By the end of the century, scientists created a special type of solar cells that converted upwards of 36% of the sunlight it collected into usable energy. Solar energy conversion describes technologies devoted to the transformation of solar energy to other (useful) forms of energy, including electricity, fuel, and heat. In the early 1970s, solar cell technology became cheaper and more available ($20/watt). Solar cells started in 1876 with William Grylls Adams along with an undergraduate student of his.
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