Patent ID: 9653507
Date: 2017-05-16
CPC Classifications: H01L

Claim:
1. A deep trench isolation (DTI) structure, comprising: a semiconductor substrate having an upper semiconductor surface; a functional layer disposed over the upper semiconductor surface; a capping layer disposed over the functional layer; a deep trench, which has a deep trench width as measured between opposing deep trench sidewalls, formed through the capping and functional layers, and extending beneath the upper semiconductor surface to a first depth; a fill material in the deep trench; and a protective sleeve extending into the semiconductor substrate and partially along the sidewalls of the deep trench between the fill material and the functional layer; and a dielectric liner arranged along a lower surface and the sidewalls of the deep trench, the dielectric liner being arranged between innermost sidewalls of the protective sleeve and corresponding outer sidewalls of the fill material to separate the innermost sidewalls of the protective sleeve from the corresponding outer sidewalls of the fill material.