Patent ID: 8703575
Filing Date: 2014-04-22
Classification: H01L

Abstract:
1. A structure of an isolation area, comprising: a substrate having a first type of ion dopants, the substrate having a first trench and a plurality of second trenches, wherein the substrate defines two cell areas and an isolation area between the cell areas, the first trench is formed in the isolation area, and the second trenches are respectively formed in the cell areas, wherein the first and second trenches have the same depth, and the side wall of each of the first and second trenches has an oxidation layer formed thereon, wherein the first trench is filled up fully with an insulating structure in forming a non-metallic isolation area, and each second trench is filled partially with a metallic structure and partially with an insulating structure, wherein a second type of ions is implanted into the substrate under the first trench to increase the level of electrical isolation between the cell areas.