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The temperature dependence of the saturation velocities of electrons and holes in basic materials is calculated by

(3.134) 
The following model parameters from [182] are used.
Table 3.31:
Parameter values for velocity saturation model
Material 
[m/s] 

[m/s] 

Si 
1.0e5 
0.26 
0.704e5 
0.63 
Ge 
0.7e5 
0.55 
0.63e5 
0.61 
GaAs 
0.72e5 
0.56 
0.9e5 
0.41 
AlAs 
0.85e5 
0.55 
0.8e5 
0.3 
InAs 
0.9e5 
0.57 
0.5e5 
0.3 
InP 
0.67e5 
0.68 
0.5e5 
0.3 
GaP 
0.88e5 
0.30 
0.5e5 
0.3 

In the case of alloy materials the temperature dependent saturation velocities are
calculated first using (3.134). For an alloy
the model suggests a quadratic interpolation between the
saturation velocities for electrons of the basic materials (A and B) depending on the
material composition . In case of holes a linear interpolation is assumed.

(3.135) 
The bowing parameters and are summarized in the following table.
Table 3.32:
Parameter values for velocity saturation model for alloy materials
Material 
[m/s] 
[m/s] 
SiGe 
2.28e5 
0.0 
AlGaAs 
0.0512e5 
0.0 
InGaAs 
0.196e5 
0.0 
InAlAs 
2.13e5 
0.0 
InAsP 
0.0 
0.0 
GaAsP 
0.0 
0.0 
InGaP 
0.3e5 
0.0 

Next: 3.6 Energy Relaxation Time
Up: 3. Physical Models
Previous: 3.4.5 HighField Mobility for
Vassil Palankovski
20010228