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Solar Cells

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Rural Technology

The solar radiation falls on solar cells which converts sun light directly into electricity. Some solid materials like semiconductors generate free electrical charges upon absorption of a photon from sun light.

Most solar cells are made from silicon; Silicon cell has property of both a conductor and an insulator. Atoms in a metal have loosely bound electrons that flow easily when a voltage, or electrical pressure, is applied. Atoms in an insulator have tightly bound electrons that cannot flow even when a strong electric voltage is applied.

Atoms in a semiconductor bind their electrons somewhat more tightly than metals, but more loosely than insulators( Intermediate arrangement of the electrons).

When light falls on semiconductors , electrons starts flowing in semiconductors, that is current. In order to get the desired voltage and current, solar cells are connected in series - parallel arrays is called ‘solar panel’.

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