Patent ID: 6221786
Filing Date: 2001-04-24
Classification: H01L

Abstract:
A method for isolating interconnects, the steps comprising:providing a substrate;forming a first insulating layer over the substrate;forming a first interconnect over the first insulating layer;forming a first stop layer overlying the first interconnect and the first insulating layer;forming a second insulating layer over the first stop layer;forming a photoresist pattern layer over the second insulating layer;using the photoresist pattern layer as a mask and etching the exposed second insulating layer to the first stop layer to define two bridge-supporting structures beside the first interconnect;forming a second stop layer overlying the first stop layer and the bridges supporting structure;forming an intermetal-dielectric layer with a thickness greater than that of the bridge-supporting structures over the second insulating layer;applying a planarization treatment by etching back the intermetal-dielectric layer to the second stop layer on the bridge-supporting structures;forming a third stop layer over the inter-metal dielectric layer;forming a second interconnect over the third stop layer, wherein the orientation of the second interconnect crosses over the first interconnect;forming a passivation layer overlying the second interconnect and the third stop layer;defining at least one channel through the passivation layer, the third stop layer, the second stop layer and exposing the inter-metal dielectric layer;dissolving the inter-metal dielectric layer completely with a suitable solvent through the channel to form a chamber for isolating the first and second interconnects;drying to evaporate water and solvent in the chamber; andsealing the chamber.