Patent ID: 6493070
Filing Date: 2002-12-10
Classification: G01N

Abstract:
A method for in-situ monitoring layer uniformity of sputter coating based on intensity distribution of plasma spectrum, wherein the sputter coating is deposited on a surface of a substrate inside a reaction chamber having a target opposite to said substrate and a low pressure working gas therein, which comprises the following steps:a) measuring intensity of plasma emission light along an axis on a surface parallel to said target, wherein said plasma emission light is generated by sputtering said target; b) splitting said intensity of plasma emission light to obtain an intensity distribution of a predetermined wavelength of an element constituting said target along said axis and an intensity distribution of a wavelength of said working gas adjacent to said predetermined wavelength along said axis; c) normalizing said intensity distribution of said predetermined wavelength of said element with said intensity distribution of said adjacent wavelength of said working gas to obtain a normalized intensity distribution; and d) comparing said normalized distribution with a standard normalized distribution of an uniform sputter coating obtained according to steps a), b) and c) in advance, so that the layer uniformity of said sputter coating deposited on said surface of said substrate is in-situ monitored, wherein said uniform sputter coating has a desired layer uniformity directly measured by an instrument, and is deposited under sputtering conditions same as those of said sputter coating under in-situ monitoring.