7 pn junction minority carrier distributionsucberkeleyext.com/documents/ic/x481.1/7_pn...
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Dr. Vincent Chang (張文清)
Lecture PN Junction: Minority Carrier Distributions
Vincent Chang
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Vincent Chang
Zero Bias
• Thermal equilibrium
Forward Bias
• Physical meaning
• Distribution
Reverse Bias
• Distribution• Saturation current
Dr. Vincent Chang (張文清)
Outline
Dr. Vincent Chang (張文清)
Minority Carrier Distribution—Zero Bias
Dr. Vincent Chang (張文清)
Minority Carrier Distribution—Zero Bias
Dr. Vincent Chang (張文清)
Minority Carrier Distribution—Zero Bias
Dr. Vincent Chang (張文清)
Minority Carrier Distribution—Zero Bias
Dr. Vincent Chang (張文清)
Minority Carrier Distribution—Zero Bias
Vincent Chang
Zero Bias
• Thermal equilibrium
Forward Bias
• Physical meaning
• Distribution
Reverse Bias
• Distribution• Saturation current
Dr. Vincent Chang (張文清)
Outline
Dr. Vincent Chang (張文清)
Minority Carrier Distribution—Forward
Dr. Vincent Chang (張文清)
Independence Hall, Philadelphia
Dr. Vincent Chang (張文清)
Zero Bias
Dr. Vincent Chang (張文清)
Forward Bias
Dr. Vincent Chang (張文清)
Minority Carrier Injection
Injection
Dr. Vincent Chang (張文清)
Minority Carrier Diffusion
Diffusion
Dr. Vincent Chang (張文清)
Minority Carrier Diffusion
Highconcentration
Lowconcentration
Dr. Vincent Chang (張文清)
Carrier Generation
Covalent bond
Valence electron
Dr. Vincent Chang (張文清)
Carrier Generation
Hole
Conduction electron
Dr. Vincent Chang (張文清)
Carrier Recombination
Hole
Conduction electron
Dr. Vincent Chang (張文清)
Carrier Recombination
Hole
Conduction electron
Dr. Vincent Chang (張文清)
Carrier Recombination
Dr. Vincent Chang (張文清)
Carrier Recombination
Valence electron
Dr. Vincent Chang (張文清)
Minority Carrier Diffusion
Highconcentration
Lowconcentration
Dr. Vincent Chang (張文清)
Minority Carrier Distribution
Highconcentration
Lowconcentration
Dr. Vincent Chang (張文清)
Minority Carrier
Dr. Vincent Chang (張文清)
Minority-Carrier Storage Effect
Vincent Chang
Zero Bias
• Thermal equilibrium
Forward Bias
• Physical meaning
• Distribution
Reverse Bias
• Distribution• Saturation current
Dr. Vincent Chang (張文清)
Outline
Dr. Vincent Chang (張文清)
Minority Carrier (Fig.3-16b, P144)
Dr. Vincent Chang (張文清)
Minority Carrier (Fig.3-16b, P144)
Dr. Vincent Chang (張文清)
Physical Concept (Take Note)
Highconcentration
Lowconcentration
Dr. Vincent Chang (張文清)
Physical Concept
Hole diffusion
Highconcentration
Lowconcentration
Dr. Vincent Chang (張文清)
Physical Concept
Hole diffusion
Highconcentration
Lowconcentration
Dr. Vincent Chang (張文清)
Physical Concept
Electron diffusionHole diffusion
Highconcentration
Lowconcentration
Dr. Vincent Chang (張文清)
Minority Carrier Diffusion Current
Electron diffusionHole diffusion
Dr. Vincent Chang (張文清)
Reverse Saturation Current
Electron diffusionHole diffusion
Dr. Vincent Chang (張文清)
pn Junction Diode
Dr. Vincent Chang (張文清)
Circuit Symbol
Dr. Vincent Chang (張文清)
Circuit Symbol
Dr. Vincent Chang (張文清)
Diode Current and Voltage
I
Dr. Vincent Chang (張文清)
Current-Voltage Characteristic
)1( TVV
S eII
Dr. Vincent Chang (張文清)
Device Parameters
)1( TVV
S eII
Saturation current
Thermal voltage
Dr. Vincent Chang (張文清)
Forward Bias
)1( TVV
S eII
Dr. Vincent Chang (張文清)
On
Forward Bias
)1( TVV
S eII
Dr. Vincent Chang (張文清)
Reverse Bias
)1( TVV
S eII
Dr. Vincent Chang (張文清)
Off
Reverse Bias
)1( TVV
S eII
Dr. Vincent Chang (張文清)
I-V Characteristic
)1( TVV
S eII
Dr. Vincent Chang (張文清)
)1( TVV
S eII
Saturation Current
An
n
Dp
piS NL
DNL
DAqnI 2
Dr. Vincent Chang (張文清)
)1( TVV
S eII
Saturation Current
An
n
Dp
piS NL
DNL
DAqnI 2
Dr. Vincent Chang (張文清)
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