As the world is
facing the problem of energy deficit, global warming and detoriation of
environment and energy sources, there is need for an alternative energy
resource for power generation other than use of fossil fuels, water and wind.
Fossil fuel get depleted in next few decades, hydro power plants are depends on
annual rainfall and wind power is also depends on climate changes. Solar energy
is one of the comparable candidate for alternate energy source. Solar energy is
a very inexhaustible source of energy. The power from the sun intercepted bythe earth is approximately 1.8×1011 MW which is larger than the present
consumption rate on the earth of all commercial energy sources.
Thus solar
energy could be supply all the present and future energy needs of the world on
a continuing basis. This makes it one of the most promising of the unconventional
energy sources. A solar cell is a device that directly converts the energy from
sunlight in to electrical energy through the process of photovoltaics. The
first solar cell was built around 1883 by Charles Fritts, who used junctions
formed by coating selenium (a semiconductor) with an extremely thin layer of
gold. In 2009, a thin film cell sandwiched between two layers of glass was
made. Read more...................
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