Abstract
ABSTRACT The present study tackles the effect of He – Ne laser light on the electric characteristics and the performance of Si - solar cell. A He – Ne laser light of (λ = 632.8 nm) wavelength and (1mW) power has been used to irradiate the solar cells in two modes: continuous wave (cw) and discontinuous at chopper frequency (25 Hz) at different periods of time of irradiation. Measurements of I–V at experimental solar radiation intensity of (40.6 mW/cm2) have been made at room temperature. In these measurements the short circuit current (Isc), the open circuit voltage (Voc), and the fill factor (FF) have been studied, then the efficiency of the solar cell has been found. The results have shown that the solar cells irradiation by the continuous laser light led to inconsistent increase in the values of cell performance parameters, i.e. the value of Isc is higher than its original value before irradiation, in addition to the increase in the cell efficiency as the time of irradiation increases. On the contrary, we have noticed that these values have increased when the cells are irradiated by the discontinuous laser light.
