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What type of solar cell is the Cuprous Oxide-Copper cell? Can you tell me how it works?

On scitoys.com, a solar cell made from Cuprous Oxide and Copper is described, but the explanation is made for a middle-schooler. I keep researching how how the solar cell would work but can’t get a explanation good enough for a high-school level science exposition. thanx in advance.

The cell works the same as a silicon wafer or any other solar cell.

When photons strike the surface, an electron in the Cu(II) oxide plate is promoted to a higher electronic state in the conduction band,

Being attached to free Cu, electrons in thier conduction band allows the electrons mobility and flow as current when there is a circuit load. Drawing off this current leaves holes n the Cu conduction band.

See. Electrons in the atoms of each material reside in bands, much like the floors in a “two story” building with a flat roof. When light strikes the electrons, they gain energy and are promoted to the roof, where they can move around (conduction) . siphoning off these electrons (electrical load) leaves more room on the roof, for more electrons to be promoted from below.

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