Module 6 : PHYSICS OF SEMICONDUCTOR DEVICES
Lecture 34 : Intrinsic Semiconductors
   
Exercise 1
  For an intrinsic semiconductor the number of electrons in the conduction band is equal to the number of holes in the valence band since a hole is left in the valence band only when an electron makes a transition to the conduction band,
 
$\displaystyle n = p$
  Using this and assuming that the effective masses of the electrons and holes are the same one gets
 
$\displaystyle e^{(E_F-E_c)/kT}= e^{(E_v-E_F)/kT}$
 
 
   
5
8
10
19
21