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B. Poornaprakash^a1, P. T. Puneetha^b1, M. S. P. Reddy^c, Y. L. Kim^a,*
Chalcogenide Letters, Vol.20, No.2, pp. 85-90, 2023, DOI:10.15251/CL.2023.202.85
Abstract ZnS and Er (2 at%) doped ZnS nanoparticles (NPs) were synthesized through coprecipitation process. EDAX analysis confirmed that the presence of Er (III) ions in the prepared sample with an anticipated stoichiometry. TEM analyses displayed that the prepared NPs showed near spheroid shapes with an average size ranging from 4.8 to 5.2 nm. XRD measurements confirmed the authentic incorporation of Er (III) ions in the ZnS lattice. DRS measurements certified that Er (III) doping declines the ZnS bandgap from 3.72 to 3.56 eV. Magnetic measurements revealed that the Er-doped ZnS NPs displayed soft ferromagnetism and More >

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R. H. Athab, B. H. Hussein^*
Chalcogenide Letters, Vol.20, No.2, pp. 91-100, 2023, DOI:10.15251/CL.2023.202.91
Abstract A thin film of AgInSe₂ and Ag_1-xCu_xInSe₂ as well as n-Ag_1-xCu_xInSe₂ /p-Si heterojunction with different Cu ratios (0, 0.1, 0.2) has been successfully fabricated by thermal evaporation method as absorbent layer with thickness about 700 nm and ZnTe as window layer with thickness about 100 nm. We made a multi-layer of p-ZnTe/n-AgCuInSe2/p-Si structures, In the present work, the conversion efficiency (η) increased when added the Cu and when used p-ZnTe as a window layer (WL) the bandgap energy of the direct transition decreases from 1.75 eV (Cu=0.0) to 1.48 eV (Cu=0.2 nm) and the bandgap energy for… More >

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R. C. Gupta^a, P. Varshney^b, Pravesh^c, M. Lal^d, D. Kumar^e, K. Singh^a, A. S. Verma^f,g,*
Chalcogenide Letters, Vol.20, No.2, pp. 101-112, 2023, DOI:10.15251/CL.2023.202.101
Abstract A study of experimental data reveals that the bulk modulus of chalcogenides and pnictides based chalcopyrites (A^II B^IVC₂ ^V and A^I B^III C₂ ^VI ) can be explained by a simple scaling rule that rely only on the crystal ionicity, ionic charge product, and the melting temperature. PVV theory of crystal ionicity, temperature dependence of elasticity and product of ionic charge theory are taken into account for the study. Based on this result, a simple microhardnessbulk modulus relation is applied to evaluate the microhardness of the complex compounds; which correspond well with the experimental data and other published results. More >

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A. K. Aqili^a,*, T. Abu-Omar^a, A. Y. Al-Reyahi^a, A. Shaheen^a, S. Al-Omari^a, I. Alhagish^a
Chalcogenide Letters, Vol.20, No.2, pp. 113-120, 2023, DOI:10.15251/CL.2023.202.113
Abstract Zinc Telluride (ZnTe) films were prepared by the closed space sublimation (CSS) method. The effect of chemical treatments with concentrated phosphoric acid, on the optical, electric and structural properties of the films was studied. Zinc-blend structure of the polycrystalline nature of the films was confirmed by x-ray diffraction (XRD) spectra. The energy dispersive x-ray (EDX) shows an increase in Te ratio on the surface of the film as exposed to phosphoric acid. In addition, the dc electrical resistivity of the films was dropped considerably. The refractive index, thickness, and thickness irregularity of the films were More >

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N. K. Cinsy^*, R. R. Jeya Geetha
Chalcogenide Letters, Vol.20, No.2, pp. 121-129, 2023, DOI:10.15251/CL.2023.202.121
Abstract The characterizations of synthesized CdZnS nanoparticles with Clitoria ternatea (Asian pigeon wings) leaf extract were done by the chemical precipitation method. The formation of CdZnS nanoparticles with the extract was confirmed by making use of XRD, SEM analysis and EDAX. XRD disclosed the structure and also the particle size. SEM investigation of CdZnS NPs confirmed shape and size. The optical studies were executed for the prepared sample. From the obtained UV-visible spectrum, band gap energy was determined using the Tauc plot. The photocatalytic activity of the processed sample was also analysed. More >

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I. Ur Rahman^a, M. Khalid^a, M. Aamer^a, F. Ali^a, M. U. Javed^a, Q. Rafiq^b, M. Jawad^a, T. Raouf Qureshi^a, M. Irfan^b, S. Azam^a,*
Chalcogenide Letters, Vol.20, No.2, pp. 131-144, 2023, DOI:10.15251/CL.2023.202.131
Abstract We presents our analysis on structural electronic and optical properties of TlX and TlMX₂ (M =In, Ga; X = Te, Se, S) compound, by first principle density functional theory (DFT).These chalcogenide have a place with a group of the low-dimensionals semiconductors having chains or layered design. They are of critical interested as a result of, their exceptionally anisotropics properties, semiconductivity and photoconductivity, non direct impacts in their IV qualities (counting a district of negatived differentials opposition), exchanging and memories impacts, secondly symphonious opticals age, relaxors conduct and possible application for optoelectronics devices. We reviews the crystals More >

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H. K. Hassun^a, B. K. H. Al-Maiyaly^a, A. H. Shaban^b,*
Chalcogenide Letters, Vol.20, No.2, pp. 145-152, 2023, DOI:10.15251/CL.2023.202.145
Abstract In this work, we have examined the spectral response of (p-CuAlSe₂/n-Si) detector, (CAS) thin films deposited by thermal evaporation at RT with a thickness (450) nm, and annealing temperature at (473K) for 2 h. Optical transmission measurements displayed reasonably slight transmission besides higher absorbance trendy the visible region, energy gaps were observed by annealing, were found to be direct, and decreased with the effect of annealing. The extreme responsivity value arises at wavelength 459 nm, with improvement value of specific detectivity and quantum efficiency the annealing films be situated originate as greatest suitable aimed at numerous More >

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Y. L. Ma^*, Y. Y. Tao
Chalcogenide Letters, Vol.20, No.2, pp. 153-164, 2023, DOI:10.15251/CL.2023.202.153
Abstract The key to achieve efficient degradation of organic pollutants lies in improving the separation efficiency of photogenerated electron-hole pairs in photocatalysts. Here, the hydrogen bonds between g-C₃N₄ layers were broken by concentrated acid etching and exfoliation to obtain a more dispersed and lighter g-C₃N₄ nanosheet structure, and then the CdS spherical nanoparticles were dispersed on g-C₃N₄ nanosheets by hydrothermal method. The optimal loading of CdS on g-C₃N₄ nanosheets was determined by testing the degradation performance of the composite photocatalysts with different loading amounts. The degradation performance was tested by simulating sunlight using a 700-800 W xenon lamp More >

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N. Messei^a,*, M. S. Aida^b, A. Attaf^a, N. Hamani^a, S. Laznek^c
Chalcogenide Letters, Vol.20, No.2, pp. 165-175, 2023, DOI:10.15251/CL.2023.202.165
Abstract To enhance the efficiency of kesterite Cu₂ZnSnS₄ solar cell, different gradient strategies are investigated. Absorber layer gradient is obtained by partial substitution of sulfur with selenium or tin with germanium. The PV Parameters are calculated using the SCAPS1D program. The effect of the front, back, and double gradient on the cell parameters was investigated. We proposed also the fully graded gap absorber layer profile. The opencircuit voltage has increased to 1.040V, the fill factor has increased to 71.69%, and the efficiency has exceeded 22.95%. In contrast to other types of gradients, the short-circuit current density remains More >

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