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    Wafer Level Super Stretch Solder

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    6890795.pdf (490.8Kb)
    Date
    5/10/2005
    Author
    Wong, Ee Hua
    Rajoo, Ranjan
    Teo, Poi Siong
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    Abstract
    We disclose a technique to generate stretched solder columns (bumps) at the wafer level, suitable for wafer level packaging. This is accomplished through use of using two wafers - the standard (functional) wafer that contains the integrated circuits and a master (dummy) wafer on whose surface is provided an array of solder bumps that is the mirror image of that on the functional wafer. After suitable alignment, both sets of solder bumps are melted and then slowly brought together till they merge. Then, as they cool, they are slowly pulled apart thereby stretching the merged solder columns. Once the latter have fully solidified, they are separated from the master wafer only.
    URI
    http://hdl.handle.net/1853/57571
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