Patent ID: 6551856
Filing Date: 2003-04-22
Classification: H01L

Abstract:
A method for forming copper pad redistribution comprising the steps of:providing a pre-processed semiconductor substrate having a first plurality of copper bond pads in a top surface, planarizing said semiconductor substrate by chemical mechanical polishing, forming a passivation layer on said planarized top surface of the semiconductor substrate, patterning and etching said passivation layer openings for a first plurality of redistribution vias, a first plurality of redistribution pads and a second plurality of redistribution lines connecting said first plurality of redistribution vias and said first plurality of redistribution pads by a dry etching method wherein sidewall passivation forms in openings of said plurality of redistribution lines stopping said etching in said passivation layer while opening for said first plurality of redistribution vias are etched through in said passivation layer to expose surfaces of said first plurality of copper bond pads, depositing copper into said openings for said first plurality of redistribution vias, said first plurality of redistribution pads and said second plurality of redistribution lines, and planarizing said semiconductor substrate forming said first plurality of redistribution vias and said second plurality of redistribution lines.