Patent ID: 9214390
Filing Date: 2015-12-15
Classification: H01L

Abstract:
1. A method for forming a through silicon via (TSV) in an integrated circuit, said method comprising: providing a substrate of a first dopant impurity type and including a through silicon via (TSV) extending downwardly from a top surface of said substrate and including sidewalls; thermally diffusing dopant impurities of a second dopant impurity type into said sidewalls so as to form a well region in said substrate surrounding said TSV; after said thermally diffusing, performing a further thermal diffusion operation that introduces dopants of said first dopant impurity type into said sidewalls such that said well region includes an outer portion of said second dopant impurity type and an inner portion of said first dopant impurity type; thermally oxidizing said sidewalls after said further thermal diffusion operation; and filling said TSV with a conductive plug.