الفهرس 
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Abstract
The aim of this study is to investigate the influence of some environmental parameters on the characteristics of inorganic and organic solar cells. The environmental parameters that have been studied are irradiance, temperature, atmospheric dust and gases and gamma rays.
The influence of solar irradiance on the I-V characteristics of (CdS/Cu2S) and (monocrystalline Si) Solar Cells have been studied. In both of them, a linear increase is observed in short circuit current and maximum power and non-linear increase in open circuit voltage with increasing irradiance level.The electrical characteristics of CdS/Cu2S solar cell under field conditions on the roof of the Faculty of Science, New Damietta were also investigated. The results indicate that The variation of short circuit current and open circuit voltage with irradiance and temperature influenced the output power of a solar cell.
The influence of temperature on the I-V characteristics of crystalline silicon solar cell (In/c-Si/Al) have been investigated. The short circuit current shows irregular linear increase with the rise in temperature and open circuit voltage illustrates a regular decrease with increase in temperature. The rate of increase of short circuit current is much greater than the rate of decrease of open circuit voltage and this leads to an increase in the maximum power of the cell.
The influence of particulates and gaseous pollutants on the electrical characteristics of crystalline silicon solar cell have been investigated for extended period of two months at Al-Harby street in Damietta city. The results indicate that the short circuit current is the dominant factor influencing the output power of a solar cell.
The influence of gamma-ray doses (1 and 1.25 kGy) on I-V and C-V characteristics of Au/ Fe(III)ClTPP /p-Si/Al solar cell have been investigated. The results indicate that the gamma radiation has a significant effect on the electrical and optical properties of the device. The results also indicate that Au/Fe(III) Cl TPP/p-Si/Al hetero- junction device can be applied as a gamma ray sensor.