Mobility of electrons in a semiconductor is defined as the ratio of their drift velocity to the applied electric field. If, for an N -type semiconductor, the density of electrons is 10 19 m - 3 and their mobility is 1.6 m 2 V - 1 s - 1 , then the resistivity of the semiconductor (since it is an N -type semiconductor contribution of holes is ignored) is close to:

Question

Mobility of electrons in a semiconductor is defined as the ratio of their drift velocity to the applied electric field. If, for an N -type semiconductor, the density of electrons is 10 19 m - 3 and their mobility is 1.6 m 2 V - 1 s - 1 , then the resistivity of the semiconductor (since it is an N -type semiconductor contribution of holes is ignored) is close to:, 0.2 Ω m, 4 Ω m, 2 Ω m, 0.4 Ω m

MARKS App · Accepted Answer

Resistivity ρ = E J = E n e υ d = 1 n e μ μ = mobility ρ = 1 10 19 × 1.6 × 10 - 19 × 1.6 = 1 2.56 Ω m = 0.4 Ω m

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