Semiconductor Current Density and p-n Junctions
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Questions and Answers

What is the term used to describe the total current density due to drift and diffusion of electrons?

  • Jh = e(pμhE - Dh)
  • Je = e(nμeE + De) (correct)
  • Je(drift) + Je(diff)
  • Je = e(pμeE + De)

    • What happens when N-type and P-type semiconductor materials are joined together?

  • They lose their charge carriers
  • They become electrically neutral
  • They create a potential barrier zone (correct)
  • They form a Depletion Layer

    • What is the name of the zone around the PN Junction that is depleted of free carriers?

  • Diffusion layer
  • Depletion region (correct)
  • Drift layer
  • Potential barrier zone

    • What happens to the free charge carriers when a potential barrier is created around the PN Junction?

    <p>They are repelled from the junction (C)</p> Signup and view all the answers

    What do donor atoms do in a PN Junction?

    <p>Attract electrons (A)</p> Signup and view all the answers

    How do N-type and P-type semiconductor materials behave when fused together?

    <p>They produce a Depletion Layer (B)</p> Signup and view all the answers

    What happens to the electric field in a P-N junction under forward biasing?

    <p>An electric field is produced from P to N (D)</p> Signup and view all the answers

    How does the barrier energy change in a P-N junction under forward biasing?

    <p>The barrier energy decreases (A)</p> Signup and view all the answers

    What effect does forward bias have on the flow of majority charge carriers in a P-N junction?

    <p>The flow of majority charge carriers increases (B)</p> Signup and view all the answers

    Which statement best describes the effect of forward bias on minority charge carriers in a P-N junction?

    <p>Forward bias has no effect on minority charge carriers (C)</p> Signup and view all the answers

    What happens to the current in a P-N junction under forward bias?

    <p>A strong current flows (C)</p> Signup and view all the answers

    How does the width of the depletion layer change under forward biasing in a P-N junction?

    <p>The width of the depletion layer decreases (A)</p> Signup and view all the answers

    In a PN junction under reverse bias, what happens to the number of majority charge carriers crossing the junction?

    <p>Becomes nearly zero (D)</p> Signup and view all the answers

    What effect does an increase in temperature have on the reverse saturated current in a PN junction?

    <p>Increases the current (A)</p> Signup and view all the answers

    What is the energy band structure of a PN junction under forward biasing?

    <p>Barrier energy increases, depletion layer decreases (B)</p> Signup and view all the answers

    What is the impact on current when a PN junction is under forward bias?

    <p>Majority charge carriers dominate the current flow (C)</p> Signup and view all the answers

    What type of junction is an extension of metal-semiconductor point contact diode?

    <p>Schottky diode (C)</p> Signup and view all the answers

    What is another name for a hot electron diode?

    <p>Schottky diode (C)</p> Signup and view all the answers

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