Patent ID: 6479376
Filing Date: 2002-11-12
Classification: H01L

Abstract:
An aluminum bump process, comprising the steps of:providing a silicon substrate having contact pads provided thereon; forming a composite layer of passivation over the surface of said silicon substrate and said contact pads; depositing a first layer of photoresist over the surface of said composite layer of passivation; patterning and developing said first layer of photoresist and said composite layer of passivation, creating first openings through said first layer of photoresist and said composite layer of passivation, exposing said contact pads through said first openings; forming a layer of bump metal over the surface of said patterned and developed first layer of photoresist, filling said first openings; depositing a second layer of photoresist over the surface of said layer of bump metal; patterning and developing said second layer of photoresist, forming second openings through said second layer of photoresist, said second openings being aligned with said patterned and developed first layer of photoresist; etching said layer of bump metal in accordance with said second openings created through said second layer of photoresist, exposing said patterned and developed first layer of photoresist; and removing said patterned and developed first layer of photoresist and said patterned and developed second layer of photoresist.