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64 CHAPTER 4
CONDUCTION BAND (EMPTY)
Eg
----- ------ - - - - -- -----::--- EF
Figure 4.14. Electronic structure of an intrinsic semiconductor.
CONDUCTION BAND
-------------------------------Eg
E -------------------
F -. -. -. -. -. DONOR LEVELS
n-type
anionic vacancies, interstitual atoms
CONDUCTION BAND
-------------------------------Eg
p-type
cationic 'Vacancies, lower valence cations
Figure 4.15. Electronic structure of impurity semiconductors.