New version of Lecture 5. Corrected symbols in page 19 (N -> D) 13th of October.
New version of Lecture 7. Reorganised material to show surface recombination as a main class 27th of October. Also edited slides 4 and 5 to show that division more clearly. Removed two slides from exciton discussion to lecture 8.
These are the visiting companies' presentations. They are not part of the course material.