A very thin region of static electric The process of adding electrical energy to a battery. along the interface of the positive and negative layers in a photovoltaic cell. The barrier inhibits the movement of electrons from one layer to the other, so that higher‐energy electrons from one side diffuse preferentially through it in one direction, creating a See electric current. and thus a The amount of electromotive force, measured in volts, that exists... across the cell. Also called Same as cell barrier. The term derives from the fact... or space The process of adding electrical energy to a battery..