Polysilicon (electronic-grade silicon) (process step)

Step 15 of 56 in the semiconductor flow (Wafer). Prev: Photomask manufacturing (process step) · Next: Crystal growth & ingot (Czochralski/Float-Zone) (process step)

What this step does

This is the raw feedstock step: turn metallurgical-grade silicon (about 98-99% pure, made by carbothermic reduction of quartz) into ultra-pure electronic-grade silicon (EGS) at 11N (99.999999999%) or better, the starting material from which single-crystal ingots are pulled. Without 11N feedstock there is no usable wafer. The sub-processes inside this step:

• Convert metallurgical silicon to a volatile precursor, usually trichlorosilane (TCS, SiHCl3) or silane (SiH4).
• Fractionally distil the precursor to strip boron, phosphorus and metal impurities down to parts-per-trillion.
• Deposit pure silicon back out by chemical vapour deposition: the Siemens process (TCS-CVD onto hot silicon rods) or fluidized-bed reactor (FBR, silane onto seed beads).
• Break, sort, etch and pack into the chunk or granule form the crystal pullers consume.

Where it sits and why it matters

It is the very front of the wafer chain. Solar and semiconductor polysilicon share chemistry, but the purity gap is enormous: solar cells tolerate 6N-9N, while leading-edge logic and memory need 11N with sub-5-ppta net dopant levels (real “12N” is a marketing fiction per Bernreuter [6]). That gap is the entire investment story. EGS is a tiny, slow, hard-to-qualify niche bolted onto a giant, cyclical, China-dominated solar commodity.

Equipment market

There is no large independent EGS tool market: the value-capturing producers build and operate proprietary CVD reactors in-house, so capex is captive, not a third-party equipment pool. Estimated merchant reactor/engineering revenue is low hundreds of millions of dollars a year, lumpy with capacity cycles. Siemens TCS-CVD held ~66% of polysilicon output in 2025; FBR/silane is growing ~14% CAGR but is mostly a solar cost play [2]. Shares below are rough estimates of the merchant reactor-and-engineering layer.

Concentration note: the binding constraint is decades of customer qualification, not tool access. A new entrant cannot buy its way to 11N.

Materials & consumables

This step consumes metallurgical silicon, hydrogen, chlorine/HCl, and electricity (very energy-intensive), and produces the precursors it then re-deposits. The recurring-revenue layers around it:

• TCS and silane gas: the trichlorosilane market was put at ~$7B in 2025 with polysilicon ~43% of it; major EGS producers (Wacker, OCI, Hemlock) make their own precursor, so merchant TCS skews solar/specialty [4].
• Graphite and graphite-felt reactor internals (hot zones, electrodes, insulation), supplied by SGL Carbon and peers, replaced on a maintenance cycle [4].
• Silica crucibles, quartz, and high-purity HCl. These consumables and the energy bill are the genuinely recurring spend; the reactor is a one-off.

Volumes, revenue, profitability

• Volume: semiconductor-grade demand is roughly 33,500 MT in 2025, only ~2.4% of all polysilicon, against ~1.4M+ MT of solar output; solar is 95%+ of the market by volume [1][9]. Total polysilicon capacity hit ~2.26M MT by end-2023 with China at ~93% [3].
• Revenue pool: this is where report-mills mislead. Several put “electronic-grade polysilicon” at $8-10.5B [marketreportsworld, verifiedmarketreports], but 33,500 MT even at a premium $50-150/kg implies a true EGS revenue pool closer to ~$2-5B; treat the $10B figures as conflating broader silicon-materials scope. Rough estimate, flagged.
• Pricing: solar polysilicon collapsed to ~$5/kg (Chinese selling price, ~$1 below cost) vs a ~$24/kg “fair” estimate [7]; EGS commands a large multiple of that, several tens to over a hundred dollars per kg, because of purity and qualification.
• Margins: solar producers are loss-making at the trough; EGS producers earn the margin precisely because they sit out the solar price war. Gross margins on qualified EGS are healthy (estimated 30-50%+ in a normal year) for the few who can make it; the margin is earned by the deposition-and-purification know-how, not the chemistry.

Competitive landscape & value capture

Tight non-Chinese oligopoly at 11N: Wacker (Germany, largest EGS producer, ~22,000 MT semiconductor output) and Hemlock (US, second largest) anchor supply, with OCI/Tokuyama Malaysia, Tokuyama Japan (~12,500 MT) and Mitsubishi covering the rest [4][6]. These four-to-five firms hold essentially the entire 11N market. China owns ~93% of all polysilicon capacity but, per ITIF and SIA, is “not yet” able to dominate semiconductor grade; closing that gap is an explicit Beijing goal and the key strategic risk [1][8]. Moat: qualification cycles measured in years, energy-cost geography, and process IP. EU/seed-relevant: Wacker (Burghausen) is the European champion and a strategic asset; there is little seed-stage opportunity in making EGS itself (capital-brutal, qualification-gated), the more fundable adjacencies are FBR/silane cost innovation and precursor/graphite consumables.

Market drivers, constraints & trends

Net read: the EGS served pool grows steadily on AI-driven wafer demand, but the trajectory is hostage to the solar cycle that funds the scale, and any re-rate is policy- and shortage-driven rather than volume-driven.

• Drivers

• Wafer demand is the pull: SEMI reports Q1 2026 silicon-wafer shipments up 13% year-on-year, with AI data centres taking the lion’s share and a new shipment record expected by 2028 [10]. Every extra leading-edge wafer needs 11N feedstock, and report-mills already put 2026 semiconductor polysilicon uptake up ~10% [11].

• Sovereignty/reshoring is opening captive demand: Hemlock secured a ~$325M CHIPS grant for new Michigan EGS capacity (~2026) and the Jan 2026 US-Taiwan reshoring deal pulls more leading-edge fab build onshore, lengthening the qualified-feedstock queue [12][13].

• Pricing resilience at the top: Wacker reports its hyperpure semiconductor-grade business performing very well with rising volumes into 2026 even as solar prices stay crushed, confirming EGS sits out the price war [14].

• Constraints

• The scale trap: domestic EGS economics depend on high-volume solar-grade output to hit the utilisation that makes 11N affordable; the solar glut and China’s ~93% capacity share threaten that base [13][8].

• Capex and qualification gate growth: new EGS lines cost billions and qualification runs years, so supply cannot flex to a demand spike, risking price volatility not volume [11].

• Cyclicality overshoot: Bernreuter warns the solar shakeout could overcorrect into a polysilicon shortage by 2028, repeating 2018-20, which would whipsaw feedstock cost for EGS makers [15].

• Trends & inflections to watch

• Capacity-step from the West: Wacker commissioned its >€300M Etching Line Next at Burghausen, lifting top-grade EGS capacity by >50% [16]. Tripwire: a second Western +50%-class EGS line announced (Wacker, Hemlock, OCI) by end-2027 confirms the demand pull is structural.

• Section 232 re-rate: the US polysilicon Section 232 probe opened 1 July 2025 with a determination due by ~March 2026 [8][17]. Tripwire: a tariff or tariff-rate-quota on imported polysilicon issued in 2026 would re-rate non-Chinese EGS supply security overnight.

• Shortage flip: Tripwire: Chinese polysilicon spot rising back above ~$10/kg (from ~$4.50/kg end-2024) signals the 2028 shortage thesis arriving early and pricing power returning to qualified producers [15].

Connections

Materials & Process

• Owning idea: Sovereign Electronics Manufacturing (China-dependence / sovereignty lens).

Sources

1. EnergyTrend / industry demand, semiconductor-grade ~33,500 MT, 2.4% of demand (2025) — https://www.energytrend.com/news/20241009-48523.html
2. Mordor Intelligence, Polysilicon Market, Siemens ~66% share, FBR CAGR — https://www.mordorintelligence.com/industry-reports/polysilicon-market
3. TaiyangNews / capacity ~2.26M MT, China ~93% (2023) — https://taiyangnews.info/business/china-dominates-2024-global-polysilicon-production
4. GMInsights, Trichlorosilane Market (~$7B 2025, polysilicon ~43%); SGL Carbon graphite — https://www.gminsights.com/industry-analysis/trichlorosilane-market
5. TaiyangNews Polysilicon CVD Reactors market survey (AMS, SST, Dynatec) — https://images.assettype.com/taiyangnews/2024-08-21/30tnntp6/TaiyangNews_Market_Survey_Polysilicon_CVD_Reactors_2017.pdf
6. Bernreuter Research, polysilicon manufacturers ranking + 11N/12N purity — https://www.bernreuter.com/polysilicon/manufacturers/
7. ITIF, China Plans to Dominate a Key Semiconductor Material (prices $24/kg fair, ~$5/kg China; solar 95%+) — https://itif.org/publications/2025/09/08/china-plans-to-dominate-a-key-semiconductor-material/
8. SIA, Polysilicon Section 232 Investigation comments (Aug 2025) — https://www.semiconductors.org/wp-content/uploads/2025/08/Semiconductor-Industry-Association-SIA-Comments-Polysilicon-Section-232-Investigation.pdf
9. Verified Market / report-mill EGS value range $10.5B (flagged as overstated) — https://www.verifiedmarketreports.com/product/electronic-grade-polysilicon-market-size-and-forecast/
10. SEMI, Q1 2026 silicon-wafer shipments +13% YoY, AI data centres lead, record by 2028 — https://www.semi.org/en/semi-press-release/semi-reports-worldwide-silicon-wafer-shipments-increase-13-percent-year-on-year-in-q1-2026
11. Verified Market / intel report-mill, 2026 semiconductor polysilicon uptake ~10%, capex/qualification barriers — https://www.intelmarketresearch.com/semiconductor-grade-silicon-market-9591
12. Hemlock Semiconductor, ~$325M CHIPS grant, Michigan EGS expansion ~2026 — https://www.hscpoly.com/biden-harris-administration-announces-preliminary-terms-with-hemlock-semiconductor-to-significantly-expand-u-s-production-capacity-of-semiconductor-grade-polysilicon-2/
13. Global Policy Watch, Jan 2026 US-Taiwan reshoring deal + semiconductor policy push — https://www.globalpolicywatch.com/2026/02/a-month-in-semiconductor-policy-section-232-measures-bis-rule-and-taiwan-deal-signal-strategic-push/
14. Wacker Chemie FY2025 / 2026 outlook, semiconductor-grade business strong, rising volumes — https://www.wacker.com/cms/media/en/documents/pressrelease-pdf/pm2026/wacker_fy2025.pdf
15. pv magazine / Bernreuter Research, polysilicon glut may reverse into shortage by 2028 — https://www.pv-magazine.com/2025/06/24/polysilicon-glut-may-reverse-into-shortage-by-2028-says-bernreuter-research/
16. Evertiq, Wacker commissions >€300M Etching Line Next, +50% top-grade EGS capacity (Jul 2025) — https://evertiq.com/news/2025-07-22-wacker-commissions-300m-production-line-for-chip-grade-polysilicon
17. Sandler Travis & Rosenberg, Section 232 polysilicon investigation timeline (opened 1 Jul 2025) — https://www.strtrade.com/trade-news-resources/tariff-actions-resources/section-232-investigation-polysilicon