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Charles Fritts (1850 – 1903〔according to Marius Paulescu and others Weather Modeling and Forecasting of PV System Operations, Springer Verlag 2013, S. 1〕) was the American inventor credited with creating the first working Selenium Cell in 1883. Fritts coated the semiconductor material selenium with an extremely thin layer of gold. The resulting cells had a conversion electrical efficiency of only about 1% owing to the properties of selenium, which in combination with the material's high cost prevented the use of such cells for energy supply. Selenium cells found other applications however, for example as light sensors for exposure timing in photo cameras, where they were common well into the 1960s. Solar cells later became practical for power uses after Russell Ohl's 1941 development of silicon p/n junction cells that reached efficiencies above 5% by the 1950s/1960s. Today's best silicon solar cells are over 40% efficient, with industrial average over 17%.〔(Microsoft Word - PV Report 2006.doc )〕 ==See also== *Timeline of solar energy 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Charles Fritts」の詳細全文を読む スポンサード リンク
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