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A Wafer-Level Three-Dimensional Integration Scheme With Cu TSVs Based on Microbump/Adhesive Hybrid Bonding for Three-Dimensional Memory Application

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12 Author(s)
Cheng-Ta Ko ; Department of Electronics Engineering, National Chiao Tung University, Hsinchu , Taiwan ; Zhi-Cheng Hsiao ; Yao-Jen Chang ; Peng-Shu Chen
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Thin wafer/chip stacking with vertical interconnect by a Cu through-silicon via (TSV) and a Cu/Sn microjoint is one of the candidates for 3-D integration. The insertion loss of the two-chip stack was evaluated with different TSV pitches, microbump diameters, and chip thicknesses to realize the signal transmission effects in high-speed digital signaling via TSV and microjoint interconnection. In addition, a wafer-level 3-D integration scheme with Cu TSVs based on Cu/Sn microbump and BCB adhesive hybrid bonding was demonstrated. Key technologies, including TSV interconnection, microbumping, hybrid bonding, wafer thinning, and backside RDL formation, were well developed and integrated to realize 3-D integration. This paper presents a complete study of the structure design, the process condition, and the electrical and reliability assessment of the wafer-level 3-D integration scheme. This 3-D integration scheme with excellent electrical performance and reliability provides a promising solution for 3-D memory application.

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IEEE Transactions on Device and Materials Reliability  (Volume:12 ,  Issue: 2 )