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Characteristics of a Photovoltaic Cell Henri Becquerel was the first man to associate the production of electricity with light. Seeing that many materials in a circuit reacted to light with varying amounts of electricity, in 1839 he coined the expression 'photovoltaic': 'photo' for light and voltaic for 'voltage'. Photovoltaic cells work by converting light energy into 'Electromotive force' (EMF) or Voltage in a circuit. The solar cell is the most important component in a photovoltaic device and is made of silicon. The semiconductor in the solar cell can be used for generating electricity. By placing such cells in panels, enough energy can be created for practical use. First used practically used in the development of spacecraft, it was the energy crisis of the 1970s that extended its use across the market. How Do They Generate Electricity? Using the principal of 'Band Gap theory' scientists realised that by introducing controlled amounts of...

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