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Ever since selenium was found to possess photoconductive properties, it has been used for many diverse applications in industry. Photoconductivity was discovered by William Adams and Richard Day in 1876.
They found that selenium produced an electric current when light was allowed to fall on it. The importance of this phenomenon was recognized by electrical scientists, in that it proved that light could be converted into electricity without the need for heat or machinery. This eventually led to the development of photovoltaic or solar cells.
The most important current non-biologic uses of selenium are: