https://electronics.howstuffworks.com/diode.htm
Answer the following:
Why do some materials conduct electricity/current, why do some materials insulate from electricity/current, and why do some materials semi-conduct electricity/current?
What you believe to be the most amazing use of semi-conductor technology (this could include mini, micro, and nanotechnology) in use today, or being developed for future uses. List the Internet, and other resources.