Question

Depletion layer across a PN junction lies_____ in P region and_______ in N region
1. less, more
2. wholly, nothing
3. more, less
4. equal, equal

Answer 1

Correct Answer - Option 1 : less, more

CONCEPT:

• The material which is not a good conductor or a good insulator is called a semiconductor. For example Silicon, Germanium, etc.
• The semiconductor device which is used to control the flow of electric current is called a p-n junction diode.
• The depletion region/layer is an area at the junction where a field is formed because of the formation of a negative charge layer on the p side and a positive charge layer on the n side.
   

EXPLANATION:

• The holes and electrons formed because of doping or impurities, diffuse to the other side respectively.
• So when a hole diffuses across the junction, it leaves a negative donor ion and the electron leaves a positive charge on the n side.
• These oppositely charged layers form a field due to the potential difference between the points which form the depletion region.
• All of the stated points contribute to the formation of the depletion region at the junction.
• The depletion layer across a PN junction lies less in the P region and more in the N region.