A Transparent Foundation: How Glass is Transforming the Next Generation of AI Hardware

For many decades, the semiconductor industry has relied on organic materials like epoxy reinforced with fiberglass to serve as the foundation, or substrate, for computer chips. However, as artificial intelligence applications demand more power and larger hardware configurations, these traditional materials are reaching their physical limits. High-performance chips generate extreme heat that can warp organic bases, leading to mechanical failures or misaligned parts. To solve this, major tech players are turning to a material thousands of years old: glass.

Glass offers superior thermal stability compared to modern plastics, meaning it stays flat even under the intense heat of AI workloads. This rigidity allows engineers to pack components much more tightly. Experts at Intel suggest that glass could support ten times the connection density of current substrates, enabling a 50% increase in the number of silicon chips that can fit within a single package. Beyond physical space, glass is incredibly smooth, which helps eliminate manufacturing defects at the microscopic level. It also opens the door to optical data transmission, where light signals replace energy-heavy copper wires, potentially making future data centers far more energy-efficient.

The transition to glass is already well underway. In the United States, a company called Absolics recently completed a specialized factory in Georgia and aims to begin commercial production this year. This effort is supported by significant government funding through the CHIPS for America program. While Absolics leads in early production, industry titans like Intel, Samsung, and LG are accelerating their own research. Intel has already demonstrated the viability of the technology by successfully booting the Windows operating system on a test device featuring a glass core.

Despite these advantages, glass presents unique manufacturing hurdles because of its fragility. Handling panels as thin as 700 micrometers requires specialized tools to prevent cracking. However, as the ecosystem of suppliers expands across South Korea, China, and the U.S., the market for glass substrates is projected to grow from $1 billion in 2025 to over $4 billion by the mid-2030s. While initial use will be concentrated in massive AI data centers, the technology could eventually scale down to make personal laptops and smartphones faster and more efficient.

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Read original at MIT Technology Review Computing.