Semiconductor Quiz part 2

What type of impurity atoms are added to increase the conductivity of intrinsic semiconductor?

• Bismuth, Antimony

• Indium, Arsenic

• Arsenic, Phosphorus

• Boron, Gallium

In an extrinsic-n semiconductor, where is the Fermi level located in the band diagram?

• In the Forbidden Band

• Close to Conduction Band

• At the center of the Band Gap

• Close to Valence Band

What is the majority carrier in an extrinsic-p semiconductor?

• Electrons

• Holes

• Positive Ions

• Negative Ions

What is the charge concentration equation for an extrinsic semiconductor?

• np = n / N_A

• np = n

• np = n^2

• np = n^2 / N_D

What is the purpose of doping in a semiconductor?

• To increase the conductivity

• To decrease the conductivity

• To lower the Fermi level

• To reduce the carrier concentration

What is the role of acceptor impurity atoms in a p-type semiconductor?

• Donate Electrons

• Increase Band Gap

• Accept Electrons

• Create Holes

What is the relationship between electron and hole densities in an extrinsic semiconductor?

• n < p

• n = 0

• n > p

• n = p

What is the charge of the fixed ions in an n-type semiconductor?

• Positive

• Negative

• Neutral

• Variable

What happens to the band gap energy in a p-type semiconductor?

• It decreases

• It becomes zero

• It increases

• It remains the same

What is the intrinsic carrier concentration of silicon?

• 10^13 cm^-3

• 2x10^12 cm^-3

• 10^12 cm^-3

• 2x10^13 cm^-3