'Fool's gold' aids discovery of new options for cheap, benign solar energy

Pyrite, better known as "fool's gold," was familiar to the ancient Romans and has fooled prospectors for centuries -- but has now helped researchers discover related compounds that offer new, cheap and promising options for solar energy. These new compounds, unlike some solar cell materials made from rare, expensive or toxic elements, would be benign and could be processed from some of the most abundant elements on Earth.

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