They're sliced from a single, pure silicon crystal, which gives them that sleek, uniform black look and often a clipped, octagonal shape. Because the crystal structure is so pure, electrons can move around more freely, which means higher efficiency. . Solar Cell Definition: A solar cell (also known as a photovoltaic cell) is an electrical device that transforms light energy directly into electrical energy using the photovoltaic effect. Solar cells are sandwiched between layers of semi-conducting materials like silicon. The most crucial component of the solar panels is the photovoltaic (PV) cells. .
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