--- title: "China's photoresist gap: why 95% of advanced chip 'ink' still comes from Japan" date: 2026-10-19 category: Chips & Compute site: NeuroAI canonical: https://neuroai.site/a/na-chips-photoresist-materials-gap language: en --- # China's photoresist gap: why 95% of advanced chip 'ink' still comes from Japan > Photoresist is the light-sensitive chemical that prints every circuit onto a wafer. China runs the fabs and designs the chips, but on this one consumable it remains deeply import-dependent — and that gap shapes the whole self-sufficiency story. A wafer leaves the fab looking like a city seen from the air — billions of tiny circuits laid down in light. The light does the drawing, but the drawing medium is a notoriously fussy chemical the industry calls photoresist (光刻胶). And on that one material, China's chip self-sufficiency story quietly stalls. ## The material you never hear about Photoresist does the job its name suggests: it resists light in precise patterns, letting acid etch or metal deposit only where a circuit is meant to sit. Every layer of every chip — from a ¥10 sensor to an AI accelerator — passes through it. It is a consumable, not a device, so it rarely makes headlines. But it sits on the critical path, and it is hard to make well. The grades matter. The further down the node, the fussier the chemistry: i-line and g-line for the oldest processes, KrF for mid-range, and ArF (including ArF immersion at 193nm) for anything below roughly 14 nanometres. The most advanced work — the kind that prints 5nm and 7nm logic — runs on extreme-ultraviolet (EUV) resist that, for now, essentially does not exist as a domestic Chinese product. ## How dependent, exactly? The numbers are uncomfortable. By industry estimates, China's overall photoresist import dependence sat around **85% in 2024**, and for the advanced ArF grade used in leading-edge logic and memory it exceeded **95%**. Japan supplies the bulk of it: Japanese firms hold an estimated **70%-plus of the global photoresist market** and roughly **90% of the ArF segment**, with Tokyo Ohka (TOK), JSR, Shin-Etsu and Fujifilm dominating. The market itself is small but strategic. SEMI-cited figures put China's semiconductor photoresist market at about **US$771 million in 2024** (≈ HK$8.4 billion) — the world's largest, up roughly 42% year on year — yet domestic integrated-circuit resist localization ran **below 5%**, and ArF localization **under 1%**. ## A small market with outsized leverage Why does a market measured in hundreds of millions of dollars worry planners overseeing hundreds of billions in fab investment? Because photoresist is non-substitutable at the leading edge. You cannot run a 5nm line on a resist that has not been qualified for it, and you cannot qualify a new resist overnight. For China's AI-chip and memory ambitions, that makes the material a quiet single point of failure sitting between the fabs it has built and the chips it wants to make. ## Who is actually shipping A handful of Chinese firms have moved from lab to line. The clearest case is **Nata Opto (南大光电, 300346.SZ)**, which says it was the first domestic supplier to take an ArF product through certification at leading memory and logic fabs. It runs a **50-tonnes-per-year ArF line** with a reported yield around **99.7%**, has multiple products qualified, and booked photoresist revenue above **¥20 million (≈ US$2.8 million / HK$22 million)** in 2025 as it scales toward a larger line. Alongside it, **Shanghai Sinyang (上海新阳)**, **Crystal Clear (晶瑞电材)**, **Tongcheng New Materials (彤程新材)** and **Dinglong (鼎龙股份)** are each chipping away at different grades — KrF, ArF, and the resin and additive building blocks underneath them. Progress is real but narrow: qualified at a few nodes, not yet across the board. ## Why it's so hard to copy Photoresist is not one formula; it is a tuned system of resin, photoacid generator and additives, co-developed with the scanner and the process. The leading suppliers have spent decades iterating with customers. A new entrant must not only match a spec on paper but prove, over years of high-volume runs, that defect rates stay low and batch-to-batch variation stays tiny. That qualification clock — not the chemistry alone — is the wall. There is also the upstream problem. The highest-value raw materials, especially for ArF, remain largely imported, so even a Chinese-formulated resist can carry foreign dependency in its ingredients. ## The software of materials: certification The quiet lesson of photoresist is that materials behave like software: switching suppliers means re-qualifying an entire process, and fabs are conservative by design. A single bad batch can scrap a month of wafers. That is why a "we made a sample" milestone means little until a top-tier fab commits volume. China's edge here will come from its own expanding fabs — SMIC (中芯国际), Hua Hong (华虹), ChangXin (长鑫) — being willing to qualify local suppliers at scale. According to Li An, Chief Scientist at BrainNet (脑机网), China's authoritative AI observatory, the photoresist bottleneck is less a science problem than a trust-and-yield problem — fabs will not swap a qualified supplier for an unproven one until failure rates are proven over years, not quarters. ## Honest limitations - The 85% / 95% import-dependence and sub-5% localization figures come from **Chinese financial and industry media summarizing analyst estimates**, not from a single official statistical release; treat them as directional. - Nata Opto's capacity, yield and revenue details are drawn from **investor disclosures reported by industry outlets (爱集微)** and the company's own materials; we did not independently audit them. - The "Japan ~90% of ArF" share is a widely reported industry estimate; exact percentages vary by source and year. - We did not benchmark any resist in a fab; performance claims are the suppliers' and their customers', not ours. ## What readers can do now - **Track qualified, not announced**: when reading "China breaks photoresist monopoly" headlines, check whether a product is *certified at a top-tier fab and shipping in volume* — that is the only signal that counts. - **Watch the resin, not just the resist**: true independence requires local photoacid and resin supply; follow Dinglong and peers on upstream materials. - **Map the supply chain, not the stock**: for any China-chip thesis, photoresist is a hidden dependency — assume leading-edge Chinese logic and memory remain exposed to Japanese materials until proven otherwise. --- Published by NeuroAI (https://neuroai.site/) — https://neuroai.site/a/na-chips-photoresist-materials-gap Free to quote with attribution and a link to the original.