Patent ID: 8187980
Filing Date: 2012-05-29
Classification: H01J,H01L

Abstract:
1. An etching method for forming a groove by etching a silicon layer of a substrate by using a mask which has a first region where an opening with a first opening width is formed and a second region where an opening with a second opening width larger than the first opening width is formed, the method comprising: mounting the substrate on a mounting table in a processing chamber; converting a processing gas containing Cl etching the silicon layer by the plasma to thereby make substantially identical sidewall tilt angles of protruded portions between grooves in a first and a second etched region respectively corresponding to the first and the second region of the mask, wherein a flow rate of one of the CO gas and the CO wherein the mask is patterned such that a ratio of the second opening width to the first opening width is about 6 or more.