How a chip gets made: printed with light, layer on layer

How a chip gets made: printed with light, layer on layer

Every chip starts as a plain disc of silicon.

It gets a coat that reacts to light. Light through a mask prints the pattern, the printed part is cut into the silicon, and the whole thing is repeated layer after layer. That is how 28 billion transistors fit on one Apple M4.

Save it for the next time someone asks what a fab does.

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