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Thin-film solar cells based on Cu(In, Ga)Se2 chalcopyrite materials have achieved record power conversion efficiencies (PCE) above 22%, higher than any other thin film technology. Here, a proof-of-principle for Cu(In, Ga)Se2 solar cells with a reduced materials consumption by a factor of ~100 is demonstrated for which simulations indicate an even higher PCE potential. The concept is based on using...
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