An n-type silicon sample has a resistivity of 5 Ω - cm

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An n-type silicon sample has a resistivity of 5 Ω - cm at T = 300 K. The mobility is µ_a = 1350 cm²/ V - s. The donor impurity concentration is—

1. 2.86 × 10^–14 cm^–3
2. 9.25 × 10¹⁴ cm^–3
3. 11.46 × 10¹⁵ cm^–3
4. 1.1 × 10^–15 cm^–3

Correct Option: B

Given data, ρ = 5 Ω-cm
µ_n = 1350 cm²/ V-s
N_d =?

ρ =		1	=	1
		σ		9µ_nN_d

5 =	1
	1.6 × 10^–19 × 1350 × N_d

or N_d = 9.25 × 10¹⁴ cm^–3