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Solar Energy
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Overall, solar is one of the cleanest energies for the environment. Solar cells are usually made from silicon, which is basically sand. The silicon is doped with phosphorus to create the N-type, or negative layer, which is the top layer. The bottom layer of silicon is doped with boron which creates the P-type, or positive layer. When the sun hits the N-type layer it knocks electrons free to flow from the n-type layer to the p-type layer. In doing this an electic current is made. String enough solar cells together and voila, you can power anything.
