Semiconductors: Properties and Behavior
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Questions and Answers

Who discovered that electrical resistivity decreases as temperature increases in silver sulfide?

  • Nikola Tesla
  • Michael Faraday (correct)
  • Thomas Edison
  • Albert Einstein
  • In which material does the resistance decrease as temperature increases?

  • Copper
  • Gold
  • Silver Sulfide (correct)
  • Germanium
  • What is the band called in which most electrons remain bound to the atoms?

  • Conduction Band
  • Valence Band (correct)
  • Energy Gap Band
  • Resistance Band
  • What is the name of the highest occupied energy band where most electrons remain bound to the atoms?

    <p>Valence Band</p> Signup and view all the answers

    Where do the electrons from the valence band go when they enter the conduction band?

    <p>Conduction Band</p> Signup and view all the answers

    What type of impurity is added in P-type doping?

    <p>Boron or gallium</p> Signup and view all the answers

    What is the name of the band that accepts the electrons from the valence band?

    <p>Conduction Band</p> Signup and view all the answers

    What is the effect of adding boron or gallium in P-type doping?

    <p>Generates a positive charge in the lattice</p> Signup and view all the answers

    What happens when an electron in the lattice is knocked loose from its position in intrinsic Silicon?

    <p>It leaves behind a hole and can contribute to a small current flow</p> Signup and view all the answers

    What happens when phosphorus or arsenic is added to silicon in N-type doping?

    <p>Forms extra electrons in the silicon lattice</p> Signup and view all the answers

    What do we create by joining two pieces of semiconductor, one doped n-type and the other p-type?

    <p>A diode</p> Signup and view all the answers

    What is created around the p-n junction when a depletion zone forms?

    <p>A space charge</p> Signup and view all the answers

    What happens when a p-n junction is formed?

    <p>Extra electrons from the n-region freely diffuse across the junction and combine with holes</p> Signup and view all the answers

    What type of conductivity does N-type silicon exhibit?

    <p>'Electron' conductivity</p> Signup and view all the answers

    What type of conductivity does P-type silicon exhibit?

    <p>'Hole' conductivity</p> Signup and view all the answers

    What happens when an electron enters the Conduction Band?

    <p>It becomes a free electron and can contribute to a small current flow</p> Signup and view all the answers

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