Patent ID: 7078272

Claim:
A method of making a microelectronic device comprising: making a device B comprising providing a structure having a first bond pad, depositing and patterning a photoresist layer over the device B and wherein an opening is provided in the photoresist layer aligned with the first bond pad, depositing a first electrically conductive material having a first reflow temperature into the opening in the photoresist layer and over the first bond pad, and depositing a second electrically conductive material having a second reflow temperature by a method comprises electroplating into the opening in the photoresist layer and over the first electrically conductive material, and wherein the second reflow temperature is less than the first reflow temperature, removing the photoresist layer and heating the device B to a temperature sufficient to reflow the second electrically conductive material but not the first electrically conductive material so that the second electrically conductive material encapsulates the first electrically conductive material to provide a first bump for making an electrical connection to device B.