Semiconductor Physics: Fermi Level and Work Function
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Questions and Answers

What is the energy required to take an electron from the Fermi level to escape to infinity and arrive with zero energy?

  • Conduction band energy
  • Fermi energy
  • Electron affinity
  • Work function (correct)

    • Which type of semiconductor has the Fermi level close to the conduction band?

  • Intrinsic semiconductor
  • p-type semiconductor
  • Insulator
  • n-type semiconductor (correct)

    • What is the energy difference between the conduction band minimum and the vacuum energy level?

  • Valence band energy
  • Fermi energy
  • Electron affinity (correct)
  • Work function

    • What is the purpose of a Schottky diode when used as a rectifier contact?

    <p>To allow current flow in one direction</p> Signup and view all the answers

    What is represented by the symbol Фm?

    <p>Work function of metals</p> Signup and view all the answers

    Which type of semiconductors can form a Schottky contact?

    <p>Both n-type and p-type semiconductors</p> Signup and view all the answers

    What is the result of transferring free electrons from the n-type semiconductor into metal near the contact?

    <p>Energy band bending near the contact</p> Signup and view all the answers

    What happens to the potential barrier ΦB when the metal is forward biased (VA > 0)?

    <p>It decreases</p> Signup and view all the answers

    What is the outcome when the applied voltage is continuously increased in a forward biasing condition?

    <p>Depletion region becomes thinner</p> Signup and view all the answers

    Why is a positive current generated across the MS junction in a forward biasing condition?

    <p>Electrons diffuse from the semiconductor towards the metal</p> Signup and view all the answers

    What is the relationship between the Fermi energy of metal and the Fermi energy in the semiconductor under forward biasing?

    <p>The Fermi energy of metal is lower than the Fermi energy in the semiconductor</p> Signup and view all the answers

    Which of the following is NOT a result of forward biasing in a metal-semiconductor junction?

    <p>Barrier height increases</p> Signup and view all the answers

    What is the Schottky barrier height defined as?

    <p>The energy difference between the band edge with majority carriers and the Fermi energy of the metal</p> Signup and view all the answers

    What occurs when a metal and a semiconductor are brought together under equilibrium conditions?

    <p>Electrons transfer from the semiconductor to the metal</p> Signup and view all the answers

    What is the depletion layer formed at the junction of a metal and n-type semiconductor?

    <p>A potential energy barrier</p> Signup and view all the answers

    What is the relationship between the work function of semiconductors and the electron affinity?

    <p>The work function is related to the electron affinity, conduction band, and Fermi energy</p> Signup and view all the answers

    What is the result of aligning the Fermi energy of the metal and the semiconductor?

    <p>The formation of a Schottky barrier</p> Signup and view all the answers

    What is the energy band diagram like when a metal and n-type semiconductor are brought together?

    <p>The Fermi energy of the metal and semiconductor is mismatched</p> Signup and view all the answers

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