Physics
Chapter 29: All
Web Lecture
Introduction
It was during the progress of investigations relating to electro-chemical decomposition, which I still have to submit to the Royal Society, that I encountered effects due to a very general law of electric conduction not hitherto recognized, and though they prevented me from obtaining the condition I sought for, they afforded abundant compensation for the momentary disappointment by the new and important interest which they gave to an extensive part of electrical science.
Michael Faraday — On a new law of electric conduction, on discovering that conducting power of silver sulfide increases with temperature, while the conductivity of metallic conductors decreases with temperature, 1833
Web Lecture (Under Revision)
The All About Circuits site has a good discussion on band solids.
You may find Horset Wahl's QuarkNet presentation discussion on semiconductors, diodes, and transistors useful in organizing these concepts
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