What will happen if PN regions are heavily doped in zener diode?

If PN regions in a Zener diode are heavily doped, the breakdown voltage decreases due to the increased electric field strength at the junction. This heavy doping leads to a thinner depletion region, allowing the Zener breakdown to occur at lower voltages. Consequently, such a Zener diode can effectively regulate voltage at a specified lower level, making it suitable for low-voltage applications. However, excessive doping may also affect the diode's stability and performance characteristics.