1. The problem statement, all variables and given/known data I've been reading and I just want to make sure that this is the correct way which pv cells work, I feel this is not correct. I want to find where I am wrong. Once the p and n doped semiconductors are put together some carriers migrate and combine to form a depletion zone and have buildup of opposite ion charges. Now when a photon with enough energy hits an electron that is across the depletion zone (black photon) the photon has sufficient energy to cross the zone, following the electric field over to where the majority electron carriers are (we hope that it doesn't recombine with the positive holes) and if it successfully reaches the other side it flows across the wire? Also I added the brown photon, I assume this ehp just gets recombined. 2. Relevant equations http://pveducation.org/pvcdrom/solar-cell-operation/light-generated-current [Broken] edit* the red circle was an electron, so I believe my diagram is correct! 3. The attempt at a solution http://imageshack.us/photo/my-images/854/pnjunction.png tried to draw a diagram. Wouldn't mind drawing a few more so that I can understand fully.