(Solved): Question about semiconductors For a pure silicon semiconductor (T = 300 K), its excess carriers ...

Question about semiconductors

For a pure silicon semiconductor (T = 300 K), its excess carriers are being uniformly generated by light with a rate of g = 1×10²¹cm^-3s^-1. Lifetimes of the electrons and holes are equal (?_n = ?_p = 10^-7 s), and their diffusion lengths are L_n = 25 ?m and L_p = 10 ?m, respectively.

1. Calculate he steady state total conductivity of the semiconductor under illumination (light is on).

2. Calculate the conductivity of the semiconductor at t = 2 ?s after the light is turned off.