Patent ID: 8492287
Filing Date: 2013-07-23
Classification: H01L

Abstract:
1. A substrate processing method comprising: (a) placing a substrate in a processing vessel, the substrate having thereon a stacked film structure, the structure including a wiring layer, a silicon and carbon containing film formed on the wiring layer, and an insulating film containing silicon formed over the silicon and carbon containing film, the insulating film having therein a recess; (b) supplying a first gas containing carbon and fluorine in a processing vessel, generating a first plasma from the first gas, and etching the silicon and carbon containing film down to the wiring layer by the first plasma thereby forming a recess in the silicon and carbon containing film and also depositing a CF series polymer in the recess; and (c) supplying a second gas containing only nitrogen and hydrogen in a processing vessel, generating a second plasma from the second gas, and removing the CF series polymer by the second plasma, and also forming a compound containing fluorine, silicon, nitrogen and hydrogen on the substrate; and (d) heating the substrate at a temperature not less than 100° C. and not less than decomposition temperature of the compound, thereby decomposing the compound and removing the compound from the substrate.