Patent ID: 6313027
Filing Date: 2001-11-06
Classification: C23C,H01J,H01L

Abstract:
A process for sputter depositing material into a high aspect ratio via of a structure formed on a substrate, the process comprising:sputtering a refractory metal target and ionizing at least about 10% of the material sputtered from the refractory metal target to form a first layer on a sidewall of the via;sputtering a refractory metal target and ionizing at least about 10% of the material sputtered from the refractory metal target while flowing a reactive gas to mix with the sputtered, partially ionized material to form a second layer over the first layer;reducing the flow of the reactive gas while sputtering and ionizing at least about 10% of the material sputtered from the refractory metal target to form a third layer over the second layer;sputtering a conductive target to form a seed layer over the third layer at a substrate temperature of less than about 150.degree. C.; andsputtering the conductive target using conventional sputtering to form a conductive layer over the seed layer at a substrate temperature between about 300.degree. C. and about 450.degree. C. to fill the via without significant voids.