High-speed TSV filling with molten solder
A novel technique of vacuum-assisted via filling with molten solder was developed in this study. The diameter of the TSV was 30?m and its depth was 100200?m. The vacuum pressure applied ranged from 0.02 to 0.08MPa. Molten solder was filled into the via holes by pressure differences between the upper and lower side of Si wafer. The filling time for TSVs with diameter of 30?m and depth of 200?m was less than 4s, which is much faster than conventional via filling techniques.
tsv filling solder vacuum via wave soldering reflow