Patent ID: 9496150
Filing Date: 2016-11-15
CPC Classification: H01J,H01L

Claim Text:
1. An etching processing method for performing an etching process on a substrate mounted on a mounting table, the substrate having an etching target film and a mask film formed thereon, by using a substrate processing apparatus including a processing space where a plasma is generated, the mounting table provided in the processing space, an electrode disposed in the processing space to face the mounting table, a first high frequency power supply for supplying a first high frequency power into the processing space, a second high frequency power supply for supplying to the mounting table a second high frequency power having a frequency lower than a frequency of the first high frequency power, and a DC power supply for supplying a DC power to the electrode, the etching processing method comprising: a target film etching step for plasma-etching the etching target film by using the mask film, wherein, in the target film etching step, the DC power is applied to the electrode and the second high frequency power is applied to the mounting table in a pulse wave form that alternates between two consecutive intervals in which a periodic waveform includes a first power level applied during a first interval of the two consecutive intervals, and a second power level lower than the first power level and greater than or equal to zero is applied during a second interval of the two consecutive intervals, and wherein a total duration of the second interval is longer than a period of the periodic waveform during the first interval, and wherein a peak power of the periodic waveform in the first interval is greater than a peak power in the second interval.