Patent ID: 7517468
Filing Date: 2009-04-14
Classification: H01L

Abstract:
1. A method of etching, by a plasma of an etching gas in a processing vessel, a lower layer film of an organic material formed on a substrate, using an upper layer film of an Si-containing organic material as a mask, wherein a mixed gas containing an NH a CD shift value of etching is controlled by adjusting a flow ratio of the O the plasma is formed between a pair of opposed electrodes disposed in the processing vessel, and a residence time represented by V/S takes a value from 20 to 60 msec, where V (m wherein the etching method is carried out by a capacitively coupled plasma etching system, which forms a high-frequency electric field between a pair of opposed electrodes disposed in the processing vessel to generate the plasma; and further wherein the distance between the electrodes is such that a distance between a first of said electrodes and a wafer disposed on a second of said electrodes is from 30 to 90 mm.