Patent ID: 8685267
Filing Date: 2014-04-01
Classification: H01J,H01L

Abstract:
1. A substrate processing method performed by a substrate processing apparatus including a processing chamber for generating therein a plasma; a mounting table, provided in the processing chamber, for mounting thereon a substrate; and an electrode disposed to face the mounting table, the substrate processing method performing a plasma etching process on the substrate by applying to the processing chamber a first frequency power for generating plasma and applying to the mounting table a second frequency power for biasing, the second frequency power having a frequency lower than a frequency of the first frequency power, the substrate processing method comprising steps of: applying the first frequency power and the second frequency power in the pattern of a pulse wave, respectively; etching the substrate by positive ions in the plasma by applying both the first frequency power and the second frequency power; generating negative ions in the processing chamber by stopping the application of both the first frequency power and the second frequency power; and attracting the negative ions to the substrate by applying the second frequency power and stopping the application of the first frequency power, wherein a duty ratio of the second frequency power is set to be greater than a duty ratio of the first frequency power, the step of generating negative ions is started immediately upon completing the step of etching the substrate by positive ions by applying both the first frequency power and the second frequency power, and another step of etching the substrate by positive ions by applying both the first frequency power and the second frequency power is started immediately upon completing the step of attracting the negative ions to the substrate.