Addition of trivalent impurity to a pure semiconductor creates many________
Addition of trivalent impurity to a pure semiconductor creates many________
Right Answer is:
Holes
SOLUTION
The addition of trivalent impurity to a pure semiconductor creates many holes.
Detailed Explanation
- P-Type material is formed when silicon or germanium crystal is doped with (added with) a small percentage of trivalent impurity material like boron, gallium or indium.
- Although the amount of impurity material added is small, the total number of atoms being large produce a large number of holes in the crystal.
- Thus a p-type material will have plenty of holes and an n-type material will have plenty of free electrons.
- Electrons and holes constitute charge carriers. In a p-type material, the holes are the majority charge carriers.
- When the temperature is raised there will be the creation of free electrons and holes. These thermally generated electrons will be the minority charge carriers because of their being small in numbers.