الفهرس 
Introduction to Solar CellsOnly 14 pages are availabe for public view
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Abstract
According to the current world needs for energy depending on renewable sources and especially solar energy , many types of research on solar cells and materials.Solar cells become the future of energy generation and the basic source of power in space and terrestrial applications.The field of solar cells energy converts has had a century of successful development and application and two centuries since Becquerel 1839 when Becquerel first discovered that a photo-voltage was developed when light was directed on to one of the electrodes in an electrolyte solution, it was born in the early days of solid-state electronics and space application .There are over 3000 space satellites deployed which are powered by solar cell arrays .
Ability of energy generation from the solar cells depends on sun radiation intensity, material used to manufacture solar cells and position of solar cell system on Earth.
Sun radiation intensity for any position differ from season to season; therefor some systems use solar tracking.
This thesis provides a comparative study between two materials Silicon and Gallium Arsenide solar cells on terrestrial application where we make a design building a system with technical and economical analysis.We study here two photovoltaic (PV) systems that used silicon and GaAs materials : PV fixed system ( without tracking) and manual tracking.
For space applications we measure the correlation between solar radiation pressure and solar cell materials (Silicon and GaAs) for satellites , and we showed that the effect of solar radiation pressure on silicon is larger than on GaAs.
Key words : Photovoltaic (PV) system, GalliumArsenide (GaAs), Silicon (Si), ON Grid, Economics, solar radiation pressure, low earth orbit (LEO)