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Introduction to microbump and hybrid bonding technology Microbump technology, a well-established technology in semiconductor packaging, relies on the Thermal Compression Bonding (TCB) process and has a widespread application across various products. Its evolutionary path primarily revolves around continually scaling bumping pitch. However, a significant hurdle arises as the shrinking solder ball sizes lead to heightened formation of Intermetallic Compounds (IMCs), consequently compromising conductivity and mechanical properties. Moreover, the proximity of contact gaps may induce solder ball bridging during reflow, posing a risk of chip failure. Since solder and IMCs exhibit higher resistivity than copper, their utilization in high-performance component packaging encounters limitations. On the other hand, hybrid bonding presents a paradigm shift by establishing interconnections through a combination of dielectric material (for example, SiO2 or SiCN) and embedded metal (Cu). Notably, Cu-Cu hybrid bonding has achieved pitches below 10 micrometers, typically around single-digit µm values. This advancement brings forth several benefits, including expanded I/O, heightened bandwidth, improved 3D vertical stacking, enhanced power efficiency, and reduced parasitics and thermal resistance attributed to the absence of underfill. However, challenges persist in the form of manufacturing complexities and elevated costs associated with this advanced technique. Three ways of Cu-Cu hybrid bonding There are three primary methods for achieving hybrid bonding: die-to-die (D2D), die-to-wafer (D2W), and wafer-to-wafer (W2W). Each approach offers distinct advantages and disadvantages, influencing its suitability for various applications. Die-to-Die bonding offers the highest assembly yield since both dies can undergo individual testing before bonding. This method also provides the highest design flexibility. However, it suffers from very low throughput and presents significant challenges during the process, particularly regarding edge effects, contamination, and particles introduced during singulation. Additionally, die-to-die bonding requires pick & place equipment with exceptionally high accuracy. Due to these manufacturing challenges and low throughput, this method currently has limited commercial use in hybrid bonding applications. Wafer-to-wafer bonding stands out for its highest throughput, which is crucial in the semiconductor industry. Its process steps are simpler compared to die-to-die bonding, as it eliminates the need for cutting dies and pick and place procedures. However, wafer-to-wafer bonding may result in lower yield and reduced design flexibility, as the top and bottom dies must be the same size. Despite these drawbacks, wafer-to-wafer bonding remains the most commonly employed approach for Cu-Cu hybrid bonding in current commercial applications. Die-to-wafer bonding occupies a middle ground between die-to-die and wafer-to-wafer methods. This approach provides higher design flexibility and yield compared to wafer-to-wafer bonding. However, it faces challenges related to lower throughput and more complex processing requirements. Despite these challenges, die-to-wafer bonding has gained momentum due to its ability to strike a balance between design flexibility and manufacturing efficiency. Overall, the choice of hybrid bonding method depends on factors such as assembly yield requirements, design flexibility, throughput considerations, and processing challenges. Each approach offers distinct trade-offs, shaping its applicability in semiconductor packaging and integration. How hybrid bonding is implemented in HPC chips The most prominent adoption of hybrid bonding is AMD employing TSMC's 3D SOIC (hybrid bonding) technology for stacking L3 cache die onto a computing chip in two product lines: the consumer AMD Ryzen 7000X3D CPU for desktops (incl. AMD Ryzen™ 9 7950X3D and AMD Ryzen 7 5800X3D) and the EPYC processor for high-performance computing (HPC). AMD emphasizes hybrid bonding's role in surpassing their power efficiency goals with chiplet and 3D-enabled architecture. They highlight its superiority over micro bump 3D technology, citing 15 times higher interconnect density and 3 times greater energy efficiency. Other examples include Graphcore's Bow Intelligence Processing Unit (BOW) is the world's first 3D Wafer-on-Wafer (WoW) processor, utilizing TSMC 7 nm technology and TSMC 3D SoIC technology for a 3D die, featuring 1,472 IPU-Core tiles with 900MB of in-processor memory, offering up to 40% faster AI performance and 16% better performance-per-Watt compared to its 2D predecessor. Another key example is the utilization of hybrid bonding in high-bandwidth memory (HBM). Major players in the HBM market, such as SK Hynix, Samsung, and Micron, are increasingly exploring hybrid bonding for their applications. While microbump stacking has been the traditional method in HBM, the growing demand for enhanced bandwidth expansion and power efficiency is driving the active investigation of hybrid bonding. The commercialization of hybrid bonding-based HBMs is expected in the next generation or thereafter, offering a substantial competitive advantage over microbump-based alternatives. This provides these competitors with a strong edge against the current market leader. Summary Hybrid bonding is poised to revolutionize the landscape of future HPC and AI products, offering a host of advantages that will shape the industry's path forward. As technology advances and demands for increased computing power and efficiency continue to surge, hybrid bonding emerges as a key enabler for meeting these evolving needs. The IDTechEx report, "Advanced Semiconductor Packaging 2024-2034: Forecasts, Technologies, Applications", delves into the dynamic landscape of 2.5D and 3D semiconductor packaging, analyzing technology trends, industry barriers, and market forecasts across AI, HPC, 5G/6G, autonomous vehicles, and consumer electronics sectors. With unbiased analysis and detailed market evaluations, this report provides a comprehensive understanding of the industry's future, making it essential reading for stakeholders navigating the evolving semiconductor landscape. To find out more about the "Advanced Semiconductor Packaging 2024-2034: Forecasts, Technologies, Applications" report, including downloadable sample pages, please visit www.IDTechEx.com/ASP. For a deeper understanding of materials and processing in Cu-Cu hybrid bonding, refer to IDTechEx's related report, "Materials and Processing for Advanced Semiconductor Packaging 2024-2034". This report offers valuable insights into manufacturing processes, material selection, and successful case studies, aiding stakeholders in achieving optimal outcomes. To find out more about the "Materials and Processing for Advanced Semiconductor Packaging 2024-2034" report, including downloadable sample pages, please visit www.IDTechEx.com/MatsforASP. For the full portfolio of semiconductor market research from IDTechEx, please visit www.IDTechEx.com/Research/Semiconductors. About IDTechEx: IDTechEx provides trusted independent research on emerging technologies and their markets. Since 1999, we have been helping our clients to understand new technologies, their supply chains, market requirements, opportunities and forecasts. For more information, contact research@IDTechEx.com or visit www.IDTechEx.com. Social Media Links: Logo: https://mma.prnewswire.com/media/478371/IDTechEx_Logo.jpg Media contact:
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