Patent ID: 8116894
Filing Date: 2012-02-14
Classification: B24B,H01L

Abstract:
1. A chemical mechanical polishing method for performing a flattening process on an interlayer insulating film, comprising: a step of forming a plurality of interlayer insulating films so as to coat a plurality of sets of projecting patterns, at least one of the plurality of sets of projecting patterns being formed on each of a plurality of substrates, whereby each of the plurality of sets of projecting patterns has a different area ratio R with respect to a respective one of the plurality of substrates, and performing a flattening process by polishing each of the interlayer insulating films coating the plurality of sets of projecting patterns; subsequent to performing the flattening process by polishing each of the interlayer insulating films, a step of obtaining a linear approximation formula R=aT+b expressing a relationship between the area ratio R and a polishing time T, where R a step of calculating, with the use of a formula T=(R−b)/a, values of a and b being obtained from the step of obtaining the linear approximation formula, the polishing time T for a particular interlayer insulating film coating a particular set of projecting patterns having a particular area ratio R, wherein each of the plurality of sets of projecting patterns has a plurality of individual projecting patterns having different thicknesses with respect to the respective one of the plurality of substrates; D wherein the particular area ratio R of the particular set of projecting patterns is calculated with the use of a formula R=D