Semiconductor Devices and Electricity
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Questions and Answers

What is the defining characteristic of a semiconductor material?

  • High conductivity
  • Low conductivity (correct)
  • High resistance
  • High insulating ability
  • What is the primary factor determining the magnitude of current in a circuit?

  • Temperature of the circuit
  • Voltage applied to the circuit (correct)
  • Resistance in the circuit
  • Type of semiconductor material used
  • What is the role of doping in semiconductor devices?

  • Increase the resistance
  • Decrease the resistance
  • Increase the conductivity (correct)
  • Decrease the conductivity
  • What is the primary reason for using semiconductor devices in electronic circuits?

    <p>High efficiency</p> Signup and view all the answers

    What determines the electrical properties of a material?

    <p>The energy gap between valence and conduction bands</p> Signup and view all the answers

    What is the energy gap between the valence and conduction bands called?

    <p>Forbidden band</p> Signup and view all the answers

    How do insulators differ from conductors and semiconductors in terms of the energy gap?

    <p>Insulators have a large energy gap</p> Signup and view all the answers

    What happens when thermal energy causes an electron to jump from the valence band to the conduction band?

    <p>It produces a hole - electron pair</p> Signup and view all the answers

    How can semiconductors be made better conductors?

    <p>By adding impurities to contribute extra electrons or extra holes</p> Signup and view all the answers

    How does the distance between atoms affect the behavior of electrons in semiconductors?

    <p>The distance causes the electrons to spread out into bands</p> Signup and view all the answers

    What kind of crystal structure do semiconductors have?

    <p>Regular crystalline structure in monocrystals only</p> Signup and view all the answers

    How are electrons assigned to shells and subshells?

    <p>From inside out</p> Signup and view all the answers

    What determines whether thermal energy is enough to cause an electron to jump from the valence band to the conduction band?

    <p>The size of the energy gap</p> Signup and view all the answers

    What is responsible for producing n type silicon when introduced into the silicon lattice?

    <p>Phosphorus and arsenic as donor dopants</p> Signup and view all the answers

    What happens when elements with 3 outer electrons are added as dopants to silicon?

    <p>They accept an electron from silicon</p> Signup and view all the answers

    What is the defining characteristic of a semiconductor material?

    <p>Neither a good conductor nor a good insulator</p> Signup and view all the answers

    What is responsible for producing n type silicon when introduced into the silicon lattice?

    <p>Doping with acceptor impurities</p> Signup and view all the answers

    How do insulators differ from conductors and semiconductors in terms of the energy gap?

    <p>Insulators have a larger energy gap than semiconductors</p> Signup and view all the answers

    What determines whether thermal energy is enough to cause an electron to jump from the valence band to the conduction band?

    <p>The size of the energy gap</p> Signup and view all the answers

    In which subshell can a maximum of 10 electrons be accommodated?

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

    What determines the electrical properties of a semiconductor material?

    <p>Energy gap between bands</p> Signup and view all the answers

    What are the elements that accept an electron from the silicon lattice known as?

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

    What is responsible for producing n type silicon when introduced into the silicon lattice?

    <p>Donor dopants</p> Signup and view all the answers

    Which type of material has a moderate energy gap, allowing only a few electrons to jump to the conduction band?

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

    What do insulators have that prevents electrons from jumping to the conduction band?

    <p>Large energy gap</p> Signup and view all the answers

    What happens when thermal energy causes an electron to jump from the valence band to the conduction band?

    <p>Creation of electron-hole pairs</p> Signup and view all the answers

    What is the primary purpose of adding impurities (dopants) to semiconductors?

    <p>To contribute extra electrons or holes</p> Signup and view all the answers

    What causes a semiconductor's subshells to spread out into bands as the distance between atoms decreases?

    <p>Overlapping of bands</p> Signup and view all the answers

    What is the defining characteristic of a conductor in terms of its energy gap?

    <p>Nonexistent energy gap</p> Signup and view all the answers

    How many possible electrons can be found in the upper band of semiconductors?

    <p>8</p> Signup and view all the answers

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