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The International Renewable and Sustainable Energy Conference (IRSEC'16) was really a very special edition owing to the wonderful opportunity it has to be held among the official events organized within the “Conference of the Parties” (COP22) of the United Nations Framework Convention on Climate Change (UNFCCC).
Our work focuses on the simulation and optimization of InSb/GaAs quantum dot solar cell. We have studied the effects of different parameters of the quantum dot such as the number of layers, the thickness and their influence on the solar cell characteristic (Current-Voltage, and the External Quantum Efficiency EQE). Moreover, we have studied the Photoluminescence PL spectra in order to characterize...
The electrical and optical properties of InAsP/Si quantum dot solar cell are numerically analyzed in this paper. We have investigated many effects like the number of quantum dot layers inserted, and Arsenic composition of InAsxP1−x on the mains characteristics of a solar cell: Current-Voltage, and the External Quantum Efficiency EQE. It has been shown that Arsenic composition of 60% and 80% provide...
Cu- and Cl-doped ZnO thin films were electrodeposited on conductive glass substrates in a non-aqueous electrolyte containing Cu, Cl and Zn salts. The Cu content of the films was found to be proportional to the [Cu2+]/[Zn2+] precursor ratio in the deposition electrolyte. Electrodeposited ZnO:Cu thin films exhibit hexagonal wurtzite structure with (002) preferred orientation. A transition from n-type...
The ZnO thin films were deposited by spray pyrolysis technique on glass substrate heated at 450° C, using as source zinc acetate with a molar concentration of 0.05 mol/l. Our interest is to study in some details the effect of doping Gd:ZnO (GZO) and co-doping Gd,Li:ZnO (GLZO) on optical properties. For this, we have used the optical UV-Visible spectroscopy to determine the band gap energy of the samples...
In this work, a front graded band gap of CIGS absorber is simulated where a spatial variation of the band gap energy decreases from a maximum value Egmax at the limit of the junction to a minimum value Egmin at the vicinity of the back contact within the length of the CIGS layer. An effective absorption coefficient due to this variation was defined. It will be seen that this graded profile contributes...
in In this work, we study the effect or the different copper precursors on the structural optical and electrical properties of CuO thin films deposited on glass substrates using spray pyrolysis technique, the phase of tenorite (CuO) are identified using X-Ray diffraction. A single phase without impurities is observed for the three precursors. The band gap energy and others optical parameters are calculated...
In this paper, the Infrared spectra of hybrid nanostructures obtained by confinement of oligothiophene derivatives in two sheets of graphene are calculated in the framework of spectral momentmethod, together with a bond-polarizability model. Minimum energy calculations are performed, using a convenient Lennard-Jones expression of the van der Waals intermolecular potential, to derive the optimum configurations...
In this study, we investigated the effect of the chemical ratios (x=Ga/In+Ga) on the structural and optical properties of the chalcopyrite Cu(Inx−1, Gax)S2 thin films made by spray pyrolysis. Structural analysis by X-ray diffraction revealed that the CIGS crystallizes in a polycrystalline structure with chalcopyrite phase and a preferential growth orientation [112]. The best crystallinity was observed...
The present study reports on the structural, morphological, optical and electrical properties of Zn1−xVxO (0 ≥ x ≥ 0.30) thin films. These films of ∼ 200 to 240 nm thickness with low and high vanadium loading, were grown by rf-magnetron sputtering on Si (100) and glass substrates at room temperature (RT) and 200 °C, respectively, using Zn1−xVxO nanopowder like targets. In regard to this, it should...
Conduction mechanism was investigated from DC and AC conductivity measurements in the thin film ternary semiconductor Cu2SnS3 compound. The electrical properties of this material were analyzed by impedance spectrometry (IS) in the frequency range 100 Hz – 1 MHz and in low temperature up to 77 K (−196 °C). The activation energy for the conduction process is estimated from the analysis of the temperature...
In this work, we focus on the effect of trivacancy defects on vibrational and electronic properties of single wall carbon nanotube (SWNT). The nonresonant Raman spectra of these nanomaterials were calculated in the framework of the bond-polarizability model combined with the spectral moment's method. The evolution of the Raman spectrum and the electronic density of states as a function of the spatial...
This study presents performances comparison of optical and geometrical properties of two optical concentrators: A Compound Parabolic Concentrator (CPC) and a Dielectric Totally Internally Reflecting Concentrator (DTIRC). These concentrators are used as a secondary optical element in both cases with and without a Fresnel lens as a primary stage. Results show that the optical efficiency is almost equal...
To improve the performance of Solar Vehicle (SV), supercapacitor has been used as an auxiliary energy storage system. Indeed, SCs are used as an energy storage device during fast power changes and recovers the braking energy to enhance the SV autonomy. In other hand, the batteries are used to meet the energy requirements for a relatively long duration and to store the excess of energy. This work addresses...
The interfaces in multilayer inverted polymer solar cells based P3HT / PCBM bulk heterojunction were prepared and studied on a flexible polyethylene naphthalate (PEN) substrate. The annealing effect on each interface of the PEN/ITO/ZnO multilayer and also ZnO/P3HT:PCBM on the structural, photophysical and photovoltaic properties was investigated and scrutinized directly on OPV device using the tomographic...
The power-voltage characteristic curve of solar PV modules has a multiple local maximum under partial shading conditions; in this case the conventional MPPT methods fail to track the real maximum power point which reduces the efficiency of the photovoltaic system. To keep the PV modules operate with their maximum power, this paper places a novel algorithm which is able to detect and track the global...
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