Tiny Device, Massive Leap: Japanese Scientists Develop Groundbreaking Silicon-Free Transistors

Transistors are widely regarded as one of the greatest technological inventions of the 20th century. They play a critical role in modern electronics by amplifying or switching electrical signals. However, as electronic devices continue to shrink, silicon-based transistors are approaching their physical and performance limits. To overcome this, researchers have begun exploring alternative materials and designs.

The Research Initiative

A team of researchers from the Institute of Industrial Science at The University of Tokyo led a project aimed at developing a new type of transistor. Their study, presented at the 2025 Symposium on VLSI Technology and Circuits, proposes an advanced transistor design using gallium-doped indium oxide (InGaOx) instead of conventional silicon.

Material Advantages

The researchers selected InGaOx for its ability to form a crystalline oxide structure, which provides a highly ordered crystal lattice ideal for efficient electron mobility. Additionally, the material's electrical characteristics can be improved by doping it with gallium, which helps to reduce oxygen-vacancy defects that typically reduce the stability of indium oxide.

Design Innovation: Gate-All-Around Architecture

The team incorporated a gate-all-around (GAA) structure in their transistor design. In this architecture, the gate surrounds the entire channel where the current flows. According to lead author Anlan Chen, this structure offers enhanced efficiency and scalability compared to traditional transistor gate layouts.

Fabrication Method

Using atomic-layer deposition, the researchers applied a thin film of InGaOx to the channel region, one atomic layer at a time. The film was then heat-treated to form the desired crystalline structure, crucial for achieving high electron mobility. This process enabled the creation of a metal oxide-based field-effect transistor (MOSFET) with advanced characteristics.

Performance and Reliability

The newly developed GAA-MOSFET demonstrated an electron mobility of 44.5 cm²/Vs, a significant improvement over comparable devices. It also showed excellent reliability, operating stably under applied stress for nearly three hours. According to the research team, the device outperformed previously reported similar transistors in both performance and durability.

Implications for the Future

This breakthrough highlights the importance of integrating innovative materials with advanced structural designs. The successful development of this transistor brings the industry closer to producing high-density, reliable components suitable for demanding computational applications such as artificial intelligence and big data processing. These next-generation transistors have the potential to significantly enhance the performance of future electronic systems.

Source: www.eurekalert.org