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700BC 1700's 1900's 1920's 1950's 1960's 1970's 1980's 1990's
1904
Wilhelm Hallwachs discovers that a combination of copper and cuprous oxide is photosensitive.
1905
Albert Einstein publishes his paper on the photoelectric effect, along with a paper on his theory of relativity.
1908
William J. Bailley of the Carnegie Steel Company invents a solar collector with copper coils and an insulated box, which is roughly the same collector design used today.
1914
The existence of a barrier layer in photovoltaic devices is noted.
1916
Robert Millikan provides experimental proof of the photoelectric effect.
1918
Polish scientist Jan Czochralski develops a way to grow single-crystal silicon.
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