Recommended
How do they make Silicon Wafers and Computer Chips?
Why people recommend it
This older How It's Made segment is recommended as a clear look at growing silicon crystals and cutting them into wafers for chips.
Watch for: Covers wafers more than later chip fabrication steps
In their words
Here's a good video to watch, How Silicon Wafers are Made.
Garrett Fogerlie on electronics.stackexchange.com, Dec 2012. CC BY-SA.