What do you mean by the contact potential? Give a schematic of a p-n Junction by illustrating:

• (a) Potential difference V, resulting from the positive donor ions in the n-side of the depletion layer and the negative acceptor ions in the p-side of the depletion layer.
• (b) Potential energy barrier faced by the majority charge carriers (electrons) in the n-side of the diode as they attempt to cross the junction.
• (c) Potential energy barrier faced by the majority side of the diode as they attempt to cross the junction.