Keithley 4200A-SCS - Page 159

Section
4: Multi-frequency capacitance-voltage unit Model 4200A-SCS Parameter Analyzer
Reference Manual
4-66 4200A-901-01 Rev. C / February 2017
Formula: WWF
Formula name: WWF (W-WF)
Units: cm
Description: Depletion depth (W-WF computation).
Formulator entry:
WWF = ES*AREA*(1/CP_GB-1/COX)-WF
Simplified equation:
Constants
Constant
Default value
Units
Description
AREA
0.010404
cm
2
Gate area of device
DOPETYPE
1
none
1
= P-type,
-1
= N-type
EBG
1.12
eV
E
BG
- Semiconductor energy gap
EOX 3.4e-13 F / cm
ε
OX
- Permittivity of oxide
ES
1.03e-12
F / cm
ε
S
- Semiconductor permittivity
NI
1.45e+010
cm
-3
N
I
- Intrinsic carrier concentration
TEMP
300
K
Test temperature
WM
4.15
V
W
M
- Metal work function
WS 4.05 V
W
S
- Silicon electron affinity