2. Basic model p n +-

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

4. Basic assumptions pn

5. Basic model notation p n

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

9. Currents – sum of hole and electron currents

11. Reverse saturation current These are minority carrier diffusion currents only.

12. These are minority carrier diffusion currents only. p n Majority carriers are defined as the following. The existence of a diffusion current implies an inhomogeneous density profile resulting in a nonzero electric field.

13. Majority carriers p n Majority carrier electron current Majority carrier hole current I Minority carrier diffusion current Minority carrier diffusion current Holes are injected from the p region Electrons are injected from the n region

14. Currents – sum of hole and electron currents Reverse saturation current

15. Currents – sum of hole and electron currents

17. Europeans are very interested in the American election. This is a float in a parade in Germany.

19. Simple three-dimensional unit cell