electrons across the junction. This occurs as follows. As electrons continue to diffuse
across the junction, more and more positive and negative charges are created near the junction
as the depletion region is formed. A point is reached where the total negative charge in
the depletion region repels any further diffusion of electrons (negatively charged particles)
into the p region (like charges repel) and the diffusion stops. In other words, the depletion
region acts as a barrier to the further movement of electrons across the junction.