solar cells solar cells are made of two types of silicon normal silicon has no free electrons n-type...
Post on 04-Jan-2016
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Solar Cells
• Solar cells are made of two types of silicon
• Normal silicon has no free electrons
• N-type silicon has been doped with phosphorus to give it extra electrons
• P-type silicon has been doped with boron to give it extra “holes” for electrons to be in
Semi-conductors and doping
N-type P-type
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N-type P-type
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Photons of light energy
• As more electrons on in the n-type silicon absorb photons of energy more can make the jump and move through the p-type silicon
• These moving electron cause a current to flow in a circuit connected as shown
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