Question

Which of the following statements are correct with respect tosemiconductors?

1. Holes are charge carriers in p-type semiconductors.
2. The addition of group 5A elements to group 4A semiconductorsincreases the conductivity of the group 4A semiconductors.
3. Electrons are charge carriers in n-type semiconductors.
4. The conductivity of semiconductors can be increased by thedoping process.
5. The addition of group 3A elements to group 4A semiconductorsdecreases the conductivity of the group 4A semiconductors.
6. As the temperature increases, the conductivity of semiconductorsdecreases.