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
High-symmetry ZnS hepta- and tetrapods composed of assembled ZnS nanowire arrays
TL;DR: In this paper, sixfold symmetry heptapodlike and threefold symmetry tetrapod-like ZnS structures have been fabricated by thermal evaporation of a ZNS and SiO mixture source in N2 at 1300°C.
Journal Article
High-symmetry ZnS hepta- and tetrapods composed of assembled ZnS nanowire arrays
TL;DR: In this article, sixfold symmetry heptapodlike and threefold symmetry tetrapod-like ZnS structures have been fabricated by thermal evaporation of a ZNS and SiO mixture source in N2 at 1300°C.
Journal ArticleDOI
Calculated phonon band structure and density of states and interpretation of the Raman spectrum in rocksalt ScN
TL;DR: In this paper, the phonon band structures and density of states of ScN were compared with the Raman data by Travaglini et al. They found that the latter shows not a pure but weighted density, with a larger intensity for the LO L modes Several features can be accounted for with Van Hove singularities at the zone boundary.
Journal ArticleDOI
A tetragonal phase of superhard BC2N
TL;DR: Based on first-principles calculation, the authors predicts a tetragonal phase of BC2N (t-BC2N), which matches the experiment well because the estimated Vickers hardness and the simulated X-ray diffraction (XRD) and Raman patterns are in excellent agreement with the experimental results besides the low total energy and formation energy.
Journal ArticleDOI
The pressure-induced phase transition in SnO: a first-principles study
TL;DR: In this article, a structural phase transition from α-SnO to γ-snO is predicted at 1.1 GPa by evaluating the enthalpy difference of the two crystal structures.