Patent ID: 9159564
Filing Date: 2015-10-13
Classification: H01L

Abstract:
1. A method of shielding through silicon vias (TSVs) in a passive interposer, the method comprising: doping a substrate with positive ions; implanting positive ions in an upper portion of the substrate, such that the substrate has at least a p-doped portion and a heavily p-doped upper portion, wherein the heavily p-doped upper portion extends substantially across an entirety of the substrate; forming an interlayer dielectric (ILD) above the heavily p-doped upper portion; forming a plurality of through silicon vias (TSVs) through the ILD and the substrate, such that the passive interposer is configured to electrically couple at least one structure above and below the passive interposer; and forming, between pairs of TSVs of the plurality of TSVs, a plurality of shielding lines through the interlayer dielectric, the shielding lines configured to electrically couple the heavily p-doped upper portion of the substrate and at least one interconnect structure above the ILD, and the heavily p-doped upper portion separates the plurality of shielding lines from the p-doped portion of the substrate.