pn_junction_2 - PN Junctions P-Type Semiconductor p ~ NA EC...

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E C E V E G E F P-Type Semiconductor p ~ N A E C E V E G E F N-Type Semiconductor n ~ N D E C E V E G E F n n ~ N D E C E V E G E F pn Junction p p ~ N A qV bi PN Junctions
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E C E V E G n n ~ N D E C E V E G E F p p ~ N A qV bi PN Junction Electrostatics W (depletion width) + + + + + + + + + + + + - - - - - - - - - - - - ρ = -q N A ρ = +q N D Electric Field Voltage V bi Charge Density
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E G E F n n ~ N D E C E V E G E F p p ~ N A PN Junction Reverse Bias W (depletion width) q(V bi - V D ) + - V D < 0 Voltage V bi V D < 0 V D = 0 V D
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E G E F n n ~ N D E C E V E G E F p p ~ N A q(V bi - V D ) PN Junction Forward Bias W (depletion width) + - V D > 0 V D > 0 V D = 0 V D V bi
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W depl = x n + x p x n = ((2 ε Si (V bi - V D )/q) (N A /N D ) / (N A +N D ) ) 1/2 x p = ((2 ε Si (V bi - V D )/q) (N D /N A ) / (N A +N D ) ) 1/2 ε Si = K si ε 0 = 11.8 x 8.854 x 10 -14 f/cm W depl = (2 ε Si (V bi - V D )/q (1/N A +1/N D ) ) 1/2 V bi = built-in potential = kT/q ln(N A N D /n i 2 ) W (depletion width)
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This note was uploaded on 03/25/2011 for the course ECE 305 taught by Professor Melloch during the Spring '08 term at Purdue University-West Lafayette.

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pn_junction_2 - PN Junctions P-Type Semiconductor p ~ NA EC...

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