China turns to older DUV technology for 3nm chips

Summary

Researchers at the Chinese Academy of Sciences demonstrated an early-stage process for producing gate-all-around (GAA) transistors at sub-3 nm levels using DUV lithography. This work offers a potential alternative to China's blocked access to ASML's EUV machines. Based on statements from a single experienced researcher via Digitimes, the study is explicitly in a pre-production stage and has not been validated at the wafer scale.

Why it matters

If China can achieve sub-3 nm performance using DUV tools, it would weaken the strategic impact of EUV export restrictions that underpin US and Dutch semiconductor policy. Even at the research stage, this signal is significant: it shows Chinese labs are matching new transistor architectures (GAA) with older lithography technologies to close the node gap. This adds to a portfolio of parallel alternative solutions, including Huawei's 'Tau Scaling Law' design approach.

Highlights

• The GAA-on-DUV work is explicitly early-stage; no wafer-level validation or commercial-scale demonstration has been provided.
• Samsung is already using 3 nm GAA in mass production, and TSMC is transitioning to GAA at 2 nm in 2025. The architectural target is well understood; however, the DUV process path remains an unproven variable.
• Huawei's 2026 'Tau Scaling Law' (time-scaling design) is a separate design-level strategy claiming 1.4 nm-equivalent density by 2031; it is not a lithography breakthrough.

Critical take

The article relies on statements from a single researcher relayed via Digitimes; there are no peer-reviewed papers, yield data, or references to independent reproducibility. Describing this work as a 'path to advanced chip manufacturing' risks turning laboratory curiosity into a near-term competitive threat. The warning that the process is 'early-stage' and 'not ready for production' is lost beneath headlines framing it as a meaningful alternative. This framing serves geopolitical narrative more than engineering reality.