I just bought a silicon wafer off of eBay to decorate my office. The seller didn't tell/know, but I'm dead curious as to what this wafer is. Could anyone help me identify which chips should have been built out of it?
Full picture
Here's a picture of the entire 12" wafer.
Poor man's macro
Here's a zoomed-in picture of the lighter rectangles that are scattered over this wafer. I took it using a super cheap magnifying glass.
Another poor man's macro
Here's another angle trying to show both the light and dark rectangles. Unfortunately I only have a smallish magnifying glass so I can't see any better.
Extra info
- This is a 300 mm wafer
- I couldn't find any marking on the front side
- The backside has a serial number (
K444R215WFB3
) and a QR code that's so small I couldn't decipher it. - The dark rectangles probably have something drawn in them, but it's impossible to see it even with a magnifying glass.
Best Answer
The light rectangles are for wafer characterization test. The dark ICs are the actual chips.
As to what those chips are, they appear to be some kind of memory, perhaps DRAM.