Thèses de Doctorat "Physique"

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    Etude du fonctionnement des dispositifs électroniques à base de silicium microcristallin : Simulation numérique et approche expérimentale
    (Université Oran 1 Ahmed Ben Bella, 2020-10-28) CHAHI Mokhtar
    Hydrogenated microcrystalline silicon has been largely studied and several research works have investigated based on the correlations between electronic, optical and structural properties. Although many studies, the transport properties are still not fully understood because the interpretation of experimental data are complicated due the structure of microcrystalline materials which is formed by grains, grain boundary and amorphous phase. The cells that we have investigated in this first part are the electrical properties simulation of Schottky diodes based intrinsic hydrogenated microcrystalline silicon with 1 micro m of thickness and with different crystalline volume fraction, comparing with Schottky diodes based on amorphous silicon. We have used a detailed electrical-optical computer Analysis of microelectronic and photonic structures (AMPS - 1D) in conjunction with the experimental characterization of hydrogenated microcrystalline silicon thin-film solar cells of different degrees of crystallinity. The simulation results suggest that the cell based on hydrogenated microcrystalline silicon has an efficiency of photovoltaic conversion greater than that observed for the cell based on hydrogenated amorphous silicon. To improve light-trapping in thin film solar cells, diffractive gratings are one type of optical nanostructure that reveals great potential in this field. As a typical example, the gratings considered are square pillar of two dimensions based on silicon crystalline c-Si. Gratings with periods of 1.2, 1.5 and 1.8 micro m and depth of 400 nm were located on the rear side of the cells. These results demonstrated that period around of 1.2 mcro m will be better for a grating placed on the rearside of a solar cell based on crystalline silicon to improve the enhancement light absorption.