Extreme Ultraviolet (EUV) lithography is the most advanced chipmaking technology in the world. It uses light with a wavelength of just 13.5 nanometers to print the tiniest features on silicon wafers, enabling chips with billions of transistors in an area smaller than your fingernail.
Key Fact
A single EUV machine costs over $200 million, weighs 180 tons, and is only manufactured by one company: ASML of the Netherlands.
How Does EUV Lithography Work?
Traditional photolithography uses deep ultraviolet (DUV) light at 193nm wavelength. As transistors shrunk below 7nm, this wavelength became too large to print fine details directly. EUV solves this by using light with a wavelength of 13.5nm—about 14x shorter.
The Light Source
Creating EUV light is incredibly complex:
- Tin droplets (50,000 per second) are fired into a vacuum chamber
- A high-power CO2 laser hits each droplet twice
- The tin vaporizes into plasma at 500,000°C
- This plasma emits EUV photons at 13.5nm
The Optical System
EUV light is absorbed by almost everything, including air and glass. Therefore:
- The entire system operates in a near-perfect vacuum
- Instead of lenses, mirrors with multilayer coatings reflect the light
- Each mirror reflects only 70% of light, so multiple mirrors compound losses
- Only about 2% of generated EUV light reaches the wafer
Why is EUV So Important?
| Process Node | Lithography | Transistors per mm² |
|---|---|---|
| 7nm (2018) | DUV + EUV (limited) | ~100 million |
| 5nm (2020) | EUV | ~170 million |
| 3nm (2022) | EUV (more layers) | ~290 million |
| 2nm (2025) | High-NA EUV | ~500 million |
Without EUV, chipmakers would need multiple patterning—exposing the wafer 3-4 times with DUV to achieve the same resolution. This is slower, more expensive, and introduces alignment errors.
ASML: The Only EUV Manufacturer
ASML Holding (Netherlands) is the sole producer of EUV lithography machines. This monopoly exists because:
- 20+ years of R&D with over $10 billion invested
- Collaboration with Zeiss (optics), Trumpf (lasers), and IMEC (research)
- No competitor has successfully replicated the technology
- Each machine has 100,000+ components from 5,000 suppliers
Machine Specs: ASML NXE:3600D
- Throughput: 160 wafers/hour
- Resolution: Sub-20nm features
- Power consumption: 1.2 MW
- Weight: 180 tons
- Price: $200+ million
Who Uses EUV?
Only three companies have EUV capability:
1. TSMC (Taiwan)
The world leader, manufacturing chips for Apple, NVIDIA, AMD, and Qualcomm. Uses EUV extensively for 5nm, 3nm, and upcoming 2nm nodes.
2. Samsung (South Korea)
Second-largest foundry, also uses EUV for advanced nodes. Manufactures for Qualcomm and its own products.
3. Intel (USA)
Uses EUV for Intel 4 (7nm-class) and Intel 3. Ramping up with High-NA EUV for Intel 18A (1.8nm-class) in 2025.
High-NA EUV: The Next Generation
The newest evolution is High-NA EUV with a numerical aperture of 0.55 (vs 0.33 for current EUV). This enables:
- 8nm resolution (vs 13nm for standard EUV)
- 2nm and below process nodes
- Cost: $380 million per machine
Intel received the first High-NA EUV machine in late 2023 for R&D. TSMC and Samsung are following.
Geopolitical Implications
EUV has become a geopolitical flashpoint:
- The US, Netherlands, and Japan have banned EUV exports to China
- China cannot manufacture advanced chips (sub-7nm) without EUV
- SMIC (China) is limited to DUV, producing 7nm with multi-patterning
- This technology gap is a major element of US-China tensions
Key Takeaways
- EUV uses 13.5nm wavelength light to print sub-20nm chip features
- ASML is the only manufacturer—a $300B+ company
- EUV enables 5nm, 3nm, and 2nm chips
- High-NA EUV is the next evolution for 2nm and beyond
- Geopolitical restrictions limit China's access to this technology
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