Patent ID: 8674421
Filing Date: 2014-03-18
Classification: H01L

Abstract:
1. A semiconductor device comprising: a first conductor formed over a semiconductor substrate; a first insulator formed over the first conductor; a second insulator formed over the first insulator, the second insulator having an etching characteristic different from an etching characteristic of the first insulator; a second conductor formed on the second insulator, the second conductor being in contact with the second insulator; a third insulator formed over the second conductor, the third insulator having an etching characteristic different from the etching characteristic of the second insulator; a first contact hole formed through the third insulator and the second conductor, the first contact hole reaching the second insulator; a third conductor formed in the first contact hole, wherein a side wall of the third conductor is in contact with a side wall of the second conductor, and the third conductor is electrically connected to the second conductor; a second contact hole formed through the third insulator and the first insulator, the second contact hole reaching the first conductor; and a fourth conductor formed in the second contact hole, wherein the fourth conductor is electrically connected to the first conductor.