1.

Determine the number of density of donor atoms which have to be added to an intrisic germanium semiconductor to produce an `n`-type semiconductor of conductivity `5mho//cm`. Given that the mobility of electrons in `n`-type semiconductor is `3850cm^(2)//volt-sec`.

Answer» Assuming `N_(D)=n_(e)`
`sigma=n_(e)emu_(e)`
`5xx10^(2)=n_(e)xx1.6xx10^(-19)xx3850xx10^(-4)`
`n_(e)8.1xx10^(21)//m^(3)`


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