Patent ID: 6117784
Filing Date: 2000-09-12
Classification: H01L,H05K

Abstract:
A method for providing metal wire in an integrated circuit which comprises sputter coating copper at a temperature of less than about 100.degree. C. and without annealing onto a semiconductor substrate to provide a copper seed layer of about 20 to about 100 nanometers; wherein said copper seed layer has grains less than about 300 .ANG. and stress of at least about 5.times.10.sup.9 dynes; depositing on said copper seed layer a photoresist and patterning said photoresist;electroplating or electrolessly plating a metal within the openings of the patterned photoresist onto the exposed copper seed layer; stripping the remaining photoresist; and etching the exposed copper seed layer not covered by the electroplated or electrolessly plated metal using an etchant that preferentially etches said copper seed layer at a rate higher than that for the electroplated or electrolessly plated metal; and wherein said etchant comprises a persulfate and a surfactant.