It's the simplest semiconductor device made. It ushered in the age of radio, the electronic valve that rectifies and regulates - the diode!
MAKE presents: The Diode
The PN Junction. How Diodes Work? (English version)
What is a diode?
Lecture - 2 Diode
Diode Introduction for Circuit Analysis
Diode Circuit Analysis
Diode Model Examples
How to use a Diode