I read that some diodes can be photovoltaic. I built a unit and noticed it did not work very well indoors. Outside in the bright sunshine it increased power maybe 20 times. I carefully shaded the various parts and sure enough, the power dropped drastically when I shaded the diodes. So unless I find something different, it sure seems that a solar cell put out thousands of times more power and costs less and no need to build any circuit.
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