Most solar cells are made out of silicon due to its low cost and relative efficiency; however, limits to the material's overall efficiency have led to researchers experimenting with new materials, including ferroelectric crystals.
One of the benefits of ferroelectric crystals is that they do not require a pn junction, meaning no positively and negatively doped layers — as is the case with silicon solar cells.
More on ferroelectric crystals and solar efficiency below
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