Patent ID: 6136722
Filing Date: 2000-10-24
Classification: H01L

Abstract:
A plasma etching method for forming a penetrating hole as small as approximately 0.3 .mu.m or less in a doped or undoped silicon dioxide film, which is comprised of a step of forming a masking film with a window on a silicon dioxide film to be etched, and a step of selectively etching said silicon dioxide film through said window of said masking film using a fluorocarbon-based etching gas and a plasma in a reaction chamber, thereby forming a penetrating hole in said silicon dioxide film;characterized in that during the step of selectively etching said silicon dioxide film, an etching condition is adjusted in such a way that a fluorocarbon polymer film having a ratio of carbon to fluorine ranging from 1.1 to 1.8 is deposited on said masking film.