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Eutectic Bonding Utilizing Radio Frequency Induction Heating for Fabricating Vertical Light-Emitting Diodes.

Eunmi Choi, Areum Kim, Yinhua Cui

    Journal of Nanoscience and Nanotechnology
    |January 5, 2016
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    Researchers optimized radio frequency induction heating for eutectic bonding in vertical light-emitting diodes (VLEDs). This faster method, using Sn-Glass or Au/Sn alloy, achieves void-free bonding in under 30 minutes, reducing costs and process time.

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    Area of Science:

    • Materials Science
    • Semiconductor Manufacturing
    • Optoelectronics

    Background:

    • Vertical light-emitting diodes (VLEDs) offer superior thermal, electrical, and optical performance over conventional LEDs.
    • Fabrication of VLEDs necessitates a bonding technique post-laser lift-off.
    • Eutectic bonding is favored for its low-heat and safe production process.

    Purpose of the Study:

    • To address the prolonged process times and associated costs of conventional resistance heating for eutectic bonding.
    • To optimize radio frequency (RF) induction heating for efficient eutectic bonding in VLED fabrication.
    • To evaluate the impact of coil diameter on thermal efficiency for RF induction heating.

    Main Methods:

    • Investigated RF induction heating as an alternative to conventional resistance heating.
    • Measured thermal efficiency by varying the coil diameter in the RF induction heating setup.
    • Tested Sn-Glass and a standard Au (20 wt%)/Sn (80 wt%) alloy for eutectic bonding.

    Main Results:

    • Successful void-free eutectic bonding was achieved in under 30 minutes using Sn-Glass.
    • The Au/Sn alloy, commonly used for VLEDs, also facilitated void-free eutectic bonding within the 30-minute timeframe.
    • RF induction heating demonstrates significantly improved process efficiency compared to resistance heating.

    Conclusions:

    • Optimized RF induction heating provides a rapid and efficient solution for eutectic bonding in VLED manufacturing.
    • The developed method reduces process time, potentially lowering production costs and improving throughput.
    • This technique is viable for both Sn-Glass and standard Au/Sn alloy interlayers, ensuring compatibility with existing VLED fabrication processes.