Patent ID: 7758761
Filing Date: 2010-07-20
Classification: C23F,G02B

Abstract:
1. A dry etching method of etching using a dry etching system having a reaction chamber with a gas inlet, the method comprising: dry etching a substance including tungsten and carbon by using plasma generated from a mixed gas of a gas including fluorine and a gas including a carbon-nitrogen bond and hydrogen in the reaction chamber, wherein: the substance is a substrate or a layer each made of a tungsten-carbon alloy or a material in which a total composition ratio of tungsten and carbon is 50 atomic percent or more, the gas including fluorine and the gas including a carbon-nitrogen bond and hydrogen are supplied from the gas inlet to the reaction chamber, and said gas including a carbon-nitrogen bond and hydrogen includes alkylamine, dialkylamine, trialkylamine or a mixture of two or more thereof.