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6 Advanced Models for Practical Devices
E VAC
E C
E V
E F
E F
E VAC
EA
ΔE
SBH
(a)
ΔE =
-
insulator
EA
E F
E VAC
E VAC
E C
E V
E F
ΔE
V FB =
-
(b)
Fig. 6.1 Energy level diagram of a ideal Schottky contact and b ideal MOS (see text for explanation)
Fig. 6.2 Schematic of relationships between a metal work function and SBH and b metal work
function and effective work function (see text for explanation)
S ≡
d (SBH )
d φ m
(6.5)
or
S ≡
d (V FB )
d φ m
.
(6.6)