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.

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Presentation transcript:

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-typeP-type e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e-

N-typeP-type e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e- 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