Patent ID: 6214740
Filing Date: 2001-04-10
Classification: H01L

Abstract:
A dry-etching method, comprising:placing a halogen scavenger in a reaction chamber of a dry-etching apparatus using a plasma, the halogen scavenger having a surface on which tiny irregularities with an average roughness in a range between 1-1000 .mu.m are formed and being able to scavenge fluorine contained in the plasma;placing a substrate in the reaction chamber, the substrate having an oxide film and a resist film formed thereon; andcarrying out dry-etching of the oxide film formed on the substrate using a gas containing C and F,wherein the dry-etching is started directly after initial placement of the substrate in the reaction chamber after placing the halogen scavenger in the reaction chamber and is carried out under a condition in which a selectivity ratio of the oxide film etch rate against the resist film is below a standard value for carrying out the dry-etching stably.