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Photovoltaic cell research. Components of photovoltaic cells in a research laboratory. These components are the crystalline silicon layer (grey, upper left), an anti-reflection layer (blue, upper right), and the metal electrode layer (bottom). The latter conducts the electricity generated by the solar panel. Photographed in 2012, at the Claude-Delorme research centre of the Air Liquide company, Loges en Josas, near Paris, France.
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