The first photovoltaic cells were created in 1954 and based on silicon. Early and widely available solar panels were called monocrystalline solar panels and involved growing a single silicon cell in a very complicated way, resulting in a small but costly panel. Somewhat cheaper but less efficient are the multicrystalline solar panels that involve an array of silicon cells made from wafers cut from a block of silicon. The most recent type produced is the amorphous solar panel, which silicon cells constructed between pieces of laminate, making it thin and flexible. The problem with the amorphous panels is that they are 40% less efficient due to their thinness.
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