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Enhanced Nanotwinned Copper Bonding through Epoxy-Induced Copper Surface Modification.

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  • 1Department of Materials Science and Engineering, National Yang Ming Chiao Tung University, Hsinchu 30010, Taiwan.

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Summary

Researchers developed a novel epoxy resin surface modification for copper (Cu) films. This method enhances Cu-Cu bonding in 3D integrated circuits (3D ICs) at lower temperatures, improving reliability for advanced electronics.

Keywords:
Cu–Cu direct bondingabnormal grain growthgrain refinementnanotwinned Cusurface modification

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Area of Science:

  • Materials Science and Engineering
  • Semiconductor Manufacturing
  • Nanotechnology

Background:

  • Moore's Law is approaching physical limits, necessitating advanced semiconductor packaging solutions.
  • Three-dimensional integrated circuits (3D ICs) offer a path to continued scaling through vertical integration.
  • Copper-copper (Cu-Cu) bonding is crucial for 3D ICs, but low-temperature diffusion limits reliability.

Purpose of the Study:

  • To investigate a new surface modification technique for enhancing Cu-Cu bonding in 3D ICs.
  • To improve the reliability of 3D ICs by enabling effective bonding at temperatures below 300 °C.
  • To explore the use of epoxy resin for grain refinement on nanotwinned Cu films.

Main Methods:

  • Surface modification of nanotwinned Cu films using epoxy resin to create fine grains.
  • Cu-Cu bonding experiments conducted at temperatures of 250 °C and 300 °C.
  • Microstructural analysis of the bonded interfaces to observe grain growth and interface evolution.

Main Results:

  • At 250 °C, interfacial grains showed significant growth into both Cu films.
  • At 300 °C, extensive grain extension occurred, completely eliminating the original weak bonding interface.
  • The epoxy resin modification effectively promoted robust Cu-Cu bonding at reduced temperatures.

Conclusions:

  • The proposed epoxy resin surface modification is a viable strategy for enhancing Cu-Cu bonding in 3D ICs.
  • This method overcomes the limitations of low-temperature solid diffusion, improving interface reliability.
  • The findings contribute to the development of more scalable and reliable advanced semiconductor devices.