09d9bdb1_den__Solar_Cells_Versus_Leaves__The_Solar_Cell
[0] Operation [The Leaf] The molecule chlorophyll absorbs a photon and looses an electron, causing a chain reaction that breaks apart water, releasing the chemical energy and a molecule of oxygen. At the same time the chemical reaction is used to break apart carbon dioxide, releasing the oxygen and using the extra carbon to create sugars. [The Solar Cell] 
The semiconducting silicone absorbs photons, creating extra electrons. The design of the solar cells forces these electrons to flow in one direction, creating a direct current through the solar cell.
Experiment Garden: Solar Cells Versus Leaves
The Solar Cell