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A silicon crystal is grown in a crucible of fused quartz, and any impurity in that crucible ends up in the chip. Only a few deposits on the planet are clean enough. The sand is not the product — it is the container the product is grown in, and it is consumed every time.
- 소재
- High-Purity Quartz
- 유형
- High-purity quartz sand, impurities measured in parts per million
- 출발지
- United States — Spruce Pine, North Carolina — the source of most of the world's crucible-grade quartz
단계별, 국경별
United States · Spruce Pine, North Carolina 보유자 Quartz producers (채굴업체)
An unremarkable-looking quarry
Pegmatite is mined and the quartz separated from feldspar and mica. It then goes through a long purification sequence — flotation, acid leaching, chlorination — to strip aluminium, iron, titanium and sodium down to parts per million.
왜 이곳인가: An accident of geology. These pegmatites formed with unusually little of the trace elements that ruin quartz for this purpose.
Germany · Fused-quartz manufacturers 보유자 Crucible makers (제조사)
Made into crucibles
The sand is fused into crucibles — bowls that will hold molten silicon while a crystal is pulled from it.
왜 이곳인가: Fused-quartz manufacture is its own specialised industry, separate from both mining and chipmaking.
China · Polysilicon plant 보유자 Polysilicon producers (화학)
Meanwhile, the silicon itself
Ordinary quartzite is reduced with carbon to metallurgical silicon at about 99%, then converted to trichlorosilane, distilled and redeposited as polysilicon — up to eleven nines of purity for semiconductors.
나머지는 어떻게 되었는가: This step is essentially electricity turned into purity, which is why it migrated to wherever power is cheapest.
왜 이곳인가: Solar-grade polysilicon needs six or seven nines; semiconductor-grade needs eleven. The extra nines are what separate the two industries.
Japan · Crystal growers 보유자 Wafer manufacturers (제조사)
Growing the crystal
Polysilicon is melted in the quartz crucible and a seed crystal is slowly pulled and rotated out of it, growing a single cylindrical crystal up to 300 mm across and two metres long.
나머지는 어떻게 되었는가: The crucible is consumed. That is the whole reason this journey starts at a sand quarry rather than a silicon plant.
왜 이곳인가: Crystal growing is dominated by a small number of Japanese, Korean, German and Taiwanese firms.
Taiwan · Fab, Hsinchu or Tainan 보유자 Foundry (제조사)
Hundreds of steps on a wafer
Deposition, lithography, etch, repeated hundreds of times, building transistors and copper wiring layer by layer. Tungsten fills the contacts; hafnium oxide forms the gate dielectric; neon lases the light that prints the pattern.
왜 이곳인가: Leading-edge fabs are among the most capital-intensive facilities ever built and exist in very few places.
Vietnam · Assembly and test, then the world 보유자 Assemblers and device makers (제조사)
Millions of chips
Wafers are diced, packaged, tested and soldered onto boards. From 1,000 kg of a specific sand from one American county, a few million finished chips.
왜 이곳인가: Six countries and roughly six months, for something that weighs a few grams.
이것은 작업 예시이다. 공표된 출발 수량을 공표된 일반적인 수율 및 회수율에 따라 추적한 것이므로 비율은 검증 가능하다. 특정 선적 기록이 아니다. 경로 사실—어느 나라, 어떤 공정, 그리고 왜 해당 소재를 다른 곳에서 처리할 수 없는지—은 공개 보고를 바탕으로 정리되었다.