Critical dimension (CD) control by spectrum metrology

摘要

A method for patterning a substrate includes forming a material layer on the substrate; performing a first etching on the material layer to form a pattern; measuring the pattern of the material layer using an optical spectrum metrology tool; determining whether the measuring indicates that the etching step achieved a predefined result; and producing an etching recipe and performing a second etching of the material layer using the etching recipe if the predefined result was not achieved.