I'm reading about short circuit current in a solar PV cell and I am a little confused. The short circuit current is defined as the current across the solar cell when there is zero potential difference across the cell. At this point the short circuit current is equal to the light current. What I'm confused about is that there is an inherent potential difference built into the solar cell, right? As holes and electrons diffuse across the P-N Junction of the solar cell a potential difference builds up, lending way to an electric field. This electric field is what pushes the electrons and holes in their respective directions once the material is struck by an incoming photon. This is motion of electrons and holes is the light current. So there has to be a a potential difference across the cell for there to be any light current, correct? Does the short circuit current occur when there is a zero APPLIED potential difference? Any help that could be offered would be great.