Patent ID: 6737323
Filing Date: 2004-05-18
Classification: H01L

Abstract:
A method for fabricating a trench structure in a substrate, the method comprising the steps of:(a) forming a trench in a substrate; (b) forming a dielectric material lining at least a wall of the trench; (c) forming a buffer layer on the dielectric material to fill a first portion of the trench, the buffer layer having a first electrical conductivity; (d) substantially filling a remainder of the trench with a high-conductivity material having a second electrical conductivity, the second electrical conductivity being greater than the first electrical conductivity; and (e) forming a polycide layer in the trench between the buffer layer and the high-conductivity materials, wherein the polycide layer, the buffer layer and the high-conductivity material are in the trench after (e).