Thermally Generated Charge Carriers
- There are no free charge carriers at 0 oK in the pure silicon / Germanium. However, when the room temperature increases, some of the covalent bonds are broken by heat energy.
- This will result in electron – hole pairs are produced; it is called as thermally generated charge carriers.
- They are very small in quantity.
Holes and Electrons
- If acceptor type impurities are added to pure germanium, an intrinsic semiconductor is converted into P – type semiconductor.
- This will produce large number of positive holes and small number of thermally generated electrons. Finally, we can say that
- The P type semiconductor consists of greater number of holes than electrons.
- Therefore, it consists of holes as majority charge carrier and electron as minority charge carrier.
- Similarly, the N type semiconductor consists of electrons as majority charge carrier and holes as minority charge carrier.
Types of Material |
Majority charge carriers |
Minority charge carriers |
P type semiconductor |
Holes |
Electrons |
N type semiconductor |
Electrons |
Holes |
You may also like
:
Compare –
Distribution transformer and Power transformer
Standard kVA
rating of transformer
Technical specification of three phase transformer
No comments:
Post a Comment