beginning, solar energy used to be very expensive but the frontiers of energy technology have finally started to move forward and finally it is a global effort to promote it. Although the produced solar energy in 2006 was about only 0.4 %, due to its high cost , about 2.70$ per watt, the alertness for global warm and the excessive prices of fossil fuels, led to the emerging of solar industries. (Economist, 2008). The demand of the solar energy was determined by the incentives, like feed-in-tariffs, given…
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