Question
What is a p-n junction? How is a p-n junction made?
Solution
When a p-type semiconductor crystal and an n-type semiconductor crystal is brought in close contact, the resulting arrangement so formed is p-n junction.
Formation of p-n junction:
1. Silicon crystals are cut into thin slices of wafer to form an n-type and p-type.
2. Now, an aluminium film is placed on a wafer of n-type silicon and, is heated to a high temperature of about ~580o C such that, aluminium diffuses into silicon.
3. Hence, as a result of the diffusion a p-type semiconductor is formed on an n-type semiconductor. This formation of p-region on an n-region is called a p-n junction.
Formation of p-n junction:
1. Silicon crystals are cut into thin slices of wafer to form an n-type and p-type.
2. Now, an aluminium film is placed on a wafer of n-type silicon and, is heated to a high temperature of about ~580o C such that, aluminium diffuses into silicon.
3. Hence, as a result of the diffusion a p-type semiconductor is formed on an n-type semiconductor. This formation of p-region on an n-region is called a p-n junction.
