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Solar energyWithin the next ten years there will be an enormous progress in the bionics of the plant area . As model the page of a plant serves. In the biology instruction you learned that the Chlororplasten in the pages of the plants make from the light falling on the pages with water and Co2 sugar and strength. The strength and the sugar are the energy suppliers of the plants. With a solar cell from silicon electricity is produced. The best cells have an efficiency of approx. 20 - 25%. The page of a plant has an efficiency of up to 40%. Thus almost doubles as much as an artificial cell. 1991 one created an almost transparent and more pollution free solar cell. This had an efficiency at that time an efficiency of 7% and; with cloudy sky an efficiency even more than doubly as much than a silicon cell.
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Left is the Graetzel solar cell shown. It is divided in five layers. A glass plate with a conductor layer as cover, then iodine, a coloring material to absorbing the blue and red light beams, a layer titanium dioxide and finally again a glass plate with a conductor layer.
On the conductor layers the produced electricity is led for a link. Then it can be used by a lamp or electrical things. The three internal layers carry the chief work out for electricity production. 
