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Rapid fabrication of gold microsphere arrays with stable deep-pressing anisotropic conductivity for advanced packaging

Author

Listed:
  • An Cao

    (Chinese Academy of Sciences)

  • Yi Gong

    (Chinese Academy of Sciences
    China-Europe Electronic Materials International Innovation Center)

  • Dilong Liu

    (Chinese Academy of Sciences)

  • Fan Yang

    (Tiangong University)

  • Yulong Fan

    (Chinese Academy of Sciences
    Chinese Academy of Sciences
    Quantum Science Center of Guangdong-HongKong-Macao Greater Bay Area (Guangdong))

  • Yinghui Guo

    (Chinese Academy of Sciences
    Chinese Academy of Sciences)

  • Xingyou Tian

    (Chinese Academy of Sciences)

  • Yue Li

    (Chinese Academy of Sciences
    Tiangong University)

Abstract

Smooth metal microspheres with uniform sizes are ideal for constructing particle-arrayed anisotropic conductive films (ACF), but synthesis is hindered by challenges in controlling anisotropic metal growth. Here, we present a positioned transient-emulsion self-assembly and laser-irradiation strategy to fabricate pure gold microsphere arrays with smooth surfaces and uniform sizes. The fabrication involves assembling gold nanoparticles into uniform colloidosomes within a pre-designed microhole array, followed by rapid transformation into well-defined microspheres through laser heating. The gold nanoparticles melt and merge in a layer-by-layer manner due to the finite skin depth of the laser, leading to a localized photothermal effect. This strategy circumvents anisotropic growth, enables tunable control of microsphere size and positioning, and is compatible with conventional lithography. Importantly, these pure gold microspheres exhibit stable conductivity under deep compression, offering promising applications in soldering micro-sized chips onto integrated circuits.

Suggested Citation

  • An Cao & Yi Gong & Dilong Liu & Fan Yang & Yulong Fan & Yinghui Guo & Xingyou Tian & Yue Li, 2024. "Rapid fabrication of gold microsphere arrays with stable deep-pressing anisotropic conductivity for advanced packaging," Nature Communications, Nature, vol. 15(1), pages 1-12, December.
    • Handle: RePEc:nat:natcom:v:15:y:2024:i:1:d:10.1038_s41467-024-53407-x
    DOI: 10.1038/s41467-024-53407-x
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    References listed on IDEAS

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