Jun 232015
 
Placing a lit candle next to bars of selenium, British scientists, William Grylls Adams and Richard Evans Day, 140 years ago, discovered that selenium could transform light directly into electricity. Reading about their results, American inventor Charles Fritts put together the first photovoltaic array on a New York rooftop in 1884. He optimistically predicted that soon his modules would compete in the market with the new electric power plants established by Thomas Edison. But the science of...

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