Sub-system
Before there is a wafer there is a rod of polycrystalline silicon purified to a level with few parallels in industry — roughly one impurity atom in a hundred billion. It is made by a handful of producers, and the solar industry's much larger supply of similar-looking material is not usable for it.
In one sentence
Electronic-grade polysilicon is polycrystalline silicon refined to semiconductor purity, typically eleven nines or better, produced by decomposing a purified silicon-bearing gas onto heated seed rods and used as the feedstock for single-crystal growth.
The route runs from metallurgical silicon, smelted from quartz, through conversion into trichlorosilane, repeated distillation of that gas, and finally deposition back onto heated silicon rods over several days. The purification happens in the distillation: it is far easier to purify a gas than a solid, which is why the process takes such an indirect path.
Purity requirements differ from solar by orders of magnitude. Solar-grade material tolerates impurity levels that would make a transistor unusable, so the two markets draw on related technology and are commercially separate — a glut in one does not relieve tightness in the other.
Deposition runs reactors at over a thousand degrees for days at a time, and the distillation columns run continuously. Electricity is a dominant input cost, which is why producers site plants where power is cheap and why the geography of the industry follows energy prices as much as anything else.
A small number of producers supply the electronic grade, with plants that take years to build and qualify. Because the material is qualified into a wafer maker's crystal-growth process, changing supplier is a validation exercise rather than a purchase — the same lock-in pattern that runs through every materials page in this branch.
Technology dependencies are solved by engineering; supply dependencies are solved by building something, which takes years.
The chain starts with silicon smelted from quartz before any purification happens. Feedstock quality sets how much distillation is needed to reach electronic grade.
Critical minerals and rare gasesReactors run above a thousand degrees for days and the distillation columns never stop. Power is the dominant input cost, which is why plants are sited where it is cheap rather than where the customers are.
Grid infrastructureOther pages in this map that name Electronic-grade polysilicon as something they cannot do without.
What each company supplies at this step, and — where a public figure exists — its share of this specific market — with what that share measures, the period it covers and who published it. Some rows also show the company’s own reported revenue for the segment covering this step, which is a different thing: it says how much this business matters to that company, not how much of the market it holds. Not a ranking and not a recommendation.
Produces electronic-grade polysilicon for the semiconductor wafer industry.
Produces high-purity polysilicon for semiconductor use.
Produces polysilicon across semiconductor and solar grades.
Consumes electronic-grade polysilicon as feedstock for its wafer business.
The main US source of electronic-grade material, and the reason the supply is not entirely outside the country.
Supplies electronic-grade polysilicon alongside the crucibles and targets used further down the same line.
Holds Western capacity for the silane route, which is the input for the semiconductor grade rather than the solar one.
Each page explains one technology in plain language, states what it depends on, and names companies by what they supply at that step. Company roles are described qualitatively and deliberately carry no market shares, revenue figures or rankings — those change faster than an explainer can, and a stale number is worse than none. Ticker links point at company pages on this site and are provided for reference only.
Nothing here is investment advice, a recommendation, or a forecast. A company named on a page about a technology is not thereby a good investment, and the chokepoints described are structural facts about supply chains rather than predictions about prices. Technology moves; where a page describes something as unresolved or in development, that was true when it was written.
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