Ruthenium: A key component in semiconductors

Ruthenium: A Key Component in Semiconductors

The Unsung Hero of Modern Electronics

In the relentless pursuit of smaller, faster, and more efficient electronics, one element is quietly revolutionizing the semiconductor industry: Ruthenium. While copper has long been the workhorse for interconnects in chips, its limitations are becoming increasingly apparent as technology advances. Ruthenium, a rare transition metal belonging to the platinum group, is emerging as a promising alternative, offering superior properties that could unlock the next generation of microelectronic devices. As of November 2025, Ruthenium trades at new all-time highs, up +72.58% year-to-date and nearly 100% above the 2024 level.

The Challenges of Copper Interconnects

For years, copper has been the go-to material for interconnects – the tiny wires that connect transistors within a chip. Its high conductivity and relatively low cost have made it an industry standard. However, as chipmakers strive to create smaller and more powerful devices, copper faces several challenges:

• Barrier Layers: Copper wires require barrier layers to prevent diffusion into surrounding materials, which takes up space and hinders miniaturization.
• Electromigration: As copper wires shrink, they become more susceptible to electromigration, a process where the flow of electrons causes the metal atoms to move, leading to wire degradation and failure.
• Increased Resistivity: The resistivity of copper increases as the wires become thinner, reducing the chip’s performance.

These limitations have prompted researchers to explore alternative materials that can overcome these challenges and enable further advancements in semiconductor technology.

Ruthenium: A Promising Alternative

Ruthenium offers a compelling solution to the challenges faced by copper interconnects. Metallic ruthenium films exhibit superior material properties when applied in wire diameters of a few nanometers or less. Here’s why ruthenium is gaining traction in the semiconductor industry:

• Resistance to Thermal and Electrical Degradation: Ruthenium improves the longevity of transistors.
• High Melting Point: Ruthenium allows for heat-prone applications.
• Potential to Create Barrierless Interconnects: Ruthenium allows for smaller device architectures and reduces the number of process steps.
• Low Resistivity: Ruthenium facilitates higher-performing chips with faster switching times.
• Corrosion Resistance: Ruthenium resists corrosion like few other metals and is also less susceptible to electromigration, the process that wears down chip materials over time.

These properties make ruthenium an ideal candidate for replacing copper in advanced interconnects, enabling the creation of smaller, faster, and more reliable chips.

Applications of Ruthenium in Semiconductor Manufacturing

Ruthenium is finding applications in various aspects of semiconductor manufacturing, including:

• Interconnects: Ruthenium can be used to create finer, thinner, and more conductive interconnects, improving chip performance. Simulations have shown that using ruthenium vias for the first four layers of the interconnect stack can reduce overall resistance by as much as 60%.
• Hard Masking: Ruthenium precursors can be used for hard masking, a technique used to pattern тонкие layers of material during chip fabrication.
• Diffusion Barrier Layers: Ruthenium can act as a diffusion barrier, preventing unwanted materials from contaminating the semiconductor device.
• Gate Electrodes: Ruthenium has received attention for next-generation gate electrodes.
• Memory Devices: Ruthenium is a key material for next-generation semiconductor memory known as spin-transfer torque magneto-resistive random-access memory (STT-MRAM).

Atomic Layer Deposition (ALD) of Ruthenium Thin Films

Atomic layer deposition (ALD) is a technique used to deposit thin films of materials with atomic-level precision. ALD is particularly well-suited for depositing ruthenium films due to its ability to create conformal and uniform coatings on complex structures.

Challenges and Opportunities

Despite its promising properties, ruthenium faces challenges that need to be addressed before it can be widely adopted in the semiconductor industry.

• Scarcity: Ruthenium is an extremely rare metal, representing only 0.0000002% of the Earth’s crust. Finding and extracting this metal in sufficient quantities to replace copper is not easy at all.
• Cost: The rarity of ruthenium translates to a higher cost compared to copper, which may limit its use in cost-sensitive applications.
• Supply Chain: Ruthenium is primarily obtained as a by-product of platinum mining, meaning its production is closely tied to the demand and supply dynamics of platinum. Geopolitical factors, such as political stability in major producing regions like Russia and South Africa, directly impact the global supply chain for ruthenium, further driving its value and market expansion.

Overcoming the Challenges

To overcome these challenges, researchers are exploring several strategies:

• Developing New Ruthenium Precursors: New precursors can improve the efficiency and cost-effectiveness of ruthenium deposition.
• Optimizing Deposition Processes: Optimizing deposition processes, such as ALD, can minimize material waste and reduce costs.
• Exploring Alternative Sources: Exploring alternative sources of ruthenium, such as recycling electronic waste, can help increase supply and reduce reliance on traditional mining.
• Alloying: Alloying ruthenium with other metals can enhance its properties and reduce the amount of ruthenium needed.

The Future of Ruthenium in Semiconductors

Despite the challenges, the future of ruthenium in semiconductors looks promising. As chipmakers continue to push the boundaries of miniaturization and performance, the unique properties of ruthenium will become increasingly valuable. With ongoing research and development efforts, ruthenium is poised to play a significant role in the next generation of microelectronic devices.

Market Dynamics and Price Trends

The global market for Ruthenium was estimated at US$5.1 Billion in 2023 and is projected to reach US$7.1 Billion by 2030, growing at a CAGR of 4.8% from 2023 to 2030. Several factors influence the price of ruthenium:

• Supply and Demand: The electronics, chemical, and renewable energy sectors play a significant role on the demand side. As technology advances and the push for sustainable solutions intensifies, the demand for ruthenium rises. On the supply side, challenges in mining, geopolitical tensions, and environmental concerns can impact the availability of ruthenium.
• Geopolitical Influences: Political instability in major producing regions can lead to significant price volatility.
• Market Sentiment: Buyer urgency and inventory restocking can also influence prices.

The Bottom Line

Ruthenium is emerging as a key component in semiconductors, offering superior properties that can overcome the limitations of copper interconnects. While challenges remain, ongoing research and development efforts are paving the way for wider adoption of ruthenium in advanced microelectronic devices. As technology continues to evolve, ruthenium is poised to play a crucial role in shaping the future of electronics.

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