Diodes I: Fundamentals of Electronics
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Questions and Answers

What is the p region of a diode called?

  • Conduction band
  • Anode (correct)
  • Depletion region
  • Cathode
  • Which impurities are present in the p-type material of a diode?

  • Trivalent (correct)
  • Tetravalent
  • Pentavalent
  • Hexavalent
  • Where do the free electrons from the n region diffuse in a diode?

  • Conduction band of n region (correct)
  • Valence band
  • P region
  • Depletion region
  • What is the junction between the p and n regions of a diode called?

    <p>P-N junction</p> Signup and view all the answers

    What are the energy levels of the valence and conduction bands in an n-type material compared to a p-type material?

    <p>Lower in n-type material</p> Signup and view all the answers

    What does the depletion region in a diode separate?

    <p>P and n regions</p> Signup and view all the answers

    What happens to the energy level of the n-region conduction band during the formation of the depletion region?

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

    What is the condition for forward bias to allow current through the pn junction?

    <p>Negative side of VBIAS connected to p region, positive side connected to n region</p> Signup and view all the answers

    What effect does forward bias have on the depletion region?

    <p>It causes the depletion region to narrow</p> Signup and view all the answers

    What happens to the valence band energy level when the energy level of the n-region conduction band shifts downward?

    <p>It also shifts downward</p> Signup and view all the answers

    What do valence electrons in the p region do when subjected to forward bias?

    <p>Move towards the left end of the p region</p> Signup and view all the answers

    What are the majority carriers in the p region during forward bias?

    <p>Holes (p-region)</p> Signup and view all the answers

    What is the second requirement for allowing current through the pn junction under forward bias?

    <p>$VBIAS$ must be greater than the barrier potential</p> Signup and view all the answers

    What happens to the number of positive and negative ions during forward bias?

    <p>The number of positive ions is reduced and the number of negative ions is reduced</p> Signup and view all the answers

    What does forward bias allow through the pn junction?

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

    What acts as an 'energy hill' that an n-region electron must climb in order to get to the p-region during equilibrium at the pn junction?

    <p>The electric field between positive and negative ions</p> Signup and view all the answers

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