Patent ID: 6743728
Filing Date: 2004-06-01
Classification: H01L

Abstract:
A method for forming a shallow trench isolation, comprising:providing a substrate; forming a mask layer on the substrate; etching the mask layer to expose a portion of the substrate; etching a portion of the substrate to form a trench; forming a liner layer on the inside wall of the trench; sequentially depositing a first dielectric layer and a sacrificial layer on the substrate such that the trench is substantially filled, wherein the first dielectric layer is formed by high density plasma chemical vapor deposition (HDPCVD); removing portions of the first dielectric layer and the sacrificial layer from the trench; depositing a second dielectric layer on the substrate such that the trench is substantially filled, wherein the second dielectric layer is formed by high density plasma chemical vapor deposition (HDPCVD); and planarizing the second dielectric layer to remove a portion of the second dielectric layer from the trench.