IBM claims that their thin-film photovoltaic cell is indeed the world’s most efficient solar cell, operating at 9.6 percent efficiency. This is not the most efficient solar cell in existence, but it does hold the record for the most efficient solar cell made from inexpensive materials such as copper, tin and zinc. In 2009, a team from the University of New South Wales in Australia developed a prototype of a solar cell with record-breaking efficiency using a silicon cell to capture light at near infrared ends of the spectrum, achieving a conversion of 43 percent of sunlight into electricity.
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