TSMC Just Solved a Major Problem With Atomic-Scale Transistors

TSMC and researchers from National Yang Ming Chiao Tung University have demonstrated a new way to build high-performance transistors using an atomically thin semiconductor channel. The device uses monolayer molybdenum disulfide, or MoS₂, a two-dimensional semiconductor only around 0.7 nanometers thick. Materials this thin are promising because they allow the transistor gate to maintain strong electrical control even as conventional silicon devices become increasingly difficult to scale. But one major problem has remained: integrating an extremely thin gate dielectric without damaging carrier transport. The research team solved this by redesigning the interface itself. They first deposited an ultrathin epitaxial aluminum layer directly onto the MoS₂ surface under ultrahigh-vacuum conditions. The aluminum was then oxidized to form an approximately 0.42-nanometer aluminum oxide layer. A high-k hafnium oxide dielectric was deposited on top. This atomic-scale buffer gives the HfO₂ layer a much better surface to grow on while reducing unwanted scattering at the semiconductor-dielectric interface. The resulting top-gate transistor achieved an equivalent oxide thickness of around 1 nanometer while reaching peak transconductance of approximately 0.45 mS/µm. The researchers also reported extremely low leakage current and stable operation. That combination is difficult to achieve in two-dimensional transistors. Normally, reducing the gate dielectric thickness improves electrostatic control but increases scattering and hurts carrier mobility. This new interface engineering approach helps preserve both a thin gate stack and strong electrical performance. The research does not mean TSMC has already created a commercial “sub-1nm” manufacturing process. The demonstrated devices still used gate lengths of around 100 nanometers in the published experiments, and much more work is required before MoS₂ transistors can be integrated into high-volume processors. But the breakthrough addresses one of the key materials problems that must be solved if the semiconductor industry eventually moves beyond conventional silicon channels. As FinFET and GAAFET scaling becomes increasingly difficult, atomically thin materials such as MoS₂ could offer another path toward smaller, faster and more energy-efficient transistors. Could the next generation of chips move beyond silicon completely? Subscribe to Xenon Lab News for more semiconductor, AI hardware and future technology breakthroughs. #TSMC #MoS2 #Semiconductors #Transistors #2DMaterials #Nanotechnology #ChipTechnology #FutureChips #MooresLaw #NYCU #AtomicScale #HfO2 #SemiconductorResearch #PostSilicon #ScienceNews #TechNews #XenonLabNews