Solar power is the dominant technology in the renewable energy field, primarily due to its high efficiency and cost-effectiveness. By the early 1990s, photovoltaic conversion had reached an unprecedented new height. Solar energy conversion describes technologies devoted to the transformation of solar energy to other (useful) forms of energy, including electricity, fuel, and heat. It covers light-harvesting technologies including traditional. Solar cells started in 1876 with William Grylls Adams along with an undergraduate student of his. A French scientist, by the name of, first discovered the in the summer of 1839.