Quasi-Fermi Levels Explained

If you want to see more of these videos, or would like to say thanks for this one, the best way you can do that is by becoming a patron - see the link above :). And a huge thank you to all my existing patrons - you make these videos possible. Quasi-Fermi levels allow us to extend the idea of the Fermi energy to non-equilibrium conditions when the original concept of a single Fermi energy breaks down. It is a fundamental and heavily-used concept in optoelectronics when you almost never operate at or near equilibrium. This is part of my series on semiconductor physics (often called Electronics 1 at university). This is based on the book Semiconductor Physics and Devices by Donald Neamen, as well as the EECS 170A/174 courses taught at UC Irvine. Hope you found this video helpful, please post in the comments below anything I can do to improve future videos, or suggestions you have for future videos.