The document is the notes from a class session covering drift and diffusion currents in semiconductors. It introduces the concepts of drift and diffusion currents, the Einstein relationship for semiconductors, diffusion length of excess carriers, and the continuity equation. It provides a link to a YouTube video explaining drift and diffusion currents further. The next class will cover transition and diffusion capacitance, switching characteristics, and breakdown in PN junction diodes.

3. R.M.K COLLEGE OF ENGINEERING
AND TECHNOLOGY
DEPARTMENT OF ECE
EC8252-ELECTRONIC DEVICES
SECOND SEMESTER-I YEAR- (2020-2024 BATCH)
Mrs. P.Sivalakshmi AP/ECE
SESSION:9
DATE: 26.04.2021

4. Contents:
Drift & Diffusion Currents of a semiconductor
Einstein Relationship for Semiconductor
Diffusion Length of excess charge carriers
Continuity Equation/current equation

5. Drift & Diffusion Currents

6. Drift & Diffusion
Currents

8. https://www.youtube.com/watch?v=wpAA3qeOYiI

9. Diode Current
Equation

15. Diode current equation

17. Next session:
Transition & Diffusion capacitance
Switching Characteristics
Breakdown in PN Junction Diodes
Problems