HANK MORGAN / SCIENCE PHOTO LIBRARY HANK MORGAN / SCIENCE PHOTO LIBRARY
Close-up of circular, photovoltaic (solar) cells made from single-crystal silicon. Circular solar cells cut from an ingot of single-crystal silicon are more efficient than their rectangular relatives, which must be made from multi-crystal silicon. However, circular cells can cover only 70% of the area of a solar panel, whereas square cells can cover it completely. Solar cells absorb radiant energy from the sun and convert it into electrical energy.
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