The diffusion length for electrons Ln 316 mu in an ndoped N

The diffusion length for electrons L_n = 3.16| mu in an n-doped (N_d = 10^17 cm^-3) semiconductor is known at a temperature T = 300K. The recombination lifetimes are also tau_p = tau_n = 1.0 ns. Find the conductivity of the semiconductor.

Solution

conductivity = Ln * Nd/T

= 1.05 * 1000

= 1050 m-ohm^-1

conduction time = 1.2 sec