Inventors:
Steven T. Mayer - Lake Oswego OR, US
Mark L. Rea - Tigard OR, US
Richard S. Hill - Atherton CA, US
Avishai Kepten - Lake Oswego OR, US
R. Marshall Stowell - Wilsonville OR, US
Eric G. Webb - Tigard OR, US
Assignee:
Novellus Systems, Inc. - San Jose CA
International Classification:
H01L 21/302
US Classification:
438754, 438692, 438745, 438759, 216105
Abstract:
Plating accelerator is applied selectively to a substantially-unfilled wide (e. g. , low-aspect-ratio feature cavity. Then, plating of metal is conducted to fill the wide feature cavity and to form an embossed structure in which the height of a wide-feature metal protrusion over the metal-filled wide-feature cavity is higher than the height of metal over field regions. Most of the overburden metal is removed using non-contact techniques, such as chemical wet etching. Metal above the wide feature cavity protects the metal-filled wide-feature interconnect against dishing, and improved planarization techniques avoid erosion of the metal interconnect and dielectric insulating layer. In some embodiments, plating of metal onto a substrate is conducted to fill narrow (e. g. , high-aspect-ratio feature cavities) in the dielectric layer before selective application of plating accelerator and filling of the wide feature cavity.