Virtual Labs

What is meant by carrier concentration in a semiconductor?

a: Number of atoms in the material Explanation

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b: Number of free charge carriers per unit volume Explanation

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c: Total number of electrons Explanation

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d: Density of the crystal Explanation

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In an intrinsic semiconductor at equilibrium, which relation holds true?

a: n₀ > p₀ Explanation

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b: p₀ > n₀ Explanation

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c: n₀ = p₀ Explanation

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d: n₀p₀ = 0 Explanation

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What happens to intrinsic carrier concentration as temperature increases?

a: Decreases exponentially Explanation

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b: Increases linearly Explanation

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c: Remains constant Explanation

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d: Increases exponentially Explanation

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In an n-type semiconductor, what mainly contributes to the electron concentration?

a: Valence band electrons Explanation

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b: Ionized donor atoms Explanation

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c: Holes Explanation

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d: Lattice vibrations Explanation

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Which equation gives the equilibrium electron concentration?

a: n₀ = N_C exp((E_C - E_F)/kT) Explanation

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b: n₀ = N_C exp((E_F - E_C)/kT) Explanation

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c: n₀ = N_V exp((E_V - E_F)/kT) Explanation

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d: n₀ = E_F × N_C Explanation

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What does the mass action law state about n₀ and p₀?

a: n₀p₀ = 0 Explanation

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b: n₀ = p₀ Explanation

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c: n₀p₀ = n_i² Explanation

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d: n₀p₀ = n_i Explanation

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In a degenerate n-type semiconductor, which assumption breaks down?

a: E_F is above E_C Explanation

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b: Boltzmann approximation is valid Explanation

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c: n₀ ≈ N_D Explanation

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d: All donors are ionized Explanation

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What behavior is observed in carrier concentration vs temperature in n-type semiconductors?

a: Constant rise with temperature Explanation

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b: Initial rise, then saturation Explanation

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c: Parabolic increase Explanation

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d: Flat then exponential fall Explanation

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At very high temperature, a doped semiconductor behaves like:

a: An insulator Explanation

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b: An intrinsic semiconductor Explanation

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c: A metal Explanation

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d: A rectifier Explanation

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Carrier Density