09+PN+junction+electrostatics

09+PN+junction+electrostatics - EECS 320 Electrostatics...

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EECS 320 Electrostatics Review
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Electrostatics Review Gauss’s Law ε – permittivity of material () ρ ε = dx d E E – Electric field ρ – charge density q =1.6 × 10 -19 C, elemental charge dx dV = E E q F = qdV dx q dW = = E Poisson’s Equation Potential Energy qV E P = . . dx dE q 1 = E = 2 2 dx V d Recall that electrostatic potential, potential energy, etc are relative to an arbitrary point of reference
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Electrostatics Review Poisson’s Equation ε ρ = 2 2 dx V d Given charge density, Integrate once to get electric field Integrate twice to get electric potential (and energy)
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Electrostatics Examples Parallel Plate Capacitor Sketch charge density, field, and electric potential for the following: 0W -+ Air V 0 W/4 W/4 Conductor V 0 Ground Ground
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EECS 320 P-N Junction Electrostatics
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Diode It is desirable to have a rectifying device i.e., A one way valve Easy flow Difficult flow Forward direction Reverse direction Need a physical junction for such a device
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Diode For electronics, need a one way valve for current Ideal behavior: I V How do we implement in a semiconductor? Vary spatial composition (e.g. doping) N P
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Joining P-type and N-type What happens when you join p-type and n-type material?
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This note was uploaded on 08/09/2011 for the course EE 320 taught by Professor Zhongzhaohui during the Summer '11 term at Shanghai Jiao Tong University.

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09+PN+junction+electrostatics - EECS 320 Electrostatics...

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