Patent ID: 6057202
Filing Date: 2000-05-02
Classification: H01L

Abstract:
A method for manufacturing an inductor with resonant frequency and Q value increased in semiconductor process, comprising:preparing a substrate on which a plurality of field oxide layers are already formed;forming a first dielectric layer on said substrate and said plurality of field oxide layers;performing a CMP process on said first dielectric layer;forming a plurality of trenches in said first dielectric layer and said substrate between said field oxide layers;forming a stuffing layer on said first dielectric layer and in said plurality of trenches;performing a CMP process on said stuffing layer to remove part of said stuffing layer over said first dielectric layer, that is, remaining stuffing layers are still located only in said plurality of trenches;forming a second dielectric layer on said first dielectric layer and said remaining stuffing layers;forming a plurality of small trenches corresponding to said plurality of trenches on said second dielectric layer;removing said remaining stuffing layers in said plurality of trenches;forming a third dielectric layer with high viscosity on said second dielectric layer, wherein said third dielectric layer cannot flow into said plurality of trenches because of the high viscosity of said third dielectric layer and tiny sizes of said plurality of small trenches; andforming a spiral metal layer on said third dielectric layer just over said plurality of trenches.