文档介绍：MOSFET AND RELATED DEVICE
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Physics of Semiconductor Devices
OUTLINE
The Power MOSFET
The MOS Diode
MOSFET Fundamentals
MOSFET Scaling
COMS and S
MOSFET on Insulator
MOS Memory Structure
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Physics of Semiconductor Devices
SiO2
metal
semiconductor
SiO2
semiconductor
d
Ohmic contact
The MOS Diode is of paramount important in semiconductor device physics because the device extremely useful in the study of semiconductor surfaces.
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Physics of Semiconductor Devices
The Ideal MOS Diode
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Physics of Semiconductor Devices
An ideal MOS diode is defined as follows:
At zero applied bias,
The only charges that exist in the diode under any biasing conditions are those in the semiconductor and those with equal but opposite sign on the metal surface adjacent to the oxide.
There is no carrier transport through the oxide under the direct current dc)-biasing conditions, or the resistivity of the oxide is infinite.
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Physics of Semiconductor Devices
Operation Modes
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Physics of Semiconductor Devices
Energy Band Diagrams And Charge Distribution
Accumulation :
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Physics of Semiconductor Devices
Accumulation:
Qm
QS
-d
x
Charge Distribution
x
E(X)
Electric Field
An accumulation of holes near the oxide-semiconductor interface.
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Physics of Semiconductor Devices
Depletion:
EF
Vg>0
EF
Ev
Ec
Ei
Charge Distribution
E(X)
x
Electric Field
x
w
Qm
-d
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Physics of Semiconductor Devices
Strong Inversion:
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Physics of Semiconductor Devices