7 Works

A simple and inexpensive technique for obtaining low dimensional semiconductor nanostructures

S. Larramendi
The isothermal closed space sublimation (ICSS) is a simple and effective technique of low- cost, used to obtain thin films of semiconducting materials, embedding nanoporous substrates with semiconducting materials, or to grow nanocrystals inside pores. In this work it is explained how to use this technique to conform semiconductor structures using porous alumina membranes and ZnO nanorod matrix as template. As a result a structure with potential use in photovoltaic solar cells is obtained, with...

Design and optimization of silicon nanostructures

B. Dieng, M. Beye, M. Toure, D. Diouf, D. Kobor & A.S. Maiga
in this work, recent advances in various silicon nanostructures used in crystalline silicon solar cells for antireflection and light trapping are reviewed. Simulations and optimizations are also performed for the most relevant of these nanostructures. The results showed that nanocones and nanoparaboloids outperform nanopillars and give almost the same antireflective performance, reducing the average reflectance of the crystalline silicon surface below 2% in the wavelength range 300-1100 nm and under normal incidence. This reflectance is...

Characterization and modeling of solar radiation on the ground, application to the estimate of solar potential available on the coast of Nouakchott

Ahmed Sidibba, Diene Ndiaye, Sidi Bouhamady & Menny El Bah
The purpose of this work is to evaluate four empirical models developed in literature such as Ghouard, Perrin Brichambaut, Bird and Hulstrom and Dependent model of the Link trouble factor. The validation of these different theoretical models was carried out using solar global radiation data collected on the Cheikh Zayed Nouakchott power plant. These measurements were carried out at a time step of 5 minutes during the period of one year. (April 1, 2015 to...

Optical properties of PZN-PT nanoparticles thin layer on ITO glass for photovoltaic application

R. Ndioukane, D. Kobor, L. Motte & J. Solard
In this work, undoped and Mn doped Pb(Zn 1/3 Nb 2/3 )O 3 -4.5PbTiO 3 nanoparticles were dispersed in biopolymer and in mixed biopolymer + pentacene as active layer and deposited by spin coating on ITO glasses. Morphological, optical and electrical properties of these layers were investigated. SEM images show the superposition of different deposited layers ITO/TiO2/PZN-PT-np-biopolymer on glass substrate with thicknesses of 1.600 μm, 1.505 μm and 1.765 μm respectively. The absorbance value in...

Modelling and simulation of an automatic solar module characteristics data acquisition system

E. Akoro, G.J.P. Tevi, M.E. Faye, M. Sene & A.S. Maiga
This paper is devoted to the design and simulation of an automatic data acquisition system of solar module characteristics. The system is essentially composed of three parts. The first part is devoted to the acquisition of the electrical parameters of the solar module (Current, Voltage and Power) in automatic ways using an automatic variable load. The second part is focused on devices which measure the ambient temperature and solar irradiation. In the last part, we...

Lecture on the anomalous diffusion in Condensed Matter Physics

M. Benhamou
Diffusion is a natural or artificial process that governs many phenomena in nature. The most known diffusion is the Brownian or normal motion, where the mean-square-displacement of the tracer (diffusive particle among others) increases as the square-root of time. It is not the case, however, for complex systems, where the diffusion is rather slow, because at small-scales, these media present an heterogenous structure. This kind of slow motion is called subdiffusion, where the associated mean-square-displacement...

Raman active modes of single-wall boron nitride nanotubes inside carbon nanotubes

A.M. Nassir, AH. Rahmani, M. Boutahir, B. Fakrach, H. Chadli & A. Rahmani
The structure of boron–nitride nanotubes (BNNTs) is very similar to that of CNTs, and they exhibit many similar physical and chemical properties. In particular, a single walled boron nitride nanotube (BNNT) and a single walled carbon nanotube (CNT) have been reported. The spectral moment’s method (SMM) was shown to be a powerful tool for determining vibrational spectra (infrared absorption, Raman scattering and inelastic neutron- scattering spectra) of harmonic systems. This method can be applied to...

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