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(A) 1. 2. 6. Solar Electric Technologies (Photovoltaic) Energy source and solar electric (PV) technologies By far the most important energy source for all life on earth is the sun. Its energy is generated deep in its interior by nuclear fusion reactions, is carried to the surface we can see in the daytime sky by high-energy radiation and convection and then to Earth and down through our atmosphere by sunlight, that is electromagnetic radiation primarily in the visible and infra-red. The sun also emits some ultra-violet light and high-energy particles, but the major fraction of the solar energy reaching the earth’s surface is just visible and near-infra-red light. The energy content of the sunlight reaching the earth is some hundred thousand times bigger than mankind’s total current energy use and solar photovoltaic (PV) technology simply aims to use some of this torrent of free energy to make electricity. As far back as 1839 Becquerel demonstrated a link between light and electricity, but effective solar cells that could convert light into electricity became possible only after the development of semiconductor diodes and transistors in the 1930s and 1940s. In 1955 the US Bell Labs patented a solar cell based on silicon, creating what has proved to be the most important solar cell technology so far and enabling an understanding of their operation to be gained which has guided the development of cells based on other 93PDF Image | Economic Perspectives of Renewable Energy Systems
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