Demonstration article

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A microchip begins as a disc of extremely pure silicon and ends as a device containing a vast number of transistors, each far too small to see. Between those points lie hundreds of steps: depositing thin layers of material, patterning them with light, etching away what is not needed and repeating the cycle again and again.

Each step must be performed with extraordinary precision. A speck of dust or a slight variation in temperature can ruin a chip. Plants are built around clean rooms with air filtered far beyond hospital standards, and engineers spend much of their time hunting for the tiny sources of defects that reduce the share of usable chips, known as yield.

Know-how that does not travel easily

Much of what makes a leading plant work is not written down. It is held by teams who have learned, through long iteration, how to tune equipment and processes for a particular generation of technology. That tacit knowledge is one reason why governments that subsidise new plants often find the hardest part is not construction but reaching reliable, high-yield production.

A chip factory can be built in a few years. The expertise to run it well takes far longer to grow.

The industry also depends on a narrow set of specialised suppliers: makers of lithography machines, ultra-pure chemicals and gases, and design software. Some of these occupy positions where few or no alternatives exist, which gives the countries that host them considerable influence over who can make the most advanced chips.

Division of labour

Over time the industry has split into specialists. Some firms design chips but do not make them; others manufacture designs for many customers; still others focus on packaging and testing. This division lowered costs and spread risk, but it also made the supply chain more geographically concentrated at certain stages.

Stages of the chip supply chain

Design: architects specify the circuits using specialised software.

Fabrication: wafers are processed in clean-room plants.

Assembly and testing: chips are cut, packaged and checked.

Equipment and materials: the machines, chemicals and gases every stage relies on.

For policymakers seeking self-sufficiency, the lesson is that no single plant buys independence. Resilience requires an ecosystem — engineers, suppliers, universities and customers — and those take patient investment to build. There is also the question of demand: a plant needs customers willing to commit to its output before it has proved itself, and buyers accustomed to established suppliers are often reluctant to take that risk. Industrial policy that funds buildings but neglects skills, supplier networks and early customers may produce impressive facilities that struggle to compete.