Patent ID: 6432835
Filing Date: 2002-08-13
Classification: H01L

Abstract:
A process for fabrication of a semiconductor integrated circuit device, comprising:forming a first film over a principal surface of a semiconductor wafer; forming a second film whose byproducts are more adherent to a sidewall upon etching than the first film and includes a platinum group member or an oxide containing a member of the platinum group; forming a third film over the second film; patterning the third film; etching the second film in a presence of the patterned third film, until appearance of the first film, the etching being in a presence of a gas having oxygen ions or oxygen radicals and under a condition of a gas residence time of 10 msec or less; and in a gas atmosphere, over etching the second film in an amount of at least 50%; wherein the oxygen ions or oxygen radicals are generated by plasma excitation of a mixed gas including a molecular gas containing an oxygen member and an additional gas, in a reduced-pressure atmosphere of from 100 mTorr to 0.1 mTorr.