Question

Mobilities of electorns and holes in a sample of intrinsic germanium at room temperature are `0.54m^(2)V^(-1)s^(-1)` and `0.18m^(2)V^(-1)s^(-1)` respectively.
If the electron and hole densities are equal to `3.6xx10^(19)m^(-3)` calculate the germanium conductivity.
A. `4.14 S m^(-1)`
B. `2.12 S m^(-1)`
C. `1.13 S m^(-1)`
D. `5.6 S m^(-1)`

Answer 1

Correct Answer - A
As `sigma=e(n_emu_e+n_(ni)mu_n)`
`=en_i(mu_e+mu_n)`
`=1.6xx10^(-19)xx3.6xx10^19(0.54+0.18)=4.147 S m^(-1)`