Question: A Si sample with 1 0 1 6 1 0 ^ { 1 6 } 1 0 1 6 / cm ^ 3 donors is

A Si sample with 101610^{16}1016/cm^3 donors is optically excited such that 101910^{19}1019/cm^3 EHPs are generated per second uniformly in the sample. The laser causes the sample to heat up to 450 K. Find the quasi-Fermi levels and the change in conductivity of the sample upon shining the light. Electron and hole lifetimes are both 10s.
Dp=12D_p =12Dp=12 cm^2/s; Dn=36D_n =36Dn=36 cm^2/s; ni=1014n_i =10^{14}ni=1014 cm^3 at 450 K. What is the change in conductivity upon shining light?

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