Ideal currents in a pn Junction

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Presentation transcript:

Ideal currents in a pn Junction

Debye length + - + - + + -

Debye length + - + - + + -

Transient sheath in ion acoustic wave experiments in a plasma

Approaches zero Charge neutrality

MATLAB calculation

Review of pn junctions reverse & forward bias

Metallurgical junction Basic model p n Metallurgical junction

Basic model p n E Depletion layer all mobile charges disappear - + Depletion layer all mobile charges disappear due to the electric field

Basic model – thermal equilibrium no applied bias voltage Thermal equilibrium implies Fermi energies are the same. Energy

Reverse biased PN junction

Reverse biased PN junction energy diagram

Forward biased PN junction - + Electron flow Hole flow

Forward biased PN junction energy diagram - +

Schottky barrier junction Thermal equilibrium Energy - Depletion width

Schottky barrier junction

Characteristics of a Schottky diode and a PN junction diode

Basic assumptions p n Low injection

Majority carriers -- thermal equilibrium Basic assumptions p n E - + Majority carriers -- thermal equilibrium

Minority carriers -- thermal equilibrium Basic assumptions p n Minority carriers -- thermal equilibrium

Basic assumptions p n

Summary

Electron energy profile

Charge concentration p n Complete ionization

Charge concentration p n Minority carrier concentration is related to majority carrier concentration

Forward biased PN junction

Forward biased PN junction Minority carriers increase electron density in the n region

Forward biased PN junction Similarly

Forward biased PN junction

Forward biased PN junction Similar density equations result from a reverse bias applied voltage. Minority density will be significantly smaller.

Evolution of the density perturbations Diffusion of the perturbation Drift due to the electric field Generation of additional perturbation Collision lifetime Steady-state Neglect drift and generation

Evolution of the density perturbations Minority carrier diffusion lengths

Evolution of the density perturbations Minority carrier diffusion lengths

Currents – sum of hole and electron diffusion currents

Currents – sum of hole and electron diffusion currents

The Cowasaki gets excellent gas mileage.

Simple three-dimensional unit cell