PDF Notes: Chapter1EF+TD

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    What defines a semiconductor?

    Intermediate resistivity between conductors and insulators.

    How do semiconductors behave at low temperatures?

    They act like insulators due to low thermal agitation.

    What happens to the resistivity of a semiconductor as temperature increases?

    It decreases, allowing more current to flow.

    What distinguishes intrinsic from extrinsic semiconductors?

    Intrinsic are pure, while extrinsic are doped with impurities.

    What is the role of doping in semiconductors?

    It introduces charge carriers to enhance conductivity.

    What are the majority carriers in N-type semiconductors?

    Electrons are the majority carriers.

    What defines a P-type semiconductor?

    It has holes as majority carriers due to trivalent doping.

    What is the significance of the band gap in semiconductors?

    It determines the energy required to generate charge carriers.

    What occurs during thermal ionization in semiconductors?

    Valence electrons are freed, creating holes and free electrons.

    What is recombination in semiconductors?

    A free electron fills a hole, restoring a covalent bond.

    What happens when a PN junction is formed?

    It allows current to flow in only one direction.

    What is the depletion region in a PN junction?

    A region with a shortage of charge carriers.

    How does increasing doping affect the depletion layer width?

    It decreases the width of the depletion layer.

    What is the effect of temperature on electron-hole pair generation?

    Higher temperatures increase the generation rate.

    What is the relationship between conductivity and electric field in semiconductors?

    Conductivity is proportional to the applied electric field.

    What defines the intrinsic carrier concentration at equilibrium?

    It is equal for electrons and holes in pure semiconductors.

    What happens to a semiconductor's resistance when heated?

    Resistance decreases as more charge carriers are generated.