Abstract
This chapter describes a novel low-temperature Au–Au bonding method using nanoporous Au–Ag powder and vacuum ultraviolet irradiation in the presence of oxygen gas (VUV/O3) pretreatment. The nanoporous powder, which was fabricated by dealloying Ag–Au alloy sheet, was used to form the bump structure on the Au substrate by simple filling process, while an Au-coated Si substrate was used as the chip. The VUV/O3-treated bumps and chip were bonded under a bonding pressure of 20 MPa at 200 °C for 20 min in a vacuum atmosphere of 1 kPa. A ligament size of the nanoporous structure on powder surface was found to be grown dramatically during bonding process. The tensile strength reached 10.1 MPa which is 2.3 times higher than that without VUV/O3 treatment. This suggests that organic contaminants on each ligament surface were effectively removed by VUV/O3 treatment, and consequently, the diffusion of gold atoms in the nanoporous powder was significantly promoted to change into bulk structure. The proposed method will be highly a promising method for 3D-LSI and MEMS packaging. And, we investigated the composition, morphology, and dissolution behavior of an Au–Ag nanoporous structure formed by electrodeposition and dealloying. Formation of the films was carried out by changing the bath composition and the annealing temperature. The samples that were annealed at 50 °C before dealloying indicated a finer nanoporous structure. This finer nanoporous structure is connected to the highest bond strength of the evaluated samples.
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Acknowledgements
This work is partly supported by Japan Ministry of Education, Culture, Sports Science & Technology (MEXT) Grant-in-Aid for Scientific Basic Research (S) No. 23226010 and Scientific Basic Research (B) No. 2528924. The authors thank for MEXT Nanotechnology Platform Support Project of Waseda University.
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Kaneda, T. et al. (2019). Electrode Formation Using Electrodeposition and Direct Bonding for 3D Integration. In: Setsuhara, Y., Kamiya, T., Yamaura, Si. (eds) Novel Structured Metallic and Inorganic Materials. Springer, Singapore. https://doi.org/10.1007/978-981-13-7611-5_39
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DOI: https://doi.org/10.1007/978-981-13-7611-5_39
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