Patent ID: 6013937
Filing Date: 2000-01-11
Classification: H01L,Y10S

Abstract:
A semiconductor chip fabricated by the method of:providing a semiconductor chip having a pad layer disposed on a semiconductor substrate;forming a dielectric layer on the pad layer;forming a buffer layer on the dielectric layer, the buffer layer being made from different material than the dielectric layer;forming a mask layer on the buffer layer, the mask layer being made from different material than the buffer layer;forming at least one trench in the semiconductor chip, each trench being formed in a portion of a top surface of the semiconductor chip through the mask, buffer, and dielectric layers, and through a portion of the substrate;depositing a filler in the at least one trench and on the top surface;polishing the filler from the top surface to expose a portion of the mask layer;forming at least one dielectric collar in the at least one trench;etching the exposed portion of the mask layer after formation of said dielectric collar, to expose a portion of the buffer layer; andremoving the exposed portion of the buffer layer after etching said mask layer, to expose a portion of the dielectric layer.