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Timeline for Thin Film Solar Cell

In 1841, Edmund Becquerel, the son of a physicist and the father of another one, generated electricity by illuminating an electrode with different types of light, including sunlight
Beckuerel experiment
In 1875, American, G.R. Carey invented the phototube. The light-sensitive photo-cathode consist of a thin film. Under illumination, low work-function metals, such as cesium, will release energetic electrons from the cathode.
photo cell

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