Isn't there a group (I think working from a university in California, not sure though) that is able to synthesize crystals in different colors to collect even more of the spectrum. Then they just layer them on top of each other, and you have something like a %70 efficiency(Maybe it was higher, can't remember) the only reason they aren't being used is because there are too many flaws when synthesizing them, but the actual material exists, it's just a matter of perfecting it now.
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Isn't there a group (I think working from a university in California, not sure though) that is able to synthesize crystals in different colors to collect even more of the spectrum. Then they just layer them on top of each other, and you have something like a %70 efficiency(Maybe it was higher, can't remember) the only reason they aren't being used is because there are too many flaws when synthesizing them, but the actual material exists, it's just a matter of perfecting it now.