SEMICONDUCTOR DEVICE HAVING FINFET AND METHOD OF FORMING THE SAME

摘要

In one embodiment, a semiconductor device includes a plurality of fin-shaped active regions defined by a trench formed in a substrate with a predetermined depth; an isolation layer formed inside the trench and comprising a first insulating material; and a plurality of word lines formed on the isolation layer inside the trench and covering a sidewall of the active region inside the trench. A separation layer is formed between two neighboring word lines to separate the two neighboring word lines of the plurality of word lines inside the trench with a predetermined distance. The separation layer comprises a second insulating material having an etch selectivity with respect to the first insulating material.