Lecture13-p-n Junctions 3

Lecture13-p-n Junctions 3 - due to large energy barrier...

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ECE 3040 - Dr. Alan Doolittle Georgia Tech Lecture 13 P-N Junction Diodes: Part 3 Current Flowing through a Diode Reading: Pierret 6.1
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ECE 3040 - Dr. Alan Doolittle Georgia Tech P-n Junction I-V Characteristics Electron Diffusion Current Electron Drift Current Hole Diffusion Current Hole Drift Current In Equilibrium, the Total current balances due to the sum of the individual components
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ECE 3040 - Dr. Alan Doolittle Georgia Tech Electron Diffusion Current Electron Drift Current Hole Diffusion Current Hole Drift Current Current flow is proportional to e (Va/Vref) due to the exponential decay of carriers into the majority carrier bands P-n Junction I-V Characteristics Current flow is dominated by majority carriers flowing across the junction and becoming minority carriers QuickTime Movie
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ECE 3040 - Dr. Alan Doolittle Georgia Tech P-n Junction I-V Characteristics Electron Diffusion Current negligible due to large energy barrier Electron Drift Current Hole Diffusion Current negligible
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Unformatted text preview: due to large energy barrier Hole Drift Current Current flow is constant due to thermally generated carriers swept out by E-fields in the depletion region Current flow is dominated by minority carriers flowing across the junction and becoming majority carriers QuickTime Movie ECE 3040 - Dr. Alan Doolittle Georgia Tech P-n Junction I-V Characteristics Where does the reverse bias current come from? Generation near the depletion region edges replenishes the current source. ECE 3040 - Dr. Alan Doolittle Georgia Tech P-n Junction I-V Characteristics Putting it all together Reverse Bias: Current flow is constant due to thermally generated carriers swept out by E-fields in the depletion region Forward Bias: Current flow is proportional to e (Va/Vref) due to the exponential decay of carriers into the majority carrier bands Current flow is zero at no applied voltage I=I o (e Va/Vref- 1)...
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This note was uploaded on 08/23/2011 for the course ECE 3040 taught by Professor Doolittle during the Spring '11 term at University of Florida.

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Lecture13-p-n Junctions 3 - due to large energy barrier...

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