Patent ID: 6667535
Filing Date: 2003-12-23
Classification: H01L

Abstract:
A fuse structure, comprising:an optimal position of laser spot defined above a substrate; a first conductive layer formed on part of the substrate; a first dielectric layer formed on the substrate and the first conductive layer; a second conductive layer formed on the first dielectric layer, wherein the first conductive layer is located under the second conductive layer, thereby protecting the first conductive layer from damage during a laser blow process; a second dielectric layer formed on the first dielectric layer and the second conductive layer; a third conductive layer comprising the position of laser spot formed on part of the second dielectric layer; a plurality of first conductive plugs penetrating the first dielectric layers to electrically connect the first conductive layer and the second conductive layer; and at least one second conductive plug penetrating the second dielectric layer, to electrically connect the second conductive layer and the third conductive layer, wherein the first conductive layer serves as a backup conductive layer to electrically connect the third conductive layer and the second conductive layer via the first conductive plugs and the second conductive plug when the second conductive layer is broken during the laser blow process.