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Questions and Answers

What is the primary reason that continuous atomic-level contact is not possible in any crystal, no matter how smooth?

The crystal structure is not perfectly uniform, leading to variations in the inter-atomic spacing.

The impurities present in the crystal lattice disrupt the continuity of the atomic-level contact.

The inter-atomic spacing is much larger than the atomic diameter, making the surface inherently rough at the atomic scale. (correct)

The thermal vibrations of the atoms prevent them from maintaining continuous contact.

How does the applied voltage affect the height of the potential barrier in a p-n junction diode under forward bias?

The applied voltage has no effect on the height of the potential barrier, which remains constant.

The applied voltage can either increase or decrease the height of the potential barrier, depending on the magnitude of the voltage.

The applied voltage decreases the height of the potential barrier, making it easier for charge carriers to cross the junction. (correct)

The applied voltage increases the height of the potential barrier, making it more difficult for charge carriers to cross the junction.

What is the primary mechanism for the flow of electric current in a p-n junction diode under forward bias?

The diffusion of majority charge carriers across the junction.

The drift of majority charge carriers across the junction.

The tunneling of charge carriers through the potential barrier.

The injection of minority charge carriers across the junction. (correct)

What is the relationship between the applied voltage and the width of the depletion region in a p-n junction diode under reverse bias?

The applied voltage increases the width of the depletion region. Signup and view all the answers

What is the primary purpose of the metallic contacts attached to the ends of a semiconductor diode?

To provide a means of applying an external voltage to the diode. Signup and view all the answers

What is the primary function of the depletion region in a p-n junction?

To create a barrier potential that impedes the flow of charge carriers Signup and view all the answers

Under what condition does a p-n junction allow the flow of significant current?

When it is forward-biased with a small voltage Signup and view all the answers

Which factor primarily determines the barrier potential in a p-n junction formed by different semiconductor materials?

The type of semiconductor material used (e.g., Si, Ge, C) Signup and view all the answers

What is the primary mechanism responsible for the movement of charge carriers in a p-n junction under equilibrium conditions?

Diffusion due to concentration gradients Signup and view all the answers

In a p-n junction, what happens to the barrier potential when a reverse bias is applied?

The barrier potential increases, impeding the flow of current Signup and view all the answers