Comparison between zener breakdown and avalanche breakdown

S.NO	Zener breakdown	Avalanche breakdown
1.	Breakdown is due to strong electric field developed across the narrow depletion region.	Breakdown is due to charge multiplication
2.	Observed if Vz > 6 volt	Observed if Vz < 6 volt
3.	The VI characteristics is very sharp with zener breakdown	The VI characteristics is not very sharp with avalanche effect
4.	The breakdown voltage decreases as junction temperature increases	The breakdown voltage increases as junction temperature increases
5.	It occurs in heavly doped diodes	It occurs in normally doped diodes