The semiconductor diode utilizes a N$-$type material and a P$-$type material. There is a junction barrier that is an electrostatic field, which has been created by the joining of both the $N$ and $P$ type materials. This electro$-$static field is usually called a barrier or depletion zone. If a battery is used to bias the PN junction and it is connected in such a way that the applied voltage opposes the junction field, it will have the effect of reducing the junction barrier and consequently aid in the current flow through the junction.

Identify the following locations: N$-$type, P$-$type, Cathode, Barrier$/$Depletion Zone, Battery, Anode

a$.$

b$.$

c$.$

d$.$

e$.$

f$.$