Virtual Labs

1. What physical quantity does carrier mobility relate to? (Select the full term, not symbol)

a: Carrier lifetime Explanation

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b: Velocity per electric field Explanation

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c: Electric field per velocity Explanation

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d: Carrier concentration Explanation

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2. Which of the following best describes diffusion current?

a: Current due to electric field Explanation

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b: Current due to carrier gradient Explanation

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c: Current due to recombination Explanation

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d: Zero in intrinsic semiconductors Explanation

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3. In which direction do holes drift when an electric field is applied in the positive x-direction?

a: Negative x-direction Explanation

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b: Positive x-direction Explanation

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c: Perpendicular to x-direction Explanation

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d: No net movement Explanation

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4. How does increasing electric field affect drift current density?

a: Increases linearly until saturation Explanation

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b: Constant throughout Explanation

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c: Decreases due to scattering Explanation

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d: No effect on electrons Explanation

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5. A gradient in hole concentration in a p-type semiconductor will produce:

a: No current Explanation

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b: Drift current only Explanation

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c: Diffusion current Explanation

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d: Saturation current Explanation

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6. Which of the following impacts the diffusion coefficient the most?

a: Doping level Explanation

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b: Mobility Explanation

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c: Band gap Explanation

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d: Dielectric constant Explanation

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7. In the presence of both electric field and carrier gradient, total current is:

a: Only drift Explanation

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b: Only diffusion Explanation

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c: Sum of drift and diffusion Explanation

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d: Zero Explanation

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8. A continuity equation is used to express:

a: Band bending Explanation

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b: Carrier generation and recombination Explanation

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c: Lattice vibration Explanation

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d: Electric field variation Explanation

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9. In steady-state conditions, what does the continuity equation simplify to?

a: ∂n/∂t = 0 Explanation

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b: J = 0 Explanation

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c: Electric field is constant Explanation

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d: Mobility is constant Explanation

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Carrier Transport