18 Questions
What is the energy required to take an electron from the Fermi level to escape to infinity and arrive with zero energy?
Work function
Which type of semiconductor has the Fermi level close to the conduction band?
n-type semiconductor
What is the energy difference between the conduction band minimum and the vacuum energy level?
Electron affinity
What is the purpose of a Schottky diode when used as a rectifier contact?
To allow current flow in one direction
What is represented by the symbol Фm?
Work function of metals
Which type of semiconductors can form a Schottky contact?
Both n-type and p-type semiconductors
What is the result of transferring free electrons from the n-type semiconductor into metal near the contact?
Energy band bending near the contact
What happens to the potential barrier ΦB when the metal is forward biased (VA > 0)?
It decreases
What is the outcome when the applied voltage is continuously increased in a forward biasing condition?
Depletion region becomes thinner
Why is a positive current generated across the MS junction in a forward biasing condition?
Electrons diffuse from the semiconductor towards the metal
What is the relationship between the Fermi energy of metal and the Fermi energy in the semiconductor under forward biasing?
The Fermi energy of metal is lower than the Fermi energy in the semiconductor
Which of the following is NOT a result of forward biasing in a metal-semiconductor junction?
Barrier height increases
What is the Schottky barrier height defined as?
The energy difference between the band edge with majority carriers and the Fermi energy of the metal
What occurs when a metal and a semiconductor are brought together under equilibrium conditions?
Electrons transfer from the semiconductor to the metal
What is the depletion layer formed at the junction of a metal and n-type semiconductor?
A potential energy barrier
What is the relationship between the work function of semiconductors and the electron affinity?
The work function is related to the electron affinity, conduction band, and Fermi energy
What is the result of aligning the Fermi energy of the metal and the semiconductor?
The formation of a Schottky barrier
What is the energy band diagram like when a metal and n-type semiconductor are brought together?
The Fermi energy of the metal and semiconductor is mismatched
Understand the concept of Fermi level, its position in different types of materials, and how it changes with temperature and electron addition. Learn about the work function and its relation to energy required to take an electron from the Fermi energy level. Test your knowledge of semiconductor physics!
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