Lecture 13 P-N Junction Diodes: Part 3 Current ... - ECE Users Pages
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Lecture 13 P-N Junction Diodes: Part 3 Current ... - ECE Users Pages
P-n Junction I-V Characteristics. Electron Diffusion. Current. Electron Drift.
Current. Hole Diffusion. Current. Hole Drift. Current. In Equilibrium, the Total
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Lecture 13 P-N Junction Diodes: Part 3 Current Flowing through a Diode Reading: Pierret 6.1
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P-n Junction I-V Characteristics In Equilibrium, the Total current balances due to the sum of the individual components Electron Drift Current
Hole Diffusion Current
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Electron Diffusion Current
Hole Drift Current
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P-n Junction I-V Characteristics
Electron Drift Current
Hole Diffusion Current flow is Current
Electron Diffusion Current Current flow
Hole Drift Current
is proportional to e(Va/Vref) due to the exponential decay of carriers into the majority carrier bands
dominated by majority carriers flowing across the junction and becoming minority carriers QuickTime Movie
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P-n Junction I-V Characteristics Current flow is constant due to thermally generated carriers swept out by Efields in the depletion region
Electron Drift Current
Electron Diffusion Current negligible due to large energy barrier
Hole Diffusion Current negligible due to large energy barrier
Current flow is dominated by minority carriers flowing across the junction and becoming majority carriers Georgia Tech
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P-n Junction I-V Characteristics Where does the reverse bias current come from? Generation near the depletion region edges “replenishes” the current source.
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P-n Junction I-V Characteristics Putting it all together Forward Bias: Current flow is proportional to e(Va/Vref) due to the exponential decay of carriers into the majority carrier bands
Reverse Bias: Current flow is constant due to thermally generated carriers swept out by E-fields in the depletion region Current flow is zero at no applied voltage
