09d9bdb1_den__Solar_Cells_Versus_Leaves__The_Solar_Cell
[0] Physical Makeup [The Leaf] Most leaves are made from silicon, phosphorus, chlorine, sulphur, potassium and calcium. [The Solar Cell] 
Solar cells are made almost entirely out of silicon, with other metallic elements added.
Experiment Garden: Solar Cells Versus Leaves
The Solar Cell