-In the lifetime of solar cells and under normal operating conditions, electrical parameters of solar cells are degrading continuously because solar cells are ageing during outdoor exposure, which could deteriorate their electrical characteristics. In this paper, to simulate and accelerate the effects of aging, solar cells are exposed to the different doses of gamma radiation, since gamma radiation and aging produces similar effects in semiconducting devices. The electrical parameters of degraded silicon solar cells can be significantly recovered by ultrasonic treatment (UST). The restores of the silicon solar cells parameters such as efficiency (η), open circuit voltage (V oc ), short circuit current (I sc ), among other, after ultrasonic treatment is related to a redistribution of the radiation defects and an increase in the homogeneity of a solar cells crystal structure.
In this paper, to simulate and accelerate the effects of aging, solar cells were exposed to the different doses of co60 gamma radiation. The current–voltage (I–V) characteristics of mono-crystalline solar cells under AM1.5 illumination condition were studied before and after the gamma irradiation. Experimental results showed that the solar cell parameters such as open circuit voltage (Voc), short circuit current (Isc) and efficiency (η) decrease with the increase of the gamma radiation doses. The effect of subsequent thermal annealing on solar cells degraded by gamma irradiation is investigated. A significant improvement in the electric parameters of by low doses gamma irradiated silicon solar cells is observed after the thermal annealing.
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