Patent ID: 6617253
Filing Date: 2003-09-09
Classification: H01L

Abstract:
A plasma etching method, in which a dielectric film on a wafer is etched by plasma using a photoresist pattern as a mask, the method comprising:(a) plasma etching an upper portion of the dielectric film using the photoresist pattern as a mask by establishing an average power of a power supply within a given range, to form an opening the dielectric film; (b) selectively depositing a polymer layer on the photoresist pattern, the polymer layer having a thick portion on the surface of the photoresist pattern and a substantially thinner portion on the surface of the opening in the dielectric film; and (c) plasma etching the remaining portion of the dielectric film using the photoresist pattern and the polymer layer as a mask by establishing the average power of the power supply within the given range.