Module 6 : PHYSICS OF SEMICONDUCTOR DEVICES
Lecture 35 : Diffusion
 
which gives
$\displaystyle E(x) = \frac{kT}{q}\frac{1}{N_a}\frac{dN_a}{dx}$
  Substituting the above in (A) and cancelling common terms, we get
 
$\displaystyle \frac{D_p}{\mu_h} = \frac{kT}{q}$
  A similar relation can be established for electrons. The relations
 
$\displaystyle \boxed{ \frac{D_p}{\mu_h} = \frac{D_n}{\mu_e}= \frac{kT}{q}}$
  Are known as bf Einstein relations between mobility and diffusion constant.
  Example 12
  Exercise 1
  Exercise 2
   
5
8