Radical step coverage improvement in directional beam target (DBT) sputter
A novel sputter with directional beam target (DBT) and Lisitano ECR antenna for Cu seed/barrier is designed and tested. Deposition characteristics of DBT show superior step coverage with no other significant degradation against planar target. DBT sidewall uniformity is 17% for 6:1 aspect ratio trench, which is far better than commercial leading edge sputters. The uniformity of 300mm Endura CuBS PVD (SIP EnCoRe II Cu) and INOVA NExT (HCM IONX XL) are 45.5% and 40.3%. The technology can be scaled through proper ratio of DBT to meet future generation Cu technology.
step coverage directional beam target (dbt) sputter ecr lisitano antenna high density plasma cu seed layer/barrier