Silicon for solar cells: Relatively pure, polycrystalline, and photoactive silicon was directly obtained from silicon dioxide nanoparticles (NP) by electrodeposition in molten CaCl2 salt on a silver electrode (see picture). This process is based on the formation of liquid droplets of a silver–silicon eutectic alloy and the continuous reduction of SiO2 to silicon. The deposited silicon shows a p-type behavior in photoelectrochemical measurements.
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