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Amorphous and Thin-Film Silicon
Amorphous silicon (a-Si) was heralded as the "only" thin-film PV material in the 1980s; a decade later, many people wrote it off for its instability and low efficiencies. Multijunction cell configurations have helped solve these problems. In the near term, look for modules with 6% to 8% efficiencies, as well as the construction of multi-megawatt a-Si facilities.
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