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I am quite dubious that they actually produced a solar cell. Typically the good single crystal silicon ones get 0.5 V not 5 V. The physics here don’t make sense. These are really things that are better left to mass production.
Whioe you are most definitely right, it’s at least a starting point (even if it’s really ineeficient)
well mass production certainly is a great deal more energy efficient than individual production. But it is always useful for the magic of how things could be made to be revealed.
It’s a shame this doesn’t work for very long, the video description explains it stops working after several hours
