Does any current flow in reverse PN junction?

[Dembie]

Homework Statement

Homework Equations

[/B]
When a diode is reverse biased positive donor ions are left in the N semiconductor and negative acceptor ions in the P type. And since the N is conected to + and its donnor ions has a large +charge, why no electrons from P cannot cross the junction and move to the +of the battery?

The Attempt at a Solution

 

[CWatters]

Have a read..
http://www.science-campus.com/engineering/electronics/semiconductor_theory/diode_2.html

 

[Dembie]

Have a read..
http://www.science-campus.com/engineering/electronics/semiconductor_theory/diode_2.html

Ty mate, but that doesn't answer the question why since on one side a large +charge from the donor ions is building , why it just not pull some of the electrons from the acceptor ions into the N region

 

[CWatters]

There is some reverse current but it's very small because it's the minority carriers involved. For example in the P-type material the majority charge carriers are holes. It's better to think of electrons that are injected from the -ve as reducing the number of holes available making it less conductive, rather than being free electrons able to go across the barrier.

https://en.wikipedia.org/wiki/Reverse_leakage_current

 

[Dembie]

There is some reverse current but it's very small because it's the minority carriers involved. For example in the P-type material the majority charge carriers are holes. It's better to think of electrons that are injected from the -ve as reducing the number of holes available making it less conductive, rather than being free electrons able to go across the barrier.

https://en.wikipedia.org/wiki/Reverse_leakage_current

I get it now, thank you for ur answers:-)