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Semiconductors

How Does a Transistor Work? Excellent introduction to semiconductors. YouTube 6 minutes from Veritasium 5 Star
How transistors work link This one is from TED-Ed. YouTube 5 minutes 4 Star
       
Normal Silicon lattice (undoped)
Diagram from absorblearning.com
4 Star
Silicon doped with Phosporus
Diagram from absorblearning.com
4 Star
Silicon doped with Boron
Diagram from absorblearning.com
4 Star
How a depletion layer is formed Simple simulation from absorblearning.com
4 Star
Diode in forward bias
Simple circuit plus development of graph from absorblearning.com
4 Star
Graph for a semiconductor diode
Diagram from absorblearning.com
4 Star
 
   
How the first transistor worked Link YouTube 5 minutes via engineer guy  
Introduction to transistors Simple but useful animations
4 Star
Video introduction to formation of PN junction YouTube 4 minutes. 3 Star
How a smoke detector works YouTube 4 minutes. Involves radioactivity and semiconductors 4 Star
 
   
Semiconductors
Shine a light on the metal and watch as the conductivity increases
4 Star
Introduction to some electronic devices Diodes, light emitting diiodes (leds), and light dependant resistors (ldrs). Up to and includes the mandatory expt.
From the John Hennessy at juniorscience.ie. Excellent resource.
5 Star
Me using the site above MyYouTube. 9 mins  
Using diodes as polarity indicators MyYouTube. 3 mins  
Electron Band Structure In Germanium, My Ass
Student's report of an experiment which didn't quite go to plan. Very, very funny
5 Star
History of 50 years of the LED. 4 mins audio file. 3 Star
Making LED Street Art From HardScience on Youtube 3 Star
 
   
Britney Spears' Semiconductors website
Not many people know that Britney Spears has a degree in Physics, but gave up this glamorous lifestyle for music!
3 Star
       
Current-Voltage characteristic for a diode: Leaving cert experiment MyYouTube. 9 mins  
       
Mandatory Expt: Resis versus Temp for themistor From mathsphysics.com