Patent ID: 6708559
Filing Date: 2004-03-23
Classification: G01G,G01N,H01L

Abstract:
A method for measuring recess depth in a semiconductor wafer through use of a solvent, comprising:a) placing a recessed wafer into a track; b) pouring a solvent into the wafer; c) commencement of spinning the track-wafer-solvent to recess said solvent into the wafer trench solvent; d) subjecting the track-wafer-solvent from step c) to a subsequent spinning step to spin-off any remaining solvent on the surface of said wafer to leave the wafer trench filled with solvent; e) weighing the solvent-filled-trench wafer; f) subjecting the solvent-filled-trench wafer to heating to remove said solvent; and g) weighing the solvent-free water to determine the difference in weight, and using the density of the solvent together with the difference in weight to determine the recess depth.