A very thin region of static electric chargeThe 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 currentSee electric current. and thus a voltageThe amount of electromotive force, measured in volts, that exists... across the cell. Also called depletion zoneSame as cell barrier. The term derives from the fact... or space chargeThe process of adding electrical energy to a battery..