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Ideal currents in a pn Junction

Ideal currents in a pn Junction. Debye length. +. -. +. +. +. +. +. +. +. +. -. -. -. -. -. -. -. -. +. Debye length. +. -. +. +. +. +. +. +. +. +. -. -. -. -. -. -. -. -. +. Transient sheath in ion acoustic wave experiments in a plasma. Charge neutrality.

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Ideal currents in a pn Junction

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  1. Ideal currents in a pn Junction

  2. Debye length + - + + + + + + + + - - - - - - - - +

  3. Debye length + - + + + + + + + + - - - - - - - - +

  4. Transient sheath in ion acoustic wave experiments in a plasma

  5. Charge neutrality Approaches zero

  6. MATLAB calculation

  7. Review of pn junctions reverse & forward bias

  8. Metallurgical junction Basic model p n

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

  10. p n E Basic model – thermal equilibriumno applied bias voltage Thermal equilibrium implies Fermi energies are the same. Energy

  11. p p n n E Reverse biased PN junction

  12. Reverse biased PN junctionenergy diagram

  13. p n p n E Forward biased PN junction - + Electron flow Hole flow

  14. Forward biased PN junctionenergy diagram - +

  15. Schottky barrier junctionThermal equilibrium n Energy - Depletion width

  16. n n n Schottky barrier junction

  17. Characteristics of a Schottky diode and a PN junction diode

  18. Basic assumptions p n Low injection

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

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

  21. p n Basic assumptions

  22. Summary

  23. p n Electron energy profile

  24. p n Charge concentration Complete ionization

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

  26. p n p n Forward biased PN junction

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

  28. p n p n Forward biased PN junction Similarly

  29. p n p n Forward biased PN junction

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

  31. 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

  32. Evolution of the density perturbations Minority carrier diffusion lengths

  33. Evolution of the density perturbations Minority carrier diffusion lengths

  34. Currents – sum of hole and electron diffusion currents

  35. Currents – sum of hole and electron diffusion currents

  36. The Cowasaki gets excellent gas mileage.

  37. Simple three-dimensional unit cell

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