University of Tokyo Creates 1‑nm Semiconducting Nanotubes, Paving Way for Ultra‑small Transistors

Why It Matters

The ability to fabricate semiconducting nanotubes at a true atomic scale resolves a long‑standing materials challenge that has limited the miniaturization of transistors. By delivering a predictable bandgap and an intrinsic insulating sheath, the MoS₂/BN system could replace silicon in the most demanding low‑power, high‑density applications, extending Moore’s Law beyond its projected end‑point. Beyond logic devices, the uniform 1‑nm channels are attractive for high‑resolution sensors and quantum‑scale research, where precise control over electronic states is essential. The breakthrough therefore has the potential to spawn new product categories ranging from ultra‑compact processors to nanoscale photonic components.

Key Takeaways

• University of Tokyo team synthesizes 1‑nm single‑walled MoS₂ nanotubes inside BN shells.
• Coaxial structure provides built‑in insulation, ideal for gate‑all‑around transistors.
• Bandgap reduction with decreasing diameter matches predictions made over 25 years ago.
• Potential to shrink transistor footprints by up to 30 % and lower power consumption.
• Next steps include electrical testing of individual nanotubes and scaling to wafer‑level production.

Pulse Analysis

The Tokyo breakthrough arrives at a moment when the semiconductor industry is scrambling for alternatives to silicon as physical limits loom. While silicon finFETs have delivered incremental gains, their scaling trajectory is flattening due to short‑channel effects and leakage currents. The MoS₂/BN nanotube offers a fundamentally different approach: a one‑dimensional channel with an atomically thin, high‑k dielectric already integrated. This could bypass the complex multi‑layer stack that modern 3‑nm processes require, simplifying manufacturing and reducing defect density.

Historically, carbon nanotubes were touted as the successor to silicon, but variability in electronic properties and difficulties in large‑scale alignment stalled commercial adoption. Inorganic nanotubes, especially those based on transition‑metal dichalcogenides like MoS₂, have been explored in labs but never achieved the uniformity needed for device integration. The Tokyo team's use of a BN template to enforce structural precision is a clever engineering solution that may finally bridge the gap between laboratory curiosity and manufacturable technology.

If the team can demonstrate reliable transistor operation and develop a compatible deposition process, major foundries could incorporate the material into existing fab lines with modest retrofits. This would give early adopters a competitive edge in markets where power efficiency and form factor are paramount, such as wearables, IoT edge nodes, and autonomous sensors. However, the path to volume production will hinge on yield, cost of BN templates, and the ability to integrate with current lithography workflows. Investors and device designers should monitor upcoming prototype demonstrations, as they will signal whether the technology can move from a scientific milestone to a commercial catalyst.