List the classification of semiconductor ?

1. Intrinsic semiconductor
2. Extrinsic semiconductor
a. N-type semiconductor
b. P-type semiconductor

- Intrinsic semiconductors are pure semiconductors that do not contain any impurities. They have a very high electrical resistance and are not very useful for electronic devices.
- Extrinsic semiconductors are semiconductors that have been doped with impurities. Doping can increase the electrical conductivity of a semiconductor by adding either donor or acceptor impurities.
- N-type semiconductors are extrinsic semiconductors that have been doped with donor impurities. Donor impurities add electrons to the semiconductor, which increases its electrical conductivity.
- P-type semiconductors are extrinsic semiconductors that have been doped with acceptor impurities. Acceptor impurities remove electrons from the semiconductor, which decreases its electrical conductivity.