Patent ID: 6525829
Filing Date: 2003-02-25
Classification: G01B

Abstract:
A method for measuring the thickness of a copper oxide film on a copper film, comprising:producing light that includes light of a specific wavelength; transmitting said light to said copper oxide film, such that some of said light is reflected, said reflected light including light of said specific wavelength; detecting a detected amount of said reflected light of said specific wavelength; determining the reflectivity of said copper oxide film using said detected amount; and determining the thickness of said copper oxide film using said reflectivity, wherein said reflectivity is measured in percent and said reflectivity is denoted by R, said copper oxide film comprises cuprous oxide (Cu2O), said thickness of said copper oxide film is measured in nanometers, said thickness of said copper oxide film is denoted by t, said thickness of said copper oxide film is less than about 15 nm, and wherein said thickness of said copper oxide film is determined using the following relationship: R=54.28âˆ’4.035tâˆ’0.1959t2+0.0164t3.