Photovoltaic panel pn junction location
A solar cell's core is a p-n junction, an interface between p-type and n-type semiconductor materials. This junction creates a built-in electric field in a depletion region. When photons with sufficient energy strike the semiconductor, they create electron-hole pairs. This electric field is the MOST important part of a. . To understand photovoltaic devices and these other energy conversion devices, we need to understand pn junctions. [pdf]