Lecture11-P-N Junction 1

Lecture11-P-N Junction 1 - Electrostatic Potential V...

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ECE 3040 - Dr. Alan Doolittle Georgia Tech Lecture 11 P-N Junction Diodes: Part 1 How do they work? (postponing the math) Reading: Pierret 5.2
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ECE 3040 - Dr. Alan Doolittle Georgia Tech Our First Device: p-n Junction Diode N-type material P-type material N-type material P-type material A p-n junction diode is made by forming a p-type region of material directly next to a n-type region.
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ECE 3040 - Dr. Alan Doolittle Georgia Tech Our First Device: p-n Junction Diode N D -N A x -N A N D E c E i E f E v E c E i E f E v In regions far away from the “junction” the band diagram looks like: Junction
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ECE 3040 - Dr. Alan Doolittle Georgia Tech Our First Device: p-n Junction Diode E c E i E f E v E c E i E f E v But when the device has no external applied forces, no current can flow. Thus, the fermi-level must be flat! We can then fill in the junction region of the band diagram as: or…
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ECE 3040 - Dr. Alan Doolittle Georgia Tech Our First Device: p-n Junction Diode E c E i E f E v
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ECE 3040 - Dr. Alan Doolittle Georgia Tech E c E i E f E v Our First Device: p-n Junction Diode
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Unformatted text preview: Electrostatic Potential, V = -(1/q)(E c-E ref ) X V BI or the “built in potential”-qV BI ECE 3040 - Dr. Alan Doolittle Georgia Tech Our First Device: p-n Junction Diode Electrostatic Potential, V=-(1/q)(E c-E ref ) X V BI or the “built in potential” X Electric Field E =-dV/dx ECE 3040 - Dr. Alan Doolittle Georgia Tech Our First Device: p-n Junction Diode Poisson’s Equation: o s o s K dx dE D in or K E ε ρ = = • ∇ , 1 Electric Field Charge Density (NOT resistivity) Permittivity of free space Relative Permittivity of Semiconductor (previously referred to as ε R ) ρ =q( p – n + N D – N A ) ECE 3040 - Dr. Alan Doolittle Georgia Tech Our First Device: p-n Junction Diode X Electric Field, E =-dV/dx X dx dE K o s ε ρ= ECE 3040 - Dr. Alan Doolittle Georgia Tech Energy Potential Electric Field Charge Density-1/q-dV/dx dx dE K o s ε Our First Device: p-n Junction Diode...
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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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Lecture11-P-N Junction 1 - Electrostatic Potential V...

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