Patent ID: 9396911
Filing Date: 2016-07-19
CPC Classification: H01J,H01L

Claim Text:
1. A determining method for determining a replacement time of a focus ring that surrounds a substrate to increase uniformity of a pattern in a surface of the substrate when the pattern is formed by etching a film on the substrate, the determining method comprising: measuring a shape or a critical dimension of the pattern; calculating a deviation in at least one parameter including one or more of TCD (top critical dimension), BCD (bottom critical dimension), Height (a height of a line formed by etching or a depth of a groove of the pattern), MCD (an average of TCD and BCD) and SWA (side wall angle) from data on the measured shape or the measured critical dimension; and determining the replacement time of the focus ring based on the calculated deviation in the at least one parameter when the deviation in the at least one parameter is greater than a predetermined critical value.