I. Sajjad^a, U. Parveen¹, H. Al-Ghamdi^b,*, M. Yaseen^a, S. Saleem^a, Nasarullah^a

Chalcogenide Letters, Vol.22, No.9, pp. 829-845, 2025, DOI:10.15251/CL.2025.229.829

Abstract Herein, we employed modified Becke-Johson (mBJ) potential based first principles method to investigate the structural, optoelectronic, and magnetic properties of pure SrS and Ni doped Sr_1-xNi_xS alloys at varying doping concentrations. Formation enthalpy analysis predicts thermodynamical stability of resultant alloys. Geometry optimization was performed in order to optimize the super cells to obtain ground state energy state. After confirming their stability, we investigated their magnetic, electronic, and optical attributes. Pure SrS exhibits an indirect band gap of 3.53 eV (which is in good agreement with experiments), while nickel doping in SrS results in lowering the bandgap… More >

S. Kumar^a, A. Alam^b, K. P. Tiwary^c,*

Chalcogenide Letters, Vol.21, No.7, pp. 567-574, 2024, DOI:10.15251/CL.2024.217.567

Abstract The development of CdZnS thin films using the chemical bath deposition process in nonaqueous media is a technological challenge. In this work, 75 millilitres of ethylene glycol and ethanol (1:2 ratios) were used to develop a CdZnS thin film on ITO and FTO glass substrates using cadmium acetate, zinc sulphate, and thiourea. The ideal bath temperature was kept at 130℃ and the anneal temperature of the film that had been deposited in the air was maintained at 350℃. The films have been examined using FTIR, WCA, FESEM, and XRD. XRD studies reveal that CdZnS films… More >

A. Skender^a, A. Aissat^a,b,c,*, J. P. Vilcot^c

Chalcogenide Letters, Vol.21, No.8, pp. 651-663, 2024, DOI:10.15251/CL.2024.218.651

Abstract The use of semiconductors based on abundant and less expensive materials in photovoltaic industry has grown since electricity consumption has increased, alloys such as Cu₂ZnSn(S_1-xSe_x)₄ have recently attracted attention, due to its structural, optical and electronic properties which make it a very promising candidate as an absorber layer in photovoltaic applications. The lattice mismatch of Cu₂ZnSn(S_1-xSe_x)₄ with Cu2NiGeS4 as substrate for solar cell architecture reveals that low Se content (0.1≤x≤0.4) is favorable, and thus, by reducing Se content from 40 to 10% induces a decrease in optical parameters such as refractive index from 5.475 to 3.834 More >

M. Ishfaq^a, A. Aziz^a, S. A. Aldaghfag^b, S. Noreen^c, M. Zahid^c, M. Yaseen^a,*

Chalcogenide Letters, Vol.21, No.8, pp. 615-629, 2024, DOI:10.15251/CL.2024.218.615

Abstract Herein, structural, optoelectronic, and thermoelectric characteristics of Ba₂CaTeO₆ and Ba₂CaWO₆ oxides double perovskite have been evaluated by first-principles calculations. Enthalpy of formation and tolerance factor are computed to ensure the respective structural and thermodynamical stability. Ba₂CaTeO₆ and Ba₂CaWO₆ have mBJ computed bandgaps of 5.87 eV and 4.20 eV, respectively. Furthermore, the optical parameters like dielectric constants (ԑ₁(ω) & ԑ₂(ω)) and other related parameters are computed. The thermoelectric (TE) parameters were examined using the BoltzTraP package. The ZT values of Ba₂Ca(Te/W)O₆ at 450 K are 0.76/0.79, respectively. The outcomes of the Ba₂CaTeO₆ and Ba₂CaWO₆ double perovskite show that these materials are More >

Prabhakar Misra^1,*, Hawazin Alghamdi¹, Raul Garcia-Sanchez¹, Wyatt Mitchell², Allison Powell³, Nikhil Vohra⁴

The International Conference on Computational & Experimental Engineering and Sciences, Vol.31, No.4, pp. 1-1, 2024, DOI:10.32604/icces.2024.013296

Abstract Semiconducting quantum dots (Q-dots) with strain-tunable electronic properties are good contenders for quantum computing devices, as they hold promise to exhibit a high level of photon entanglement. The optical and electronic properties of Q-dots vary with their size, shape, and makeup. An assortment of Q-dots has been studied, including ZnO, ZnS, CdSe and perovskites [1]. We have employed both Raman spectroscopy (to precisely determine their vibrational frequencies) and UV-VIS spectroscopy (to determine accurately their band gap energies). The electronic band structure and density of states of the ZnO and ZnS Q-dots have been investigated under More >

Doaa Sami Khafaga¹, Zongming Lv², Imran Khan^3,4, Shebnam M. Sefat⁵, Amel Ali Alhussan^1,*

CMC-Computers, Materials & Continua, Vol.77, No.3, pp. 3723-3740, 2023, DOI:10.32604/cmc.2023.039956 - 26 December 2023

Abstract With the capacities of self-learning, acquainted capacities, high-speed looking for ideal arrangements, solid nonlinear fitting, and mapping self-assertively complex nonlinear relations, neural systems have made incredible advances and accomplished broad application over the final half-century. As one of the foremost conspicuous methods for fake insights, neural systems are growing toward high computational speed and moo control utilization. Due to the inborn impediments of electronic gadgets, it may be troublesome for electronic-implemented neural systems to make the strides these two exhibitions encourage. Optical neural systems can combine optoelectronic procedures and neural organization models to provide ways… More >

Shams B. Ali¹, Sarmad Fawzi Hamza Alhasan¹, Evan T. Salim^2,*, Forat H. Alsultany³, Omar S. Dahham^4,5

Journal of Renewable Materials, Vol.10, No.11, pp. 2819-2834, 2022, DOI:10.32604/jrm.2022.021609 - 29 June 2022

Abstract The pulsed laser deposition (PLD) technology was used to effectively create conductive nano and micro hafnium oxide with great purity and transparency for (HfO₂) nanofilms. In many optoelectronics devices and their applications, the presence of a high dielectric substance like a nano HfO₂, between the metal contacts and the substrates was critical. We used the Pulsed Laser Deposition method to fabricate an Al/HfO₂/p-Si Schottky barrier diode where the nanostructured HfO₂ films as an intermediate layer and varied substrate temperatures. The optical result reveals a high degree of transparency (93%). The optical bandgap of deposited HfO₂ films was observed… More >

Mayyadah H. Mohsin¹, Najwan H. Numan², Evan T. Salim^1,*, Makram A. Fakhri^2,*

Journal of Renewable Materials, Vol.9, No.9, pp. 1519-1530, 2021, DOI:10.32604/jrm.2021.015465 - 23 April 2021

Abstract A SiC nanofilms have been deposited and investigated on quartz and silicon substrates using pulsed laser deposition technique with the 300 pulses of Nd: YAG laser at two different laser wavelengths of 1064 nm and 532 nm. The structural, morphological, and optical properties of the deposited nanostructure SiC were prepared and characterized as a function of the wavelengths of the used laser. The structural result shows four different pecks at (111), (200), (220), and (311) planes related to Nano SiC. The transmission result presents that the optical energy gap value for the SiC nanostructure is More > Graphic Abstract