Essay on Photovoltaic Cells as Sources of Clean Energy

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Photovoltaic – A sources of Clean Energy Abstarct- The aim of this work is a comparison of the merit and demerit of of different generation solar cells i.e. Single crystal silicon wafers (c-Si), Amorphous silicon (a-Si), Polycrystalline silicon (poly-Si), Cadmium telluride (CdTe), Copper indium gallium diselenide (CIGS) alloy, Nanocrystal solar cells, Photoelectrochemical (PEC) cells, Polymer solar cells, Dye sensitized solar cell (DSSC), Hybrid - inorganic crystals. Solar cells are becoming a mature technology. Solar cell provides clean energy. As it silently generates electricity and produces no air pollution or hazardous waste. Since there have been rapid advances in the efficiency and reliability of these cells, along with a…show more content…
Solar cells, or photovoltaic cells, transform light, usually sunlight, into electric current. Few power-generation technologies are as clean as photovoltaics (PV). Photovoltaic comes from the words photo meaning light and volt, a measurement of electricity. Sometimes photovoltaic cells are called PV cells or solar cells for short. As it silently generates electricity, PV produces no air pollution or hazardous waste. It doesn't require liquid or gaseous fuels to be transported or combusted as sunlight is free and abundant. Because PV systems burn no fuel and have no moving parts, they are clean and silent, producing no atmospheric emissions or greenhouse gases to cause detrimental effects on our water, air, and soil. Compared with electricity generated from fossil fuels, each PV-produced kilowatt eliminates up to 830 pounds of nitrogen oxides, 1,500 pounds of sulfur dioxide, and 217,000 pounds of carbon dioxide, every year, according to National Renewable Energy Laboratory (NREL) research. [1] In solar cells when photons of light fall on the cell, they transfer their energy to the charge carriers. The electric field across the junction separates II-TREDIIOAL SOLAR CELL PRINCIPAL A photoelectric effect First observed in 1839 (> 180 years ago) by French physicist A. E. Becquerel, (Becquerel effect : Ag ǁ Acid ǁ Pt) when sunlight was allowed to fall on one of two electrodes placed in an electrolyte. Practical device - In 1954, at the Bell Telephone Laboratories
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