Hybrid Bonding
Copper-to-copper direct bonding replaces micro-bumps for 3D integration, achieving sub-1μm interconnect pitch, 10× density improvement, and the physical foundation for UCIe 3.0 at 64 GT/s.
Обзор
Hybrid bonding is the cutting edge of 3D integration, replacing traditional micro-bump interconnects with direct copper-to-copper bonding. In this process, both copper pads and the surrounding dielectric are planarized to atomic flatness, then brought into contact at room temperature. A low-temperature anneal (typically 200–400°C) causes the copper to expand and bond, creating a seamless, ultra-dense interconnect with pitch below 1μm — a 10× improvement over the best μ-bump technology.
Hybrid bonding is the physical enabler for UCIe 3.0, which targets 64 GT/s per lane. The technology exists in two forms: wafer-to-wafer (W2W) for homogeneous stacking (e.g., CMOS image sensors, 3D NAND) and die-to-wafer (D2W) for heterogeneous integration (e.g., logic-on-logic, logic-on-memory). GINECHIP supports both flows with ultra-flat CMP-polished wafers, SOI bonding substrates, and ultra-thin wafer processing.
Key Technology Features
Cu-Cu Direct Bonding
Copper pads embedded in a dielectric matrix (typically SiO₂) are polished to sub-nanometer roughness. When brought into contact, van der Waals forces initiate bonding, and a subsequent anneal causes copper diffusion across the interface, forming a monolithic electrical connection without solder or underfill.
Atomic-Scale Planarization
CMP is the critical process for hybrid bonding. Copper must be recessed slightly below the dielectric surface (typically 2–5nm dishing) to allow room-temperature dielectric contact first, followed by copper expansion during anneal. GINECHIP's CMP services achieve the required surface specifications.
Ultra-Thin Wafer Handling
For 3D stacking, wafers must be thinned to <50μm (and often <10μm) to minimize stack height. GINECHIP's Taiko process and temporary bonding/debonding capabilities enable safe handling of ultra-thin wafers through the hybrid bonding process flow.
Die-to-Wafer (D2W) Integration
D2W hybrid bonding enables heterogeneous 3D integration by placing known-good dies onto a target wafer. This approach combines the yield advantages of die-level testing with the interconnect density of hybrid bonding, and is the preferred path for logic-on-memory and logic-on-logic 3D stacking.
GINECHIP Solutions
CMP-polished wafers with sub-nanometer surface roughness, controlled copper dishing (<5nm), and TTV <1μm for hybrid bonding-ready surfaces.
SOI wafers with precisely controlled BOX and device layer thickness, optimized for the hybrid bonding thermal budget and compatible with both W2W and D2W flows.
Taiko grinding and thinning services achieving wafer thickness <50μm with minimal edge chipping and warp, essential for 3D stacked device fabrication.
Temporary and permanent wafer bonding services including fusion bonding, anodic bonding, and adhesive bonding for carrier support during thinning and hybrid bonding processes.
Target Applications
Hybrid bonding is being adopted for next-generation CMOS image sensors (Sony), 3D NAND flash (YMTC, Kioxia/WD), high-bandwidth memory (HBM4 and beyond), and 3D-stacked logic (Intel Foveros Direct, TSMC SoIC). The technology is also critical for backside power delivery networks (BSPDN) and upcoming 3D heterogeneous integration platforms for AI accelerators.
Prepare for Hybrid Bonding
From ultra-flat CMP wafers to SOI substrates and Taiko thinning, GINECHIP equips your hybrid bonding process with the precision materials and services you need.