Patent ID: 9142533
Filing Date: 2015-09-22
Classification: H01L

Abstract:
1. A device comprising: a first substrate having a first conductive pillar and a first conductive cap layer over the first conductive pillar, the first conductive pillar having tapered sidewalls extending from an upper surface, the first conductive cap layer having a first width W a second substrate having a conductive pad and a passivation layer, the passivation layer covering at least a portion of the conductive pad, the second substrate further comprising a second conductive pillar extending through the passivation layer and contacting the conductive pad, the second conductive pillar having a second conductive cap layer extending over a top surface and sidewalls of the second conductive pillar, the second conductive cap layer having a contact surface, the contact surface having a second width W a conductive material attaching the first conductive cap to the contact surface.