Journal ArticleDOI
Raman scattering study of zinc blende and wurtzite ZnS
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TLDR
In this article, the first and second-order Raman scattering of zinc blende and wurtzite ZnS was studied and the origins of these vibration modes in the second order Raman spectra from these two polymorphs were identified for the first time.Abstract:
We have conducted an experimental and theoretical study on first- and second-order Raman scattering of zinc blende and wurtzite ZnS. Based on the calculated phonon band structure, phonon density of states, and symmetry selection rules, we have clearly identified for the first time the origins of these vibration modes in the second-order Raman spectra from these two polymorphs. For zinc blende ZnS, it is found that the previously estimated frequency of the LA mode at X point in the Brillouin-zone boundary is much smaller than the value obtained from other experiments and our calculation. Considering the involvement of LA phonon at X point, we reassign the second-order Raman active modes and some other modes which have not yet been understood so far. This work clarifies some of the controversial Raman mode assignments in zinc blende and wurtzite ZnS.read more
Citations
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Zinc vacancy-promoted photocatalytic activity and photostability of ZnS for efficient visible-light-driven hydrogen evolution
TL;DR: In this article, zinc vacancy defects are successfully introduced into zinc sulfide (ZnS) via adding sodium sulfide as sulfur source during the hydrothermal reaction, and the defective ZnS with different amount of zinc vacancies were employed as catalysts for the examination of vacancy-dependent catalytic activity toward photocatalytic hydrogen evolution under visible light irradiation.
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Imaging and phase identification of Cu2ZnSnS4 thin films using confocal Raman spectroscopy
TL;DR: In this article, confocal Raman spectroscopy and imaging can distinguish between CZTS and the other binary and ternary metal sulfides, which is a potential candidate for next generation thin film solar cells.
Journal ArticleDOI
Alloyed Copper Chalcogenide Nanoplatelets via Partial Cation Exchange Reactions
Vladimir Lesnyak,Chandramohan George,Chandramohan George,Alessandro Genovese,Mirko Prato,Alberto Casu,S. Ayyappan,Alice Scarpellini,Liberato Manna +8 more
TL;DR: The synthesis of alloyed quaternary and quinary nanocrystals based on copper chalcogenides with tunable chemical composition were characterized by optical spectroscopy and cyclic voltammetry, which demonstrated tunability of their light absorption characteristics as well as their electrochemical band gaps.
Journal ArticleDOI
ZnS grain size effects on near-resonant Raman scattering: optical non-destructive grain size estimation
Andrew Fairbrother,Victor Izquierdo-Roca,Xavier Fontané,Maria Ibáñez,Andreu Cabot,Andreu Cabot,Edgardo Saucedo,Alejandro Pérez-Rodríguez,Alejandro Pérez-Rodríguez +8 more
TL;DR: In this article, the area ratios between the first, second, and third order peaks of ZnS identified as the T2(LO) mode decrease with increasing grain size, attributed to changes in the bandgap energy from quantum confinement due to the varying grain size between the films/particles.
References
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Journal ArticleDOI
Raman Effect in Wurtzite- and Zinc-Blende-Type ZnS Single Crystals
O. Brafman,S. S. Mitra +1 more
TL;DR: In this article, the Raman spectra of wurtzite and zinc-blende-type ZnS single crystals were excited by a He-Ne laser (6328 ) and an argon-ion laser (4880 ) and the phonon frequencies were determined.
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Raman Spectrum of Cubic ZnS
TL;DR: In this paper, a detailed study of the first and second-order Raman effect in cubic ZnS using both 4880 and 5145 \AA{} excitation was presented.
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Raman Scattering from Surface Phonons in Rectangular Cross-sectional w-ZnS Nanowires
TL;DR: In this article, the surface optic (SO) band is assigned to surface-optical phonons based on a dielectric continuum model for rectangular cross-section wires, and a symmetry breaking mechanism which may activate the SO mode is also discussed.
Journal ArticleDOI
Phonon dispersion and phonon densities of states for ZnS and ZnTe
TL;DR: In this article, the authors used a VSM and a variable shell charge extension (VCM) model to estimate the phonon density of states and Debye temperature of II-VI zincblende crystals.