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Re: gEDA-user: Depletion zone

On 11/24/06, Karel Kulhavy <clock@xxxxxxxxxxxxx> wrote: 
But electrons and holes attract and they should be attracted together and
refill the depletion zone again. Why doesn't this happen?


With no voltage applied to the diode, that's precisely what happens.
BTW, this is why there is a 0.65V drop across silicon diodes; you have
to overcome the internal attraction before the diode will function as
anything but a capacitor.

When the diode is reverse biased, however, the EMF from the applied
voltage is orders of magnitude greater than the EMF created from
mutual attraction; thus, the effects of the attraction is essentially
nullified.

--
Samuel A. Falvo II


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