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On doping germanium with donor atoms of ...

On doping germanium with donor atoms of density `10^(17)cm^(-3)`, find its conductivity if mobility of electrons is `3800 cm^(2)//V-s` and intrinsic carrier concentration is `2.5xx10^(13)cm^(-3)`. Also find the ratio of conductivity of doped germanium and pure germanium.

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`sigma=n e mu_(e)=10^(17)xx1.6xx10^(-19)xx3800`
`=60.8 S cm^(-1)`
`sigma_d/sigma_(i)=n_d/n_(i)=(10^(17))/(2.5xx10^(13))=4xx10^(3):1`
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