Question

Calculate the diffusion constant for the electrons when the mobility of the electrons is 325cm^2/V-s and temperature is 300K?

(a) 0.85 m^2/s

(b) 0.084 m^2/s

(c) 0.58 m^2/s

(d) 0.95 m^2/s

I got this question during an interview.

The doubt is from Diffusion topic in portion Conduction in Semiconductors of Electronic Devices & Circuits

Answer 1

Right choice is (c) 0.58 m^2/s

The explanation is: Dn=VT*μn

= (1.38*10^-23*300*325*10^-2)/ (1.6*10^-19)

= 0.084 m^2/s.