China's Academy of Sciences has demonstrated a new pathway to manufacturing advanced semiconductors below the 3-nanometer threshold without access to cutting-edge extreme ultraviolet lithography equipment, marking a significant step in the country's effort to reduce dependence on restricted foreign technology. The breakthrough, announced this week, shows researchers can achieve sub-3-nm processing using older deep ultraviolet (DUV) lithography tools, even as US sanctions continue to block access to the most advanced equipment from Dutch manufacturer ASML.

Why Is China Pursuing This Alternative Chip Path?

The United States has imposed strict export controls on ASML's extreme ultraviolet lithography machines, which are considered essential for producing chips smaller than 7 nanometers. These restrictions aim to limit China's ability to manufacture the most advanced semiconductors used in artificial intelligence, military applications, and consumer electronics. By developing an alternative manufacturing route using older DUV technology, China is attempting to chart an independent course in semiconductor production despite these geopolitical constraints.

The significance of this development lies not in immediate mass production capability, but rather in demonstrating that advanced chip nodes may be achievable through different technological approaches. Researchers at China's Institute of Microelectronics have completed early integration work on what they call a "new early-stage MOS transistor process path for China's sub-3-nm advanced manufacturing," according to statements made during recent industry presentations.

What Technical Approach Did Researchers Use?

The Chinese Academy of Sciences team focused on developing gate-all-around (GAA) transistor technology using deep ultraviolet lithography. Gate-all-around transistors represent an advanced transistor design where the gate electrode surrounds the channel on all sides, allowing for better control of electrical current and improved performance at smaller scales. By using this design approach with older DUV tools rather than waiting for access to newer EUV equipment, researchers found a workaround to the technology bottleneck.

The team specifically worked on stacked nanosheet-channel GAA CMOS transistors, completing what they describe as early integration phases. While this represents preliminary progress rather than production-ready manufacturing, it demonstrates that the theoretical pathway exists for achieving sub-3-nm performance through alternative means.

How to Understand the Implications of This Breakthrough

• Timeline Reality: The breakthrough remains in early stages and is far from mass production capability, meaning commercial chips using this technology are likely years away from market availability.
• Geopolitical Significance: The development suggests China may reduce its vulnerability to US export controls by developing indigenous alternatives, potentially reshaping global semiconductor supply chains over the long term.
• Technical Feasibility: Success with older lithography tools could inspire other countries and companies to explore alternative manufacturing pathways rather than relying exclusively on cutting-edge equipment from a single supplier.

The work was conducted by researchers at the Chinese Academy of Sciences' Institute of Microelectronics, with details shared publicly during industry presentations. The institute is state-backed, indicating this effort is part of China's broader national strategy to achieve semiconductor self-sufficiency.

While the announcement represents meaningful progress in chip design innovation, experts caution that translating laboratory achievements into reliable, cost-effective mass production involves substantial additional engineering work. The gap between demonstrating a new transistor design and manufacturing millions of chips at commercial scale remains significant, particularly when using equipment that was not originally designed for such advanced applications.

This development underscores the ongoing technology competition between the United States and China in semiconductor manufacturing. As US restrictions tighten, Chinese researchers are investing heavily in alternative approaches that could eventually reduce the effectiveness of export controls. The outcome of these efforts will likely influence global semiconductor strategy, supply chain diversification, and international technology policy for years to come.