Patent ID: 6083844
Filing Date: 2000-07-04
Classification: H01L

Abstract:
A method for etching a substrate in a plasma processing chamber and providing a high oxide-to-TiN selectivity, said substrate having thereon a silicon dioxide-containing layer disposed above a TiN layer, said method comprising:positioning said substrate in said plasma processing chamber;flowing an echant source gas that includes CO, CHF.sub.3, neon and N.sub.2 into said plasma processing chamber, whereby a layer of titanium oxide is formed over the surface of the TiN layer by the reaction of the CO with the TiN, the titanium oxide contributing to the high oxide-to-TiN selectivity in association with the etchant source gas; andforming a plasma out of said etchant source gas within said plasma processing chamber to cause etching of said silicon-dioxide-containing layer.