Kind of makes you wonder how well they’d work on say... the Moon for a permanent habitat. Breaking down water in the lunar regolith and using it for power and oxygen would seem to be pretty darn handy.
The only problem there is longevity. You are also subjecting the solar cell to unshielded cosmic rays which will damage the cell. Also on the moon you have the problem of a source of water. The say there is water at the poles but you have to transport the water to the equator where the sun is the strongest.
Another problem on the moon is that half the month the cell is in darkness.