Mahdi Alinaghizadeh Ardestani - Faculty Member, electical Engineering, Technical and Vocational University (TVU), Tehran, Iran
Zhila Mohammadi - P.H.D, Department of Basic Sciences, , Technical and Vocational University (TVU), Tehran, Iran

Today’s political considerations to move the world’s energy consumption away from fossil fuels such as oil, coal and gas has increased the focus on renewable energy . Renewable energy is perceived as a sustainable solution to ensure future energy supply as well as being carbon dioxide emissions free or neutral. Solar energy is by far the renewable energy source with the greatest potential . It has the ability to cover the world’s energy demand several thousand times over and, unlike fossil fuels, solar energy is readily available world-wide. solar cells are commonly used in remote regions with no access to the power grid or in private homes as a green alternative to fossil fuels. As a result a mere ۰.۰۴ % of the world’s energy supply came from 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 solar cells as a clean and renewable energy in order to take a positive step towards more use of this new energy.

electron, organic-inorganic solar cells, photon