Beyond the fab: the supply chain every fab needs
The materials, chemicals, gases, parts and services a fab consumes every day, and why so much of it has to be local.
When a new fab is announced, the headline is the building and the investment figure. But a fab cannot run on its own. Every day it consumes materials, chemicals, gases, parts and services, much of which must come from nearby. The world's successful semiconductor clusters are as much about this supporting network as about the fabs themselves.
What a fab consumes
| Category | Examples | Why it is hard |
|---|---|---|
| Silicon wafers | Prime wafers for production; test and monitor wafers | A few global makers dominate; flatness and purity specs are extreme |
| Photoresists and lithography materials | Resists, anti-reflective coatings, developers | Highly concentrated supply, much of it in Japan; limited shelf life |
| Wet chemicals | Sulphuric acid, hydrogen peroxide, hydrofluoric acid, ammonia, isopropyl alcohol | Impurities measured in parts per trillion; purity can degrade in transport |
| Specialty gases | Nitrogen trifluoride, tungsten hexafluoride, silane, neon, dopant gases | Toxic or reactive; need specialised handling and delivery |
| CMP consumables | Slurries and polishing pads | Tuned to each process step; tight lot-to-lot consistency |
| Quartz and ceramic parts | Furnace tubes, wafer boats, etch chamber parts | Consumed continuously; must be cleaned or replaced to strict schedules |
| Sputtering targets | High-purity metals for PVD | Ultra-high purity metallurgy |
The services around the tools
Materials are only half of it. A fab also relies on a range of local services:
- Tool hook-up and installation. Connecting each tool to power, gases, chemicals, water, exhaust and the fab's data systems.
- Field service and spare parts. When a tool goes down, every hour costs output. Engineers and parts need to be close.
- Parts cleaning and refurbishment. Chamber parts collect deposits and must be precision-cleaned, re-coated and returned, in a constant cycle.
- Wafer reclaim. Fabs run large numbers of test and monitor wafers to check tools and processes. Reclaim companies strip those wafers, re-polish them and send them back for reuse, several times over. This saves cost and reduces waste.
- Utilities and waste. Operation of ultrapure water plants, gas plants, abatement systems and wastewater treatment.
- Calibration and analytical labs. Testing the purity of incoming chemicals and gases and calibrating instruments.
Why local supply matters
Some of this can be imported. Much of it cannot, at least not economically or reliably.
- Purity. High-purity chemicals can pick up contamination in long supply chains. Shorter routes are safer.
- Shelf life and handling. Some materials, including many photoresists, need controlled temperatures and have limited shelf life.
- Response time. Service, spare parts and parts cleaning work on turnaround times measured in hours or days.
- Volume. Bulk chemicals, gases and reclaimed wafers move in large quantities, so freight costs and lead times add up.
- Resilience. A single disruption in a distant supplier can stop a fab.
Lessons from the established clusters
Hsinchu, Taiwan. TSMC's home base grew alongside hundreds of local suppliers of materials, chemicals and equipment service, many within easy driving distance. Proximity speeds up problem-solving between fab and supplier.
South Korea. In July 2019, Japan tightened export controls on three materials critical to Korea's chipmakers: hydrogen fluoride, photoresists and fluorinated polyimide. Korea responded with a major push to develop domestic suppliers, sharply increasing local production of some of these materials within a few years.
Dresden, Germany. "Silicon Saxony" grew over decades around a few anchor fabs into a network of hundreds of supporting companies, and that network has helped attract new fab investment in recent years.
The common thread: the ecosystem was built alongside the fabs, and it compounded over time into faster ramps, better yields and more resilience.
Where India stands
India's fabs and OSATs are funded and under construction. Most of the materials, chemicals, equipment service and specialist talent they will need are not yet available locally. That gap is a challenge for the new fabs, and an opportunity for companies that move early: global suppliers setting up in India, and Indian industrial companies entering semiconductor-grade production with the right technology partners.
In the final part, we look at the single number that decides whether all of this investment pays off: yield.
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