MARTIN BOND / SCIENCE PHOTO LIBRARY MARTIN BOND / SCIENCE PHOTO LIBRARY
Solar cells. Array of solar cells (photovoltaic cells) on the side of a building. The cells contain a semiconducting material which converts sunlight directly into electricity. Solar power is a renewable, inexhaustible source of energy and does not contribute to global warming. In the foreground, leafy branches of trees can be seen. The function of these leaves is analogous with solar cells in that it is to convert solar energy into a usable energy form. In the case of the leaves, the solar energy is converted into the chemical energy needed for photosynthesis. Photographed at the Union Bank of Switzerland building near Lugano, Switzerland.
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