Lec11 PN junction electrostatics

Lec11 PN junction electrostatics - EECS 320 P-N Junction...

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EECS 320 P-N Junction Electrostatics
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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? PN e - diffuse h + diffuse Ionized acceptors Ionized donors E Diffusion drives e’s and h’s to lower concentration regions Ionized dopants remain, creating an electric field Under equilibrium, diffusion and drift processes are balanced
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Energy Band Picture
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Energy Band in Equilibrium
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Energy Band Diagram p-type n-type E vac E vac P N V bi E V E C E F q φ p q χ q φ n E C E C E f E G E V E V E f
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Built-In Potential P N V bi E V E C E F p V F n F C G bi E E E E E qV ) ( ) ( = = C D n F C N N kT E E ln ) ( = V A p V F N N kT E E ln ) ( = kT E N N n G V C i exp 2 = 2 ln i A D bi
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Lec11 PN junction electrostatics - EECS 320 P-N Junction...

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