Band structure is essentially rigid
Conventional Semiconductors at the atomic level
+
n-type doping
Egap
e-
Si
Si
Si
Si
P+
5 valence electrons
Phosphorous has
VB
CB
0
Edonor
+
At room temperature electron is delocalized in conduction band (CB)
p-type
doping
VB
CB
0
E acceptor
Si
Si
Al
Si
Si
Si
Si
Al
Si
Si
-
hole in valence band
``Ionization''
(hole in valence band)
An unbonded electron
+
+
CB
VB
Edonor
ef
CB
VB
Eacceptor
ef
At room temperature hole is delocalized in valence band (VB)
  Mobility is everything