EFFECT OF DUST WITH DIFFERENT PHYSICAL-PROPERTIES ON THE PERFORMANCE OF PHOTOVOLTAIC CELLS

The effect of accumulation of dust and particulate matter onto the sur face of photovoltaic cells has been experimentally investigated. Five kinds of dust having different physical properties were used. Three of them were limestone particulates with different classes and the other two were cement and carbon particulates. Details on the physical prop erties of each were obtained through size distribution analysis using an optical microscope. Well-controlled experiments were conducted usin g a solar simulator as a light source. The dust deposition density (g/ m(2)) was precisely determined in each test run. It has been concluded that fine particulates significantly deteriorate the performance of p hotovoltaic cells, more so than coarser particles. Cement, the main bu ilding material which may often present in the atmosphere of urban are as has shown to reduce both the short circuit current and output power when deposited onto the surface of photovoltaic cells. This is due to the very small diameter of its particles. Carbon particulates, which are generated from combustion process and emitted from diesel engines among the different dusts used, have shown to result in the worst dete rioration of performance of photovoltaic cells, and higher a loss in p ower output.