures 7 and 8, we can see the very good agreement between the data and the fitted curves.…”

Section: Polytypismsupporting

confidence: 56%

Molybdenum Disulfide MoS2 and the q-BWF line shapes (Raman Spectroscopy)

Sparavigna

2024

Preprint

View full text Add to dashboard Cite

show abstract

“…For instance, pyramidal MoS 2 structures [76] show sophisticated helical electrical current flow [77] and, additionally, high energy harvesting capabilities through an electrocatalytic hydrogen evolution reaction [78]. Among the TMDC clusters with similar 3D geometry, altered optical, magnetic, catalytic, and electrical properties were also found for MoS 2 (strong excitonic absorption and cathodoluminescence [79]), WS 2 (complex Raman spectrum [80], non-linear optical response, and catalytic activity [81,82]), WSe 2 [83,84] (plasmonic effects), and in anti-pyramidal MoS 2 /WS 2 vertical heterostructures [58] prepared via a VLS growth process.…”

Section: Metatungstate Methods For Wse2 Deposition On Si/sio2mentioning

confidence: 99%

Metatungstate Chemical Vapor Deposition of WSe2: Substrate Effects, Shapes, and Morphologies

Buchkov,

Rafailov,

Minev

et al. 2024

Crystals

View full text Add to dashboard Cite

Owing to their exceptional properties, which are usually determined by the growth conditions, 2D transition metal dichalcogenides (TMDCs) offer numerous research directions for applications in the fields of spintronics, valleytronics, and optoelectronics. Here, we focus on the chemical vapor deposition (CVD) synthesis of WSe2 (tungsten diselenide) nanoclusters/nanoflakes by using a liquid precursor for tungsten (ammonium metatungstate) on Si/SiO2, fused silica, and sapphire substrates. Various WSe2 clusters with different sizes, thicknesses, and geometries were analyzed by means of optical and atomic force microscopy (AFM) and Raman spectroscopy. The observed structures were mostly WSe2 multilayers; however, monolayer formations were also found. They showed significant morphological differences, as well as wide nucleation density and size variations, possibly related to precursor/substrate surface interactions under the same CVD synthesis conditions. The largest WSe2 domains with a lateral size of up to hundreds of micrometers were observed on sapphire, probably caused by a higher growth rate of singular nucleation sites. WSe2 domains with irregular and triangular shapes were simultaneously identified on fused silica, whereas multilayered pyramidal WSe2 structures dominated in the case of Si/SiO2 substrates. The application of polarized Raman spectroscopy to precisely determine and differentiate the characteristic vibrational modes (A1g, E2g, and 2LA(M)) enabled the unambiguous identification of 2D and/or multilayered WSe2 formations with a high crystallinity level. The presented comparative analysis of samples prepared in relatively simple synthesis conditions (moderate working temperatures and ambient pressure) provides a base for further progress of the facile metatungstate CVD method and relevant opportunities for the exploration of 2D TMDC materials.

show abstract

Excitonic absorption and defect-related emission in three-dimensional MoS₂ pyramids

Abstract: In this work, we study the excitonic absorption and cathodoluminescence emission of MoS2 micro-pyramids grown by chemical vapor deposition on SiO2 substrates, obtained at room and cryogenic temperatures.

Cited by 5 publications

References 56 publications

Molybdenum Disulfide MoS2 and the q-BWF line shapes (Raman Spectroscopy)

Molybdenum Disulfide MoS2 and the q-BWF line shapes (Raman Spectroscopy)

Molybdenum Disulfide MoS2 and the q-BWF line shapes (Raman Spectroscopy)

Metatungstate Chemical Vapor Deposition of WSe2: Substrate Effects, Shapes, and Morphologies

Contact Info

Product

Resources

About

Excitonic absorption and defect-related emission in three-dimensional MoS2 pyramids

Abstract: In this work, we study the excitonic absorption and cathodoluminescence emission of MoS2 micro-pyramids grown by chemical vapor deposition on SiO2 substrates, obtained at room and cryogenic temperatures.

Cited by 5 publications

References 56 publications

Molybdenum Disulfide MoS2 and the q-BWF line shapes (Raman Spectroscopy)

Molybdenum Disulfide MoS2 and the q-BWF line shapes (Raman Spectroscopy)

Molybdenum Disulfide MoS2 and the q-BWF line shapes (Raman Spectroscopy)

Metatungstate Chemical Vapor Deposition of WSe2: Substrate Effects, Shapes, and Morphologies

Contact Info

Product

Resources

About

Excitonic absorption and defect-related emission in three-dimensional MoS₂ pyramids