Solar cell

Solar cell

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Credit: ALFRED PASIEKA/SCIENCE PHOTO LIBRARY

Caption: Solar cell. Close-up of the surface of a solar (photovoltaic) cell, which converts light into electrical energy. The cell is made from silicon (blue), a semi-conductor. Because the silicon is a semi-conductor, the energy of photons of light is enough to release electrons from the silicon. The electrons are collected through a grid of wires (white), forming an electrical current. This cell contains numerous small silicon crystals, and so is called a polycrystalline (amorphous) cell. It is less efficient than a single-crystal cell, but is far cheaper to manufacture. Solar power is an environmentally-friendly energy source and does not pollute or use up limited resources.

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Keywords: alternative, apparatus, cell, close-up, device, electrical, energy, engineering, environmentally friendly, equipment, green, macrophotograph, materials science, photovoltaic, power, semiconductor, silicon, solar, technological, technology, wire, wires

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