Electronics - Semiconductor Principles - Discussion

When p-type and n-type material are joined using allowing or diffusion technique owing to random movement to fill some holes as a result a depletion region is formed.

Good, Thanks for the explanation.

P-type material has +ve charge carriers (holes) and N-type has -ve (electrons). When they come together they attract each other and some electrons tend to go to p-side whereas some holes tend to go n-side.


As they travel towards junction electrons and holes combine together to neutralize and form ions. Formation of ions makes one narrow charged region on either side of PN junction. This junction is free from movable charge carriers and ions inside it are stationary and maintain a space between them without any charge carriers. This region is called as depletion region.

Its depletion region.

There is diffusion of charges across each other which results in a region of higher opposition to the diffusion of more charges. This is the depletion region.

Actually they leave +ve or -ve ions after movement from one side to other due 2 concentration gradient.

Because of concentration gradient the higher concentration carrier moves towards the lower concentration region hence they leave their parents atom and due to this the immobile ion form the region near the junction which is know as depletion region.