ECEN 370 Exam 2 Semiconductor
terms questions well answered
What are acceptor atoms? - correct answer ✔✔ Atoms that can accept an electron to become
positively charged. Creates holes and is added to a semiconductor to make it p-type
What is a compensated semiconductor? - correct answer ✔✔ A semiconductor with equal
amounts of donor and acceptor impurities. Typically these dopants are added in equal measure
to reduce its conductivity and keep it nearly intrinsic like.
What is the conduction band? - correct answer ✔✔ The energy band in a solid where electrons
can move freely. Electrons in this band can participate in electrical conduction.
What is a degenerate semiconductor? - correct answer ✔✔ A semiconductor with a high
concentration of charge carriers, either donor or acceptor electrons. Can occur in very low
temps or with a high number of dopants.
What is diffusion? - correct answer ✔✔ The movement of charge carriers (holes and electrons)
from an area of high concentration to low concentration.
What are donor atoms? - correct answer ✔✔ Atoms that can donate an electron to become
negatively charged. Has extra electrons so donates them. Added to make a semiconductor n-
type.
What is the effective density of states at the conduction band edge? - correct answer ✔✔ The
number of available energy states for electrons in the conduction band.
terms questions well answered
What are acceptor atoms? - correct answer ✔✔ Atoms that can accept an electron to become
positively charged. Creates holes and is added to a semiconductor to make it p-type
What is a compensated semiconductor? - correct answer ✔✔ A semiconductor with equal
amounts of donor and acceptor impurities. Typically these dopants are added in equal measure
to reduce its conductivity and keep it nearly intrinsic like.
What is the conduction band? - correct answer ✔✔ The energy band in a solid where electrons
can move freely. Electrons in this band can participate in electrical conduction.
What is a degenerate semiconductor? - correct answer ✔✔ A semiconductor with a high
concentration of charge carriers, either donor or acceptor electrons. Can occur in very low
temps or with a high number of dopants.
What is diffusion? - correct answer ✔✔ The movement of charge carriers (holes and electrons)
from an area of high concentration to low concentration.
What are donor atoms? - correct answer ✔✔ Atoms that can donate an electron to become
negatively charged. Has extra electrons so donates them. Added to make a semiconductor n-
type.
What is the effective density of states at the conduction band edge? - correct answer ✔✔ The
number of available energy states for electrons in the conduction band.
