Conductivity of pure silicon at 300 K is:

Question

Question

This question was previously asked in

MPMKVVCL Bhopal JE Electrical 24 August 2018 Official Paper

Answer 1

Concept

The conductivity of the silicon is given by:

\(σ=n_ie(μ_e+μ_h)\)

where, σ = Conductivity

e = Charge of electron

μ_e = Mobility of electron

μ_h = Mobility of holes

Calculation

At t = 300 K, μe = 1300 and μh = 500

n_i = \(1.5\times 10^{10}\space cm^{-3}\)

\(σ=1.5\times 10^{10}\space cm^{-3}\times 1.6\times 10^{-19}(1300+500)\)

σ = 4.35 * 10-4 S/m