Why does the width of depletion region is small in highly doped diode?

[Viswanathan.M]

Dear,
In Zener Diode, In highly Doped diode,the breakdown(Zener breakdown) occurs in small voltage.How?
Thanks& Regards,
Viswanathan.M

 

[uart]

In Zener Diode, In highly Doped diode,the breakdown(Zener breakdown) occurs in small voltage. How?

The higher is the doping level then the narrower is the depletion region for any given reverse bias voltage. A narrower depletion region means that voltage is "blocked" over a shorter distance, meaning that the peak electric field is higher.