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    Proximity Lithography in Sub-10 Micron Circuitry for Packaging Substrate

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    COPE_261.pdf (1.282Mb)
    Date
    2010-11
    Author
    Wang, Fengtao
    Liu, Fuhan
    Kong, Linghua
    Sundaram, Venky
    Tummala, Rao R.
    Adibi, Ali
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    Abstract
    Rapid changes in the semiconductor industry will continue toward higher functionality that leads to higher input/outputs (I/O) counts, pushing packaging towards higher density architectures. In the next two to three years, the I/O pitch will fall within 100 μm for area array die and 30 μm for periphery die. That raises an important question to the packaging industry: How will the rapid shrinkage of the I/O pitch affect the package substrate for chip attaching? The answer is sub-10 micron copper line technology. Theoretical and experimental studies on the limitations of using mercury i-line ultraviolet photolithography have been carried at the Packaging Research Center at Georgia Tech. Furthermore, ultra fine copper line routing substrates are demonstrated for flip chip attaching by using semi-additive metallization process.
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    http://hdl.handle.net/1853/47783
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