The phenomenon that occurs when photons, the “particles” in a beam of light, knock electrons loose from the atoms they strike. When this property of light is combined with the properties of semiconductors, electrons flow in one direction across a junctionA region of transition between semiconductor layers, such as a..., setting up a voltageThe amount of electromotive force, measured in volts, that exists.... With the addition of circuitry, currentSee electric current. will flow and electric power will be available.
