Contents
What is avalanche effect in Zener diode?
Avalanche effect is “the sudden rapid increase in the current in a non conducting material (insulator) or semiconducting material (semiconductor) when a sufficient amount of electrical force is applied to the material”. The device used for this avalanche effect (zener effect) is called zener diode.
What is the effect of Zener diode?
The Zener effect is a type of electrical breakdown that occurs in a reverse-biased PN junction when the electric field enables tunnelling of electrons from the valence to the conduction band of a semiconductor, leading to a large number of free minority carriers which suddenly increase the reverse current.
Which breakdown has a sharp curve?
Zener breakdown
Difference between Zener breakdown and Avalanche breakdown
| Parameters | Zener breakdown |
|---|---|
| Graph curve | It has a sharp curve |
| Mechanism | It occurs because of the high electric field |
| Tunneling effect | Tunneling effect takes place |
| Doping concentration | The doping concentration is high at the junction |
At which voltage zener breakdown occurs?
Zener breakdown voltage is found to occur at electric field intensity of about 3×107 V/m. Zener breakdown occurs in heavily doped junctions (p-type semiconductor moderately doped and n-type heavily doped), which produces a narrow depletion region.
At which voltage Zener breakdown occurs?
What causes an avalanche breakdown in a Zener?
The Avalanche breakdown happens when a high reverse bias voltage increases the electric field, which further expands up the depletion region. The important difference between Zener breakdown and Avalanche breakdown
How does avalanche breakdown and PN junction break?
The Avalanche Breakdown and Zener Breakdown are two different mechanisms by which a PN junction breaks. The Zener and Avalanche breakdown both occur in diode under reverse bias.
When does a Zener breakdown occur what happens?
The Zener breakdown occurs when the high electric field is applied across the PN junction diode. This results in the flow of electrons across the PN-junction. What is Avalanche breakdown?
What’s the difference between avalanche breakdown and avalanche breakdown?
The temperature coefficient of the Zener is negative whereas the avalanche is positive. The breakdown voltage (Vz) of the Zener is inversely proportional to temperature (ranges from 5v to 8v) whereas the avalanche is directly proportional to temperature (Vz > 8V).