Dark, gamma-induced conductivities and conductivity modulation in silicon material will be investigated for the development of carrier lifetime measurement. The present work includes a simple method for finding the carrier lifetime variation from the measured conductivity under dark and gamma irradiation conditions. It will be concluded that an improved material evaluation in the area of semiconductors and nano-materials are expected to improve the efficiency of solar cells and other opto-electronic devices.
The ultraviolet UV solar radiation flux is monitored over a fixed time interval to study the daily, monthly and annual variations for a nearly one decade in Riyadh. Mathematical expressions will be presented based on a comparison between theoretical and experimental values. It is believed that the present analysis of UV radiation suggest that the environmental effects led to a better understanding of UV scattering, UV reflection, ozone and clouds layers in Riyadh and other selected areas in the mid-east region.
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