Patent ID: 8067285

Claim:
A method of forming a conductive layer structure, the method comprising: sequentially forming a first insulating layer and a first conductive layer on a substrate having a first region and a second region, and exposing the substrate in a recess-forming area in the first region; forming a recess in the recess-forming-area by etching the substrate that is exposed in the recess-forming area; conformally forming a second insulating layer on the first conductive layer and on a sidewall and a bottom of the recess, wherein the second insulating layer is formed of silicon oxide by a plasma oxidation process using at least one oxidizing agent including at least one of oxygen, nitric oxide (NO) and nitrous oxide (N 2 O) and at least one plasma generating gas including at least one of argon, helium and xenon; forming a second conductive layer pattern on the second insulating layer to fill up a portion of the recess; forming a spacer on the second conductive layer pattern and on the second insulating layer on the sidewall of the recess; and forming a third conductive layer pattern on the second conductive layer pattern and the spacer to fill up the recess.