Patent ID: 7026252

Claim:
An etching aftertreatment method comprising: etching a sample having a laminated wiring structure including a Si-containing low permittivity insulating film with a halogen based gas, said etching leaving photoresist components, antireflection film components and halogen components on a surface of the Si-containing low permittivity insulating film; after said etching, introducing an oxygen gas or an oxygen gas with hydrogen gas to a processing chamber; generating plasma within the processing chamber having had said oxygen gas or said oxygen gas with hydrogen gas introduced thereto; simultaneously applying high frequency voltage to the sample; and exposing the sample to the plasma so as to remove the photoresist components, the antireflection film components and the halogen components from the surface of the Si-containing low permittivity insulating film, wherein the oxygen gas or the oxygen gas with the hydrogen gas introduced to the chamber as an aftertreatment gas has a flow rate between 5 cc and 20 cc/min, and pressure within the processing chamber after the introduction of the aftertreatment gas is between 0.2 Pa and 1 Pa, wherein a temperature of the sample is set between 50° C. and 200° C. according to which the Si-containing low permittivity insulating film will not be deteriorated, and wherein the high frequency voltage applied to the sample is set so that a wafer bias power ranges between 50 W and 200 W creating ion energy that will not deteriorate the Si-containing low permittivity insulating film.