Question

Why there is no current in the reverse bias condition?

Answer 1

P-N junction diode: It is a device made by connecting a p-type semiconductor and an n-type semiconductor.

1. When it is connected in forwarding bias that means the positive terminal is connected to the p-type and the negative terminal to the n-type.
2. The majority of charge carriers in p-type are holes and in n-type is electrons, when it is in forwarding bias the depletion layer between p-type and n-type weakens and there will be a flow of holes and electrons.
3. In reverse bias thickening of the depletion layer occurs rather than making it difficult for electrons and holes to travel through it.
4. When the diode is reverse biased the majority of charge carriers are pushed away from the junction and more ions are left at the junction. This widens the depletion region.

Hence, reverse bias blocks the flow of electrons and holes, which in turn blocks the current flow.