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The paper just says "an estimated energy density of >1 kW/m^2"

"Energy density" is a misnomer, it should be power density, since the kW is a unit of power (rate of energy generation), not energy.

That's quite an amount, about 3-5x the amount of energy generated by solar cells of the same surface area. It would mean the device would generate $2000-$4000 on a yearly basis.

Didn’t it say cubic meter, not square?

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