SURFACE TREATMENT METHOD, METHOD FOR PRODUCING SEMICONDUCTOR SUBSTRATE INCLUDING THE SURFACE TREATMENT METHOD, COMPOSITION FOR SURFACE TREATMENT, AND SYSTEM FOR PRODUCING SEMICONDUCTOR SUBSTRATE INCLUDING THE COMPOSITION FOR SURFACE TREATMENT
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United States of America Patent
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Issued Date -
Feb 16, 2023
app pub date -
Aug 4, 2022
filing date -
Aug 4, 2022
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Abstract
The present invention provides a means capable of sufficiently removing a residue containing inorganic oxide abrasive grains present on the surface of a polished object to be polished containing silicon nitride. One aspect of the present invention relates to a surface treatment method for reducing a residue containing inorganic oxide abrasive grains on a surface of a polished object to be polished containing silicon nitride using a composition for surface treatment, wherein the composition for surface treatment contains a zeta potential adjusting agent having a negatively charged functional group and having a viscosity of an aqueous solution having a concentration of 20% by mass at 25° C. of 10 mPa·s or more and a dispersing medium, and the surface treatment method includes controlling a zeta potential of the silicon nitride and a zeta potential of the inorganic oxide abrasive grains each to −30 mV or less using the composition for surface treatment.
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