# Semiconductor Fabrication Semiconductor fabrication is the process of manufacturing chips — building up and etching billions of [[Transistor]]s onto silicon wafers through hundreds of precise steps in a "fab" (fabrication plant). It is arguably the most demanding manufacturing on Earth: a leading-edge fab costs $20–40 billion, must operate in air thousands of times cleaner than a hospital, and depends on extreme-ultraviolet (EUV) lithography machines made by a single company (ASML, in the Netherlands). The industry splits into "fabless" firms that only *design* chips (NVIDIA, Apple, AMD, Qualcomm) and "foundries" that only *manufacture* them to order — a division that concentrates the hardest, most strategic step in very few hands. ## Why it matters here Fabrication is the chokepoint inside the chokepoint, and understanding it is the key to the whole semiconductor-geopolitics story the vault tracks. **The Taiwan concentration ("the silicon shield").** [[TSMC]], in [[Taiwan]], manufactures the large majority of the world's most advanced chips — the leading-edge logic that every fabless designer depends on. This single-island, single-company concentration is why a [[Taiwan]] conflict would be a global economic catastrophe, and the dependency is sometimes called Taiwan's "silicon shield" (the theory that its chip indispensability deters a Chinese invasion). It is the most consequential single point of failure in the modern economy. **The control points and export controls.** Because fabrication depends on a thin chain of irreplaceable inputs — ASML's EUV machines, US design software and tools, a few materials suppliers — the US can throttle China's ability to *make* advanced chips by denying access to that equipment, not just the finished chips. This is the deep logic of [[Chip Export Controls]]: deny the *means of production*, not only the product. **Re-shoring.** The [[CHIPS and Science Act]] subsidizes building fabs on US soil (TSMC in Arizona, Intel, Samsung) to reduce the Taiwan dependency — an explicit, expensive bet that fabrication is too strategic to leave concentrated abroad, and another instance of national-security logic overriding free-market preference on the right. ## See Also - [[Semiconductor]] — the product fabrication makes - [[Chip Export Controls]] — denying the means of fabrication to China - [[CHIPS and Science Act]] — the US fab re-shoring subsidy - [[TSMC]] · [[Taiwan]] — the concentration at the heart of the risk