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6 Advanced Models for Practical Devices
Ideal SchoƩky
(a)
(b)
Vacuum Metal Work Function
Effective Work Function
(c)
Fig. 6.3 a Examples of metal work function versus SBH for interfaces between GaAs{110} or
GaAs{100} and various metals [2]. b Examples of metal work function versus effective work
function for interfaces between SiO 2 or ZrO 2 and various metals [3]. c Examples of metal work
function versus effective work function for MOS with metal–HfO 2 –Si structure, where the slope
of the red broken line is nearly 1, indicating that the system is almost under the ideal condition [4]
E VAC
E C
E V
E F
E F
E VAC
EA
SBH
Δ
Fig. 6.4 Schematic energy diagram for nonideal Schottky contact (see text for explanation)