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This work deals with the modeling and optimization of the CuInGaSe/CdS based structure, for photovoltaics. In this study we took into consideration the effect of the concentration of the alloy and the temperature on the strain bandgap, the absorption and efficiency of the structure. It has been shown that the gallium concentration x varies the strain bandgap energy, these two parameters significantly...
In this work, CuInS2 (CIS) thin films were prepared by spray pyrolysis method, and optical properties were investigated. CuInS2 in the form of films is prepared at different deposition conditions by a simple and economical spray pyrolysis method. Optical constants such as band gap Eg, extinction coefficient k, refractive index n, and dielectric constants e1 and e2 were determined from the measured...
In this study, we compare the structural properties of the three phases wurtzite (B4), zinc blende (B3), and rocksalt (B1) of ZnO using the generalized gradient approximation (GGA) and the modified Becke-Johnson TB-mBJ potential to compare their electronic and optical properties. It's found that the wurtzite phase is energetically the most stable. Zinc blende and wurtzite structures show similar electronic...
One of the limiting factors of solar cell efficiency is the inability of the latter to absorb photons with low energy than the gap. Among the new approaches to reduce such losses and to enhance the efficiency is using what are called Multiple Quantum Wells MQWs inside the intrinsic region of a p-i-n solar cell of wider band-gap energy (barrier or host) semiconductor. These configurations are intended...
With the increasing of energy demand for air conditioning purpose in Algeria, absorption solar cooling systems represents a very good alternative for clean cooling production where over-consumption of electricity occurs. In this paper, a modeling and simulation of an absorption solar cooling machine under Algerian climate is presented. This study was based on a single stage absorption cooling machine...
This paper deals with fabrication and thermomechanical characterization of energy efficient composite materials of mortar reinforced by date palm fibers (DPF) from Marrakech. The weight percentage of the fibers in the cement varies from 0% to 7%. The device EI700 of steady state and the device « Microcomputer controlled electronic universal testing machine » have been used respectively for thermophysical...
Mixed bromide-iodide methylammonium lead-halide perovskites have been synthetized from methylamine, lead nitrate and the corresponding hydroX acid (X= I, Br) precursors and thereafter deposited as thin films onto FTO substrates by spin coating or dipping. Thin film perovskites were then characterized by X-Ray Diffraction, optical spectrometry and photoluminescence. All synthetized MAPbI3, MAPbBr3...
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