In the 19th century, it was observed that the sunlight striking certain materials generates detectable electric current – the photoelectric effect. This discovery laid the foundation for solar cells. Solar cells have gone on to be used in many applications. . Long before the first Earth Day was celebrated on April 22, 1970, generating awareness about the environment and support for environmental protection, scientists were making the first discoveries in solar energy. With the way the cost of solar has plummeted in the past decade, it's easy to forget that going solar. . The true potential of solar energy began to be realized with the discovery of the photovoltaic effect in the 19th century.
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