Question

A Silicon crystal with 5 * 10 ^ 15 cm ^ -3 donor additives is given. The crystal is illuminated at t = 0 with a light source of g0 = 5 * 10 ^ 18 (1 / cm ^ 3 s). The average lifetime of the crystalline minority carriers is tau = 10 microsecond and t = t1 = 0.1 * (15) * tau Since the light source is turned off in microseconds;

a) Calculate the time-dependent variation of the extra minority carriers to be formed for 0 <= t <= infinity and draw approximately by specifying important values,
b) Calculate the time-dependent variation of the conductivity for 0 <= t <= infinity and draw approximately by specifying important values.

I need quick answer pls.Thank you

Answer 1