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Related Experiment Video

Updated: Aug 30, 2025

Fabrication of Uniform Nanoscale Cavities via Silicon Direct Wafer Bonding
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Electroplated Al Press Marking for Wafer-Level Bonding.

Muhammad Salman Al Farisi1,2, Takashiro Tsukamoto1, Shuji Tanaka1,3

  • 1Department of Robotics, Graduate School of Engineering, Tohoku University, Sendai 980-8579, Japan.

Micromachines
|August 26, 2022
PubMed
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This study introduces a novel aluminum (Al) wafer bonding technique for micro-electro mechanical systems (MEMS) and complementary metal oxide semiconductor (CMOS) integration. The method achieves strong bonds at lower temperatures by using mechanical deformation to remove native oxides.

Area of Science:

  • Materials Science
  • Electrical Engineering
  • Nanotechnology

Background:

  • Heterogeneous integration of MEMS and CMOS is crucial for advanced microdevices.
  • Aluminum (Al) is a cost-effective material for wafer bonding but typically requires high temperatures (>450 °C) due to its native oxide layer.
  • High-temperature bonding limits compatibility with CMOS processes and can affect device performance.

Purpose of the Study:

  • To demonstrate a novel Al wafer bonding technique for heterogeneous integration.
  • To enable low-temperature bonding by overcoming the challenge of the native aluminum oxide.
  • To investigate the effect of bonding temperature on the quality and strength of Al-bonded substrates.

Main Methods:

  • Utilized an electroplated Al bonding frame for wafer bonding.
Keywords:
MEMSaluminumelectroplatingpress markingwafer bonding

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  • Employed a press-marking technique using groove structures on the counter wafer to induce localized mechanical deformation.
  • Mechanically removed the native oxide layer at the bonding interface through significant deformation.
  • Investigated bonding at temperatures ranging from 250 °C to 450 °C.

    • Main Results:

    • Successfully demonstrated wafer bonding using the electroplated Al frame and press-marking method.
    • Achieved bonding at temperatures as low as 250 °C, significantly reducing thermal budget.
    • Obtained bonding shear strengths between 8-100 MPa, comparable to high-temperature Al bonding methods.
    • Showcased the removal of native oxide and formation of a fresh Al interface via mechanical deformation.

    Conclusions:

    • The developed Al wafer bonding technique effectively integrates MEMS and CMOS devices at reduced temperatures.
    • Mechanical deformation-induced oxide removal is a viable mechanism for low-temperature Al wafer bonding.
    • This approach offers a promising pathway for advanced heterogeneous integration with improved process compatibility.