Mobility of electron and hole in a sample of Ge at room temperature are 0.36 m2 /V-sec and 0.17m2 /V-sec respectively. If electron and holes densities are equal and it is 2.5 ×1013 /cm3 - Applied Physics 1

Numerical

Mobility of electron and hole in a sample of Ge at room temperature are 0.36 m²/V-sec and 0.17m²/V-sec respectively. If electron and holes densities are equal and it is 2.5 ×10¹³/cm³, calculate its conductivity.

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Solution

Data :- μ_e = 0.36 m²/V-sec μ_h = 0.17m²/V-sec T =300°K

`n_i = 2.5×10^13/(cm^3 ) = 2.5×10^19m^3`

Formula :- σ = n(μ_e- μ_h). e
Calculations :- σ = 2.5×10¹⁹(0.36 + 0.17)×1.6×10^-19

= 2.12 mho/metre
Answer :- σ = conductivity = 2.12 mho/metre.

Concept: Conductivity, mobility, current density (drift & diffusion) in semiconductors(n type and p type)

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2017-2018 (June) CBCGS

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Mobility of electron and hole in a sample of Ge at room temperature are 0.36 m2 /V-sec and 0.17m2 /V-sec respectively. If electron and holes densities are equal and it is 2.5 ×1013 /cm3 - Applied Physics 1

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