Patent ID: 7187078
Filing Date: 2007-03-06
Classification: H01L

Abstract:
1. A bump structure on a semiconductor substrate comprising: a semiconductor substrate having at least one contact pad and an upper passivation layer having at least one opening formed therein exposing a portion of the contact pad; at least one patterned and etched polymer layer formed directly on a central portion of the contact pad, wherein height of the patterned and etched polymer layer is less than ½ width of the contact pad; at least one patterned and etched conductive metal layer formed directly above the polymer layer and being aligned therewith, wherein thickness of the patterned and etched conductive metal layer exceeds ⅓ height and ⅓ width of the patterned and etched polymer layer; and at least one layer of solder material having a solder height provided above the conductive metal layer, the layer of solder being aligned with the conductive metal layer, the layer of solder having been reflown thereby creating a solder ball.