Patent ID: 6033721
Filing Date: 2000-03-07
Classification: C23C

Abstract:
A method for controlling a chemical vapor deposition process on a substrate having a surface characterized by a three dimensional topography, the method comprising,generating preset values for chemical vapor deposition process parameters including power, trajectory, and scan velocity of a laser beam for irradiating said substrate surface,acquiring one or more planar images during said controlling of said chemical vapor deposition process at a series of focal planes on the substrate surface by measuring light reflected from said substrate surface at each of said focal planes, wherein each of said planar images is normal to a common z-axis passing normal through the substrate surface and each of said focal planes is at a different height along said common z-axis,processing said planar images to determine measured topographical features of a segment of said substrate surface and generating a height map representative thereof, andprocessing said measured topographical features of said height map with said preset values to generate an updated value for at least one of said power, said trajectory, and said scan velocity of said laser beam in real time during said controlling of said chemical vapor deposition process and causing said deposition there.