Why Warpage Is the Key Challenge for AI Chip Packaging
A Deep Dive into Low-Temperature Curable PSPI, Balance Film, and the Supplier Landscape
The AI infrastructure buildout is often discussed in terms of chips and computing power. But beneath the surface, a set of supply chain bottlenecks is quietly shaping the pace and cost of deployment. Last week, we looked at glass substrates, and noted that warpage remains one of the major barriers to panel-level packaging at scale. This week, we go deeper: what’s actually causing the warp, and which materials are being developed to fix it.
As AI and HPC workloads drive chip packages to ever-larger form factors, the area utilization limits of circular wafers are becoming an increasingly important consideration. Panel-Level Packaging (PLP) addresses this directly by moving to square panels, which deliver higher area utilization and better alignment with large-die form factors.
Major foundries and OSATs including TSMC, Intel, Samsung, Rapidus, and Amkor are all advancing their PLP roadmaps. TSMC, through its subsidiary VisEra, plans to establish a CoPoS pilot line with trial production targeted for 2027, positioning 2026 as a critical window for product validation and deliveries for related equipment and material providers.
The central technical challenge, however, is warpage. As panel size grows and layer counts increase, thermal stress from CTE mismatches between materials compounds in ways that directly affect yield. To address this issue, specialty chemical suppliers such as AMC, WaferChem, and Everlight Chemical showcased corresponding solutions at Touch Taiwan 2026 in April. This article focuses on two key material approaches, Low-Temperature Curable PSPI and Balance Film, and maps out the current supplier landscape.