Can We Power Everything With Solar Panels?

Solar panels are the future of energy efficiency, but it’s their price tag that has people second guessing. Have scientists found a way to make them cheaper?

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UNSW researchers convert sunlight to electricity with over 40 percent efficiency
http://www.eurekalert.org/pub_release...
“UNSW Australia's solar researchers have converted over 40% of the sunlight hitting a solar system into electricity, the highest efficiency ever reported. The record efficiency was achieved in outdoor tests in Sydney, before being independently confirmed by the National Renewable Energy Laboratory (NREL) at their outdoor test facility in the United States.”

DARPA pushes for 50% efficient photovoltaics to power soldiers' small tools
http://spie.org/x8772.xml
“Photovoltaic solar cells already provide the armed forces with portable power supplies. But with their present low efficiency, a 60W laptop recharger would require more than 0.37m2 of solar cells.”
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