p-type semiconductor
- When trivalent impurity like indium,boron, aluminium etc is added to pure semiconductor , p-type semiconductor is formed.
- Electric conductivity is due to positively charged holes.
- Impurity atoms are called as acceptor impurity
- Holes are majority charge carriers
- Since holes are in majority and they are positive in charge hence it is named as p-type semiconductor
n type semiconductor
- When pentavalent impurity like arsenic, antimony , phosphorus etc is added to pure semiconductor , n-type semiconductor is formed.
- Electric conductivity is due to negatively charged electrons
- Impurity atoms are called as donor impurity
- Electrons are majority charge carriers
- Since electron are in majority and they are negative in charge hence it is named as n-type semiconductor
