Journal ArticleDOI
Raman scattering study of zinc blende and wurtzite ZnS
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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
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The Influence of Substrate Temperature on Properties of Zinc Sulphide Thin Films Synthesized by Chemical Spray Pyrolysis
P. O. Offor,S.N. Ude,G.M. Whyte,C. S. Obayi,Paul S. Nnamchi,A. D. Omah,F. U. Whyte,S. C. Madu,Uche Chinweoke Ogbuefi,CC Daniel-Mkpume,Boniface Onyemaechi Anyaka,B. A. Okorie,Fabian I. Ezema +12 more
Abstract: Zinc sulphide films find vast applications in photoluminescent, optoelectronic and solar cells applications [1]. This has led to recent focus of research on this area of chalcogenide semiconductor materials. It is characterized by high refractive index, wide direct energy gap and high transmittance in the visible spectra [2], non-poisonous and ecofriendly [3]. The goal of good research is to improve on device performance and reliability at minimal cost. This has led researchers to deposit thin films using different techniques as CBD [4], SILAR [5], CSP [6], thermal evaporation [7] and Sol-gel [8]. In the midst of these, CSP is more advantageous because it is economical and useful for deposition of uniform and coherent thin films on large area surfaces at moderate operating temperatures [9].
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Structural, morphological, optical properties of CVDZnS and HIPZnS
Li Guo,Wei Naiguang,Hai Yang,Xiaohua Liu,Zhirui Tian,Li Jianming,Lipeng Jiang,Li Dongxu,Pengfei Zhang,Zilin Song +9 more
TL;DR: In this article, X-ray diffraction was performed on CVDZnS and non-hot isostatic pressure (HIP) to characterize the structure and properties of the two materials.
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Correlation with surface defects and maiden observation of disorder activated phonon in cubic ZnS QDs.
TL;DR: In this article, the disorder activated phonon (DAP) was observed with significant intensity at 153cm−1 along with the LO mode at 347 cm−1 for the cubic ZnS.
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The pronounced role of impurity phases in the optical properties of Mn catalyzed ZnS nanostructures
U. Nosheen,Muhammad Arslan Shehzad,Shania Rehman,Muhammad Hafeez,M. A. Khan,Umair Manzoor,Umair Manzoor,Arshad Saleem Bhatti +7 more
TL;DR: In this article, the effect of self-doping in Mn catalyzed ZnS nanostructures grown via vapor liquid solid mechanism was reported, which also resulted in the formation of additional impurity minority phases like ZnO and MnO2.
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First-principles investigation of the effect of crystal structure on sulfur isotope fractionation in sulfide polymorphs
TL;DR: In this article, the effect of crystal structure on S isotope fractionation properties of sulfide polymorphs was studied and the reduced partition function ratios of S-34/S-32 (10(3)ln beta(34-32)) for FeS2, CoAsS, ZnS, CdS and MnS polymorphs were calculated.
References
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Journal ArticleDOI
Phonons and related crystal properties from density-functional perturbation theory
TL;DR: In this paper, the current status of lattice-dynamical calculations in crystals, using density-functional perturbation theory, with emphasis on the plane-wave pseudopotential method, is reviewed.
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Temperature dependence of Raman scattering in ZnO
Ramón Cuscó,Esther Alarcon-Llado,Jordi Ibáñez,Luis Artús,Juan Jiménez,Buguo Wang,Michael J. Callahan +6 more
TL;DR: In this paper, a Raman scattering study of wurtzite was carried out over a temperature range from 80 to 750°C, where the second-order Raman features were interpreted in the light of recent ab initio phonon density of states calculations.
Journal ArticleDOI
Resonant Raman scattering in cubic and hexagonal boron nitride
TL;DR: In this article, first and second-order Raman scattering in cubic and hexagonal boron nitride using excitation energies in the visible and in the UV was measured.
Journal ArticleDOI
First-principles calculation of vibrational Raman spectra in large systems: signature of small rings in crystalline SiO2.
Michele Lazzeri,Francesco Mauri +1 more
TL;DR: The signature of 3- and 4-membered rings in the Raman spectra of several polymorphs of SiO2, including a zeolite having 102 atoms per unit cell is studied.
Journal ArticleDOI
Zone-boundary phonons in hexagonal and cubic GaN
H. Siegle,G. Kaczmarczyk,L. Filippidis,Alexander P. Litvinchuk,Axel Hoffmann,Christian Thomsen +5 more
TL;DR: In this paper, the second-order Raman-scattering experiments on hexagonal and cubic GaN covering the acoustic and the optical overtone spectral region were presented, and the observed structures were assigned to particular phonon branches and determined the points in the Brillouin zone from which the scattering originates.