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Chapter 20: Problem 15

Avalanche breakdown is due to (A) Collision of minority charge carrier (B) Increase in depletion layer thickness (C) Decrease in depletion layer thickness (D) None of these

Short Answer

Expert verified
The correct answer is (D) None of these, as none of the given options directly describes the concept of avalanche breakdown. Avalanche breakdown occurs due to a strong electric field, causing free electrons to gain enough energy to generate new free electrons, resulting in a sudden rise in current through the semiconductor material.

Step by step solution

01

Understanding Avalanche Breakdown

Avalanche breakdown is a phenomenon that occurs in semiconductors when a strong electric field is applied across it. Under this electric field, the free electrons in the conduction band gain sufficient energy that when they collide with the atoms in the lattice, multiple electrons are knocked out of their orbits, further adding to the free electrons. This process leads to an exponential increase in the number of free electrons, causing a sudden rise in current through the semiconductor material. This phenomenon is known as the avalanche breakdown. Now let's analyze each given option:
02

Option (A): Collision of minority charge carriers

Collision of minority charge carriers can lead to the generation of additional charge carriers, thus contributing to the conduction process. However, this is not the main cause of the avalanche breakdown. Instead, the strong electric field that causes electrons to gain enough energy to generate new free electrons is the key factor.
03

Option (B): Increase in depletion layer thickness

An increase in the depletion layer thickness would lead to an increase in the barrier voltage, which could increase the electric field across the device. However, this is not the primary reason for avalanche breakdown. Avalanche breakdown occurs due to the strong electric field that causes the multiplication of free electrons.
04

Option (C): Decrease in depletion layer thickness

Decreasing the depletion layer thickness would lead to a decrease in the barrier voltage and decrease the electric field across the device, which is opposite to the necessary conditions for avalanche breakdown to occur (strong electric field). So, this choice is not correct.
05

Option (D): None of these

As we have analyzed each of the given options, none of them directly describes the concept of avalanche breakdown. Therefore, the correct answer is (D) None of these.

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