Semiconductor Junction Concepts

The video tutorial explains the formation and characteristics of a PN junction, which occurs when a ptype semiconductor is joined with an ntype semiconductor. It describes the diffusion process of free electrons and holes across the junction, leading to the formation of a potential barrier. This barrier prevents further movement of charge carriers, creating a depletion layer where no free electrons or holes are present.

What is formed when a p-type semiconductor is joined with an n-type semiconductor?

• A diode

• A PN junction

• A potential barrier

• A depletion layer

Which type of ions are present in a p-type semiconductor?

• Neutral atoms

• Negative acceptor ions

• Positive donor ions

• Free electrons

What is the main characteristic of n-type material?

• High concentration of holes

• High concentration of free electrons

• High concentration of acceptor ions

• Low concentration of donor ions

What happens to free electrons at the junction?

• They disappear

• They move to the n-type side

• They move to the p-type side

• They remain stationary

What charge is built on the n-type side of the junction?

• No charge

• Negative charge

• Neutral charge

• Positive charge

What prevents further diffusion of charge carriers?

• The presence of free electrons

• The presence of holes

• The potential barrier

• The depletion layer

What is the potential barrier also known as?

• Electron barrier

• Junction barrier

• Charge barrier

• Depletion layer

What happens to the holes when a sufficient number of donor and acceptor ions are uncovered?

• They continue to move freely

• They are repelled from crossing the junction

• They disappear

• They become electrons

What is the effect of the negative charge on the p-side of the junction?

• It has no effect

• It attracts more electrons

• It neutralizes the charge

• It repels free electrons from entering

What is the region called where no free electrons or holes are available?

• Potential barrier

• Neutral zone

• Depletion layer

• Charge-free zone