The importance of renewable energy sources

Today’s political considerations to move the world’s energy consumption away from fossil fuelssuch as oil, coal and gas has increased the focus on renewable energy . Renewable energy isperceived as a sustainable solution to ensure future energy supply as well as being carbondioxide emissions free or neutral. Solar energy is by far the renewable energy source with thegreatest potential . It has the ability to cover the world’s energy demand several thousand timesover and, unlike fossil fuels, solar energy is readily available world-wide. solar cells arecommonly used in remote regions with no access to the power grid or in private homes as agreen alternative to fossil fuels. As a result a mere ۰.۰۴ % of the world’s energy supply camefrom solar photovoltaics in ۲۰۰۶ [۱۰]. Solar cells are generally divided into two categories: ۱-conventional, ۲- dye-sensitized and polymer. In this article, an attempt is made to introduce solarcells as a clean and renewable energy in order to take a positive step towards more use of thisnew energy.

Keywords:

electron , organic-inorganic solar cells , photon