Intrinsic Semiconductors and Electron-Hole Densities
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Questions and Answers

What is the relationship between electron density (n) and hole density (p) in an intrinsic semiconductor?

  • n < p
  • n = 0, p = ni
  • n = p = ni (correct)
  • n > p

    • Where is the Fermi level (EFi) located in an intrinsic semiconductor?

  • Near the middle of the forbidden band (correct)
  • At the valence band edge
  • Outside the energy gap
  • At the conduction band edge

    • What happens to the Fermi level (EFi) if kT is significantly lower than the energy gap?

  • Shifts close to the conduction band edge
  • Becomes undefined
  • Remains near the middle of the forbidden band (correct)
  • Shifts close to the valence band edge

    • What type of semiconductor has a lower electron density but a higher hole density compared to an intrinsic semiconductor?

    <p>P-type semiconductor</p> Signup and view all the answers

    What are impurities called that lack one or several electrons to realize a full bonding with the rest of the crystal in a semiconductor?

    <p>Acceptors</p> Signup and view all the answers

    What type of impurity is intentionally added to a P-type semiconductor like silicon?

    <p>Acceptor</p> Signup and view all the answers

    What is an intrinsic semiconductor?

    <p>A semiconductor with evenly distributed electrons and holes</p> Signup and view all the answers

    What role does doping play in semiconductor behavior?

    <p>Introduces impurities to modify carrier concentrations</p> Signup and view all the answers

    What is the role of the energy density of states N(E) in semiconductors?

    <p>Represents the number of states per unit volume and energy range</p> Signup and view all the answers

    For a direct gap semiconductor, what is the effective mass of an electron in the crystal?

    <p>The effective mass of an electron</p> Signup and view all the answers

    What does Nc(E) represent in semiconductors?

    <p>Number of states in the conduction band per unit volume and energy</p> Signup and view all the answers

    Intrinsic semiconductors differ from doped semiconductors mainly by:

    <p>Having vacancies created by thermally excited electrons</p> Signup and view all the answers

    What is the most well-known material in semiconductor research?

    <p>Silicon</p> Signup and view all the answers

    Which type of semiconductor consists of two different elements?

    <p>Extrinsic semiconductor</p> Signup and view all the answers

    What type of device was germanium frequently used in before silicon took over?

    <p>Rectifiers</p> Signup and view all the answers

    Which material was not suitable for applications requiring weak current consumption and high temperature operation?

    <p>Germanium</p> Signup and view all the answers

    What type of semiconductors have electrical or optical properties that are not achievable with pure semiconductors?

    <p>Extrinsic semiconductors</p> Signup and view all the answers

    When did silicon start to overcome all other semiconductors?

    <p>1960</p> Signup and view all the answers

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