A fundamental shift from organic and silicon materials to glass substrates is underway in semiconductor packaging, with a Western Securities report forecasting the market to approach $80 billion by 2028 as AI demand pushes current technology to its physical limits.
The explosive growth in AI computing is forcing a generational shift in semiconductor materials, with glass substrates poised to replace traditional organic materials in advanced packaging to accommodate more powerful chips. A May 17 report from Western Securities forecasts the global market for Through-Glass Via (TGV) technology will reach nearly $80 billion by 2028, capturing half of the advanced packaging market by 2030 as industry leaders Intel, Samsung, and TSMC integrate it into their core roadmaps.
"The industry is reaching a consensus to move from silicon to glass," the Western Securities report stated, granting the sector an "over-perform" rating. This transition addresses critical bottlenecks in high-performance computing, where the physical limitations of organic substrates—used for decades to house and connect chips—are now throttling the potential of AI accelerators and high-bandwidth memory (HBM).
The problem is physics. As chip packages grow larger to accommodate more processing power, the mismatch in thermal expansion between silicon chips and organic substrates causes warping and potential connection failures. Furthermore, organic materials' high electrical resistance, or dielectric loss, degrades high-speed signals, creating a vicious cycle of signal deterioration, increased power consumption, and excess heat. While TSMC's CoWoS technology, which uses a silicon interposer, has been a stopgap, its high cost—often exceeding 50% of the total package cost—and reliance on precious wafer capacity make it unsustainable for broad adoption.
This materials crisis is what opens the door for glass. With a dielectric constant nearly three times lower than silicon and a thermal expansion coefficient that can be precisely matched to silicon, glass substrates allow for signals that are 3.5 times faster while cutting power consumption by 50 percent. Intel, which plans to make glass substrates a central pillar of its packaging roadmap from 2026 to 2030, aims for a 10-fold increase in interconnect density. Samsung is already supplying glass substrate samples to Apple as of April 2026, targeting mass production after 2027, while TSMC sees it as the next logical step for its dominant CoWoS platform.
The core technology, Through-Glass Via (TGV), involves creating microscopic conductive holes through an ultra-thin glass panel to form the shortest possible electrical paths between chips. After years in the lab, recent breakthroughs in laser drilling and metallization have finally made TGV viable for mass production.
Chinese firms are emerging as key enablers. Woge Enterprise, for instance, demonstrated the ability to create vias with a 150:1 aspect ratio in 2024, and its subsidiary TongGev-Micro has already shipped samples of 1.6T optical module glass backplanes. In the materials space, South Korea's YC Chem recently became the first to supply qualified photoresists for glass substrates to a customer aiming for mass production by the end of 2026, according to a report from The Elec. These developments are rapidly driving down costs, with wafer-level TGV already estimated to be 30 percent cheaper than silicon-based through-silicon via (TSV) technology.
The shift is creating a new competitive front beyond the foundry giants. While Intel is leveraging its technology for a potential comeback, validated by a reported deal with Apple, a broader ecosystem is forming. Corning holds key patents in glass fusion processes, while equipment makers like Hanwha Semitech and China's D-laser are breaking new ground in panel-level processing and laser drilling equipment, respectively.
For investors, the transition to glass substrates presents opportunities across the supply chain. The first area includes integrated leaders who control the entire process, from specialty glass manufacturing to TGV technology. The second involves core equipment and material suppliers who are solving critical bottlenecks in via formation and metallization, such as YC Chem. Finally, downstream companies that are first to adopt the technology, including advanced packaging firms and optical module makers like Tongfu Microelectronics, JCET, and Eoptolink, are expected to gain a significant performance edge. The move to glass is not just a material upgrade; it's a foundational reset of the semiconductor supply chain, creating a multi-billion dollar market for the companies that can master the new technology.
This article is for informational purposes only and does not constitute investment advice.
