Patent ID: 6790740
Filing Date: 2004-09-14
Classification: H01L

Abstract:
A process for filling a polysilicon seam, comprising the following steps:providing a semiconducting substrate having a trench, into which a first polysilicon layer having a seam is filled, wherein a dielectric layer is disposed on an inner wall of the trench and the first polysilicon layer is disposed on a sidewall of the dielectric layer to fill the trench; etching the first polysilicon layer to expose the seam; forming a second polysilicon layer over a surface of the semiconducting substrate and on the sidewall of the dielectric layer in the trench to fill a top portion of the seam and close the seam; removing the second polysilicon layer from the surface of the semiconducting substrate and from the inner wall of the trench, only leaving the second polysilicon layer at the top portion of the seam; and removing the dielectric lever exposed on the inner wall of the trench.