Tokyo Researchers Build 1‑nm Semiconductor Nanotubes, Paving Way for Atom‑Scale Chips

Why It Matters

The ability to fabricate one‑nanometer semiconductor channels directly addresses the physical limits of silicon lithography, where patterning errors and defect rates rise sharply below 7 nm. By eliminating etching‑induced damage, the nanotube approach could sustain transistor scaling for another decade, preserving performance gains while curbing power consumption. Moreover, the technique’s compatibility with a variety of functional materials opens pathways to heterogeneous integration—combining logic, memory, and sensing on a single atomic‑scale platform. Beyond pure performance, the breakthrough could reshape supply chains. Current advanced nodes rely on a handful of EUV lithography suppliers and a complex ecosystem of photo‑mask makers. A bottom‑up, self‑assembly route that uses chemical vapor deposition and selective etching could lower capital expenditures for fabs, democratizing access to ultra‑dense chips for smaller players and emerging markets.

Key Takeaways

• University of Tokyo researchers fabricated 1 nm MoS₂ semiconductor nanotubes, 100,000× thinner than human hair.
• The tubes were created using a boron‑nitride nanotube mold, then removed after heating—a matryoshka‑style process.
• Atomic‑level precision eliminates defects common in silicon etching at sub‑10 nm scales.
• Potential to replace fin‑type channels in gate‑all‑around transistors, boosting density beyond current 5‑nm nodes.
• Future work aims to extend tube length to ≥1 µm and explore magnetic or superconducting materials for integrated functions.

Pulse Analysis

The Tokyo breakthrough arrives at a moment when the semiconductor industry is scrambling for a post‑silicon scaling strategy. Intel, TSMC, and Samsung have all announced roadmaps that lean heavily on 3‑D stacking, advanced packaging, and new channel materials like germanium or III‑V compounds. Those approaches still depend on top‑down lithography, which is approaching its economic and physical limits. A bottom‑up method that builds the transistor channel atom by atom sidesteps many of those constraints, but it also introduces new challenges: uniformity across 300‑mm wafers, integration with existing interconnect layers, and reliable doping of the ultra‑thin channel.

Historically, nanowire and nanotube research has been hampered by reproducibility and scalability. Carbon nanotubes, for example, showed promise for high‑mobility channels but suffered from mixed metallic/semiconducting behavior and difficulty aligning them en masse. The MoS₂ tubes described here benefit from a well‑understood semiconductor bandgap and the insulating BN mold that guarantees structural integrity during growth. If the University of Tokyo team can demonstrate wafer‑scale uniformity, they could leapfrog the current bottleneck and give chipmakers a viable alternative to EUV lithography upgrades, which cost billions of dollars.

From a market perspective, the technology could trigger a wave of venture capital into nanomaterial fabs and equipment suppliers specializing in atomic‑layer deposition and precision etching. Governments may also view the method as a strategic asset, potentially funding pilot lines to keep domestic semiconductor capabilities competitive. However, the path from laboratory to fab is long; even if the nanotubes reach 1 µm length, integrating them into a full transistor stack will require new design‑for‑manufacturing (DFM) rules and testing standards. The next 12‑18 months will be critical as the researchers publish detailed electrical data and partner with industry to validate the process at scale.