How charges are stored equally on both sides of a normal PN junction diode when it is reverse biased? For example if p side is connected to a -2 voltage supply and the N side being grounded ,won't the charge stored be more in the P side than in N?
Dear Mouleeswaran G.S ,
If you connect the positive electrode to the n-side and the negative electrode to the p-side, then the circuit is closed. It is said that the diode is reverse biased by a voltage equal to the battery voltage.
It is so that all the reverse voltage will be dropped on the transition region in the p-n junction. This voltage will be absorbed by widening the space charge region.
The space charge region itself is composed of an electric dipole.
Which means that the its positive charges = its negative charges.
I would like that follow the charge distribution in the p-n diode at the different biasing conditions in the book at the link:Book Electronic Devices
Best wishes
Hi Mouleeswaran G.S ,
the condition "not in a closed circuit" would mean that the positive terminal of the 2 V supply is unconnected. But then the pn junction is not reversed biased. Both terminals of the diode would be on ground potential, and the positive side of the supply on a potential +2 V above ground.
So, regarding the diode there is no difference between this setup and being completely unconnected. Generally, "biased" and "not in a closed circuit" are mutually exclusive.
Dear Mouleeswaran G.S ,
If you connect the positive electrode to the n-side and the negative electrode to the p-side, then the circuit is closed. It is said that the diode is reverse biased by a voltage equal to the battery voltage.
It is so that all the reverse voltage will be dropped on the transition region in the p-n junction. This voltage will be absorbed by widening the space charge region.
The space charge region itself is composed of an electric dipole.
Which means that the its positive charges = its negative charges.
I would like that follow the charge distribution in the p-n diode at the different biasing conditions in the book at the link:Book Electronic Devices
Best wishes
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