Patent ID: 6200653
Filing Date: 2001-03-13
Classification: H01L

Abstract:
A method for forming an intermetal dielectric layer, comprising:providing a substrate;forming a plurality of metal conductive lines on the substrate, wherein a tied conductive line region and a loose conductive line region consist of the plurality of metal conductive lines;forming a biased-clamped intermetal dielectric layer on the substrate;forming an unbiased-unclamped protection layer on the biased-clamped intermetal dielectric layer wherein the unbiased-unclamped protection layer is thinner than the biased-clamped intermetal dielectric layer;forming a cap layer on the unbiased-unclamped protection layer; andperforming a planarization process on the cap layer until the unbiased-unclamped protection layer is exposed wherein the unbiased-unclamped protection layer serves as a stop layer.