Beyond the Leading Edge: The Overlooked Opportunity in Mature-Node Decarbonization

The conversation around semiconductor sustainability is frequently dominated by the most advanced technologies. AI logic, high-bandwidth memory (HBM), and leading-edge lithography capture the headlines, and for good reason. They are electricity-intensive, technically complex, and represent the fastest-growing segment of capital expenditure.

However, this laser focus on the leading edge can obscure a foundational truth about the industry: a massive installed base of mature-node production remains the backbone of the global economy. Supporting everything from automotive systems and power management to industrial sensors and consumer electronics, these processes are not going anywhere.

According to the TechInsights Global Semiconductor Carbon Emissions Forecast (2026-2030), fabrication emissions are projected to climb from approximately 190 million MT CO₂e in 2026 to 247 million MT CO₂e by 2030. While per-wafer intensity is lower for legacy nodes, their sheer volume means they remain a material, long-lived contributor to the industry's total carbon footprint.

Figure 1 – Nodes larger than 26nm are projected to represent nearly 40% of all silicon shipments through 2030 (Source: TechInsights)

Why Mature Nodes Matter

It is a common misconception that mature nodes are an "obsolete tail" of the industry. In reality, nodes larger than 26nm are projected to represent nearly 40% of all silicon shipments through 2030, accounting for roughly one-third of total fabrication emissions.

For many applications—such as analog, radio frequency, and mixed-signal products—advancing to a smaller node is not just unnecessary; it is often technically counterproductive. These products require specific device structures, high-voltage handling, and long-term reliability that are best served by established process technologies. Consequently, the industry’s decarbonization strategy cannot rely solely on migrating products to newer nodes. Instead, it must address the persistent, essential emissions base of mature-node manufacturing.

A Two-Pronged Decarbonization Strategy

The goal of sustainable chip manufacturing is not to replace mature nodes, but to optimize them. Our analysis indicates that emissions profiles for these nodes vary significantly based on fab location and product type. Some fabs are driven primarily by Scope 2 electricity demand, while others are dominated by Scope 1 process gas emissions or Scope 3 materials.

Because of this variance, a "one-size-fits-all" approach to semiconductor sustainability will fail. Practitioners must shift toward an installed-base optimization model, focusing on targeted levers:

• Electricity Procurement: Transitioning to renewable energy sources remains a primary lever for electricity-intensive fab routes.
• Abatement Performance: Upgrading abatement systems is critical for fabs where process gases contribute a material share of the carbon footprint.
• Efficiency and Yield: Reducing rework and improving overall equipment effectiveness (OEE) directly lowers the energy intensity required per good die.

The Path Forward: Data-Driven Transparency

The commercial reality is that customers are increasingly demanding verified Product Carbon Footprint (PCF) data. Suppliers who can document lower emissions for their specific fab route, electricity mix, and packaging flow—without forcing a node migration—gain a significant competitive advantage.

By quantifying emissions at the die and wafer levels, companies can move beyond generic industry averages. A practical roadmap starts with identifying high-volume products where targeted interventions yield the greatest impact. Suppliers that lead with this level of transparency are better positioned to compete not just on price and qualification, but on verifiable carbon performance.

Ultimately, mature-node decarbonization is about operational excellence. By integrating sustainability into the core of mature-node manufacturing, the industry can realize meaningful reductions in its carbon trajectory while maintaining the supply stability required for the modern world.