When the P-region or Anode of the diode is connected to the negative terminal of the external DC source and N-region or Cathode of the diode is connected to the positive terminal of the external DC source. At that time we can say that the Diode is in "Reverse Biased" condition.
The Reverse Biased condition is indicated in the Fig.15a.
Fig.15a
When a diode is reverse biased, holes in the p-regions are attracted towards the negative terminal of the external DC supply and electrons in the n-regions are attracted towards the positive terminal of the external DC supply.
Due to movements of electrons and holes away from the junction, "the width of the depletion region increases". This happens due to the creation of the more numbers of immobile ions.
Due to more numbers of immobile ions opposite the junction, "the barrier potential will increase".
We know that the p-region consists of a small number of electrons and n-region consists of a small number of holes. These minority charge carriers get some thermal energy and crossed the junction and produce some current.
This current is know as "Reverse Saturation Current" Which indicated in Fig.15b.
Fig.15b
The Reverse Biased condition is indicated in the Fig.15a.
Fig.15a
When a diode is reverse biased, holes in the p-regions are attracted towards the negative terminal of the external DC supply and electrons in the n-regions are attracted towards the positive terminal of the external DC supply.
Due to movements of electrons and holes away from the junction, "the width of the depletion region increases". This happens due to the creation of the more numbers of immobile ions.
Due to more numbers of immobile ions opposite the junction, "the barrier potential will increase".
We know that the p-region consists of a small number of electrons and n-region consists of a small number of holes. These minority charge carriers get some thermal energy and crossed the junction and produce some current.
This current is know as "Reverse Saturation Current" Which indicated in Fig.15b.
Fig.15b
The End.
Also look out;
Post-13 Biasing Of A P-N Junction Diode(With External Bias)
Post-14 How P-N Junction Diode Is Work In Forward Biasing ?
God Bless Thx..........
Post-13 Biasing Of A P-N Junction Diode(With External Bias)
Post-14 How P-N Junction Diode Is Work In Forward Biasing ?
God Bless Thx..........
