As the crystal grows, the two rotations keep happening, while the mechanical device is very slowly lifted out of the pool of Crystal Liquid. So, that's why wafers are circular. When they grow Silicon crystal, it starts as a liquid, and rotates its way out as it becomes a solid. So there you have it!

Why are wafers round and not square?

The silicon ingots that are used to grow the wafer are circular in shape. This is due to the process of dipping a seed crystal into molten silicon and rotating and slowly extracting as the crystal grows. ... Since the product is already circular in shape, the wafers are cut into that same shape.

Why are processors Square and wafers circular?

Processor wafers are made out of silicon, or more precisely melted sand, which according to Intel has a “high percentage of silicon in the form of silicon dioxide”. ... Those enormous silicon ingots are then sliced into individual wafers, each only 1mm thick. And that's why silicon wafers are circular.