The consumption of fossil fuel has been increasing day-by-day and it is speeding up the rate of global warming. Thus the necessity for renewable energy sources became an important subject in order to slow down the rate of global warming. Several recently published reports showed that the solar energy in particular, photovoltaic systems play a major role in the transition from electricity production by fossil fuels to energy conversion by renewable energy sources. But the cost of the photovoltaic system is the main hurdle in achieving the mentioned goals. EU and German government reports show that the cost of photovoltaic system by 2030 will become significant. In 2050, it will amount to 20% and by the year 2100 solar energy will be the major energy source. The actual solar module, which converts sunlight into electricity, casts about 50% of the cost of a photovoltaic system. To reduce this cost thin film solar cells are of the alternative choice. Thin films can deposited with a cheaper, pure and on flexible substrates.
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