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Microvias of 50 μm diameter in a Si chip were filled with Zn or Sn-Zn to form through-silicon vias by means of an electroplating/reflow process or a dipping method. In the case of the electroplating/reflow process, Zn was electroplated on a Cu seed layer in via holes, and a reflow was then performed to fill the via holes with the electroplated Zn. In the case of the dipping method, Zn via-filling...
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