Virtual Labs

1. What determines whether a Metal-Semiconductor junction is Ohmic or Schottky in nature?

a: The resistivity of the semiconductor Explanation

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b: The dielectric constant of the metal Explanation

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c: The difference between metal work function and semiconductor electron affinity Explanation

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d: The bandgap of the semiconductor Explanation

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2. What is the built-in potential of a Metal-Semiconductor junction primarily dependent on?

a: Applied bias Explanation

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b: Temperature only Explanation

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c: Difference in work function between metal and semiconductor Explanation

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d: Bandgap of the metal Explanation

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3. What happens when a metal comes in contact with an n-type semiconductor?

a: Electrons flow from semiconductor to metal until equilibrium Explanation

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b: Holes flow from metal to semiconductor Explanation

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c: No movement of carriers Explanation

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d: Only holes flow into the junction Explanation

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4. What is the electric field direction in an unbiased Metal-Semiconductor junction formed with an n-type semiconductor?

a: From metal to semiconductor Explanation

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b: From semiconductor to metal Explanation

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c: There is no electric field Explanation

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d: Parallel to the surface Explanation

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5. In a Schottky junction under forward bias, what happens to the barrier height for electrons?

a: It increases Explanation

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b: It stays the same Explanation

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c: It decreases Explanation

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d: It becomes zero Explanation

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6. Which of the following influences the width of the depletion region in an MS junction?

a: Only the applied voltage Explanation

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b: Doping concentration and built-in potential Explanation

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c: Only the metal used Explanation

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d: Thermal conductivity Explanation

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7. What happens to charge density across the junction under reverse bias?

a: It becomes uniform Explanation

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b: It decreases across the depletion region Explanation

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c: It increases within the depletion region Explanation

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d: It becomes negative everywhere Explanation

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8. In a Metal-Semiconductor junction, what primarily determines the energy band bending at equilibrium?

a: Doping concentration Explanation

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b: Carrier lifetime Explanation

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c: Work function difference between metal and semiconductor Explanation

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d: Mobility of electrons Explanation

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9. Which condition ensures maximum current through a Schottky diode?

a: Reverse bias and low temperature Explanation

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b: Forward bias and low barrier height Explanation

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c: Reverse bias and high barrier Explanation

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d: Forward bias and large depletion width Explanation

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Metal-Semiconductor Junctions