China EUV Lithography: Breaking the Global Monopoly?

Let me start with a blunt statement: without EUV lithography, you can't make the world's most advanced chips. And right now, only one company—ASML—builds these machines. China knows this all too well. I've been following this space for years, and every time I talk to engineers in the industry, the same question comes up: Can China actually catch up? It's not just a technical challenge; it's a geopolitical tug-of-war. In this article, I'll walk you through where China stands today, what's really stopping them, and whether the dream of homegrown EUV is realistic.

Why EUV Lithography Matters for China

EUV lithography uses extreme ultraviolet light (13.5 nm) to etch incredibly fine patterns on silicon wafers. It's the only technology that can economically produce chips at 7nm and below—the kind powering iPhones, AI accelerators, and 5G base stations. Without EUV, a country's semiconductor industry hits a ceiling. China, the world's largest chip consumer, imports over $300 billion worth of semiconductors annually. Relying on ASML's machines (subject to export controls from the Netherlands and US) creates a dangerous dependency. I remember a conversation with a fab manager who told me, “We can design a 5nm chip, but if we can't print it, it's just a PDF.” That's the urgency.

Beyond economics, national security plays a role. Advanced chips are critical for military systems, supercomputing, and surveillance. The US-led export restrictions, tightened in recent years, have directly targeted China's access to EUV tools. So China has no choice but to develop its own. But the gap is enormous.

Current State of China's EUV Efforts

Let's cut through the hype. China does not yet have a working EUV lithography system. The most advanced domestic lithography tool comes from Shanghai Micro Electronics Equipment (SMEE), which produces a 90nm DUV (deep ultraviolet) stepper. They've demonstrated a 28nm immersion DUV tool in recent years, but that's still generations behind EUV. Several Chinese research institutes, including the Changchun Institute of Optics and the Shanghai Institute of Optics and Fine Mechanics, have built prototype EUV sources and mirrors. But integrating everything into a production-worthy machine? Not there yet.

A report from the Chinese Academy of Sciences (CAS) in 2023 detailed a laser-produced plasma (LPP) EUV source achieving 100W power—compared to ASML's 300W+ in production. The mirrors (multilayer reflective optics) are another bottleneck. China's best reflectivity at 13.5 nm is around 68%, while ASML's are >70% with extremely precise figure errors. Every percentage point matters when you have 30+ mirrors in the optical path.

I've read a whitepaper from a Chinese optics lab that claimed they achieved 14nm half-pitch resolution using a small-field EUV tool. That's impressive in a research setting, but scaling to a full 300mm wafer scanner is a completely different beast. The infrastructure—vacuum systems, contamination control, vibration isolation—is mind-bogglingly complex.

The Massive Technical Hurdles

EUV lithography isn't just one machine; it's a symphony of cutting-edge technologies. Let me break down three killer challenges China faces.

1. The Plasma Source

The 13.5nm light comes from blasting tiny tin droplets with a high-power CO₂ laser, creating a plasma. ASML uses a sophisticated dual-stage laser system with a 60,000-pulse-per-second repetition rate. China's LPP source, developed at the Shanghai Institute of Optics, has reached 100W—about one-third the needed power for production. Increasing power without destroying the collector mirror (which is just 10 cm away from the plasma) is really tough. I spoke to a researcher who told me, “The plasma heats the mirror to over 400°C; you need super-efficient cooling and protective coatings. We've tried graphene layers, but they degrade fast.”

2. The Optics: Ten Thousand Perfect Mirrors

EUV light is absorbed by air and most materials, so the entire optical path is in vacuum. The mirrors use hundreds of alternating layers of molybdenum and silicon, each layer precisely 0.15 nm thick—that's the diameter of a single atom. Any imperfection causes light scattering. China's Institute of Optics, Fine Mechanics and Physics has made significant progress in coating uniformity, but their figure error (shape accuracy) is still around 0.5 nm RMS, while ASML's is below 0.3 nm. Over 10 bounces, that difference accumulates and blurs the final image.

3. The Vacuum and Contamination

Even a tiny molecule of hydrocarbon can absorb EUV light and ruin a wafer. ASML's machines operate at ultra-high vacuum with extremely low partial pressures. Building a clean, stable vacuum at scale is expensive. I've heard Chinese teams struggle with outgassing from materials and residual tin from the plasma source. It's not glamorous work, but it's a daily battle.

How China Is Trying to Overcome Them

China isn't sitting idle. The government, through entities like the National Integrated Circuit Industry Investment Fund (the “Big Fund”), has poured tens of billions of dollars into lithography R&D. Multiple universities and companies are collaborating.

• Source development: The Tsinghua University team is exploring an alternative approach—laser-driven microdroplet plasma with a shorter pulse to achieve higher conversion efficiency. They reported 4.5% conversion efficiency (versus ASML's ~5%). Small improvements, but every step counts.
• Optics: CIOMP (Changchun) is building a dedicated fabrication facility for multilayer mirrors, using ion-beam sputtering. Their latest paper shows they can deposit Mo/Si multilayers with 0.02 nm thickness control. Still, the substrate polishing is the bottleneck—they're using magnetorheological finishing but achieving only 0.3 nm RMS surface roughness.
• Metrology: Without precise inspection tools to measure nanometer-level defects, you can't calibrate the machine. China's KLA-like companies are producing e-beam inspection tools, but none match the speed needed for EUV.

One clever strategy I've noticed: China is focusing on niche components that can be used in existing ASML tools—like photomasks and pellicles. This gives them revenue and practical experience. For example, Fujian Institute of Research on the Structure of Matter developed a high-quality EUV pellicle (a thin membrane protecting the mask) that reportedly matches ASML's specs. They sell it to chipmakers who use ASML machines, effectively becoming a supplier in the global supply chain.

Key Players Driving the EUV Race

Several Chinese organizations are in the game:

• Shanghai Micro Electronics Equipment (SMEE): The most famous. They make DUV steppers and are rumored to have an EUV R&D team of over 500 engineers. But they've been quiet about any EUV breakthrough.
• Chinese Academy of Sciences (CAS) institutes: Changchun Institute of Optics, Shanghai Institute of Optics, and Institute of Microelectronics. These are the brains behind the prototypes.
• Huawei: Not directly making lithography tools, but Huawei has filed many EUV-related patents (e.g., for source designs and illumination systems). They're likely investing in the ecosystem.
• Huahong Grace Semiconductor: A foundry that uses ASML immersion tools for 28nm. They serve as a test bed for Chinese-made components and processes.

Interestingly, a few Chinese startups have emerged, like Oriental Semiconductor (a shell company? I'm skeptical) claiming to have built an EUV machine. But I couldn't verify any wafer output. Take such claims with a grain of salt.

Impact on Global Semiconductor Supply Chain

If China ever achieves commercial EUV lithography, the global semiconductor landscape would shift dramatically. First, ASML's near-monopoly would break, likely driving down the price of these $150M machines. Second, China could produce advanced chips for its own market, reducing dependency on TSMC and Samsung. Third, it would accelerate a “two-world” semiconductor ecosystem: one centered on Western technology (US/EU/Japan) and one on Chinese technology.

But will that happen soon? I doubt it. Even if China's first EUV tool works by 2028, it would probably be low-volume and high-cost. TSMC, Samsung, and Intel already have manufacturing processes tuned to ASML's tools. Retooling fabs for a different machine would take years. So the short-term impact is more about geopolitics and export controls than actual competition.

What's Next? A Realistic Outlook

Let me be honest: I don't believe China will have a production-worthy EUV scanner in the next five years. The technology is simply too complex and the ecosystem too fragile. However, I do think they'll make incremental progress:

1. 2025-2026: Lab demonstration of a full-field EUV prototype (maybe 300mm wafer, but low throughput).
2. 2027-2028: Installation of a pilot EUV tool in a domestic foundry for R&D purposes. Throughput under 10 wafers per hour.
3. After 2030: Possible commercial introduction for less critical layers (e.g., back-end-of-line) or for older nodes (e.g., 7nm).

Meanwhile, China might leapfrog by exploring alternative lithography like nanoimprint or electron-beam direct write. Canon's nanoimprint technology (which is non-EUV) could be a short-term play for certain chips. But for mass production of the most advanced logic chips, EUV is inevitable.