Patent ID: 7276450
Filing Date: 2007-10-02
Classification: H01L

Abstract:
1. A method of etching to expose a conductor, the method comprising: etching through a first dielectric layer including silicon dioxide (SiO etching through a cap layer including titanium nitride (TiN) using a chemistry including tetrafluoro methane (CF wherein the first dielectric layer etching includes using the following conditions: approximately 90-110 mTorr (mT) of pressure, an RF energy of approximately 950-1050 watts (W) at approximately 27 MHz at one electrode and at approximately 2 MHz at another electrode, and a gas flow of approximately 375-425 standard cubic centimeters (sccm) of argon (Ar), approximately 13-17 sccm of octafluorocyclobutane (C 4 F 8 ) and approximately 5-7 sccm of oxygen (O 2 ).