Strange Material Gets Better at Conducting Electricity The Thinner It Gets
Could this supercharge semiconductor performance?
Researchers have identified a promising alternative to copper for semiconductor interconnects, the microscopic wiring that carries electrical signals within computer chips. A team of physicists has demonstrated that cobalt silicide, a nanoscale material combining cobalt and silicon, exhibits superior electrical properties compared to traditional copper, particularly at smaller scales.
The discovery addresses a significant challenge in modern electronics. As copper interconnects shrink to accommodate denser chips, electrons scatter off wire surfaces, increasing resistance and slowing data transfer. Cobalt silicide exhibits counterintuitive behavior—its electrical resistance actually decreases as the material becomes thinner. When researchers reduced cobalt silicide thickness from one micrometer to 20 nanometers, electrical resistivity dropped tenfold, and current-carrying capacity exceeded copper by roughly 100 times at room temperature.
Practical testing validated the material’s potential for real-world applications. Signal transmission experiments showed cobalt silicide interconnects could operate reliably at frequencies up to 40 gigahertz, while integration tests with silicon ring oscillators demonstrated compatibility with existing chip manufacturing platforms. The material also proved durable, maintaining stability at temperatures reaching 450 degrees Celsius for extended periods.
The findings, published in Nature Materials, suggest cobalt silicide could overcome a growing bottleneck in semiconductor performance. As transistors continue advancing in speed, interconnect limitations increasingly constrain overall chip efficiency. This material breakthrough may enable electronics manufacturers to develop faster, more reliable devices while reducing the substantial costs associated with interconnect production.
Originally reported by Sciencealert →
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