Patent ID: 8243265

Claim:
A foreign material detecting method for detecting a foreign material attached to a substrate surface, the method comprising: a spraying step of spraying an organic solvent or an oil-phase material containing a halogen element to the substrate surface; a condensing step of emphasizing the foreign material by condensing the sprayed organic solvent or oil-phase material around the foreign material attached to the substrate surface by controlling a temperature of the substrate surface; a surface inspecting step of detecting the foreign material emphasized by the condensation of the organic solvent or the oil-phase material by a surface inspecting device; and a restoring step of scattering the condensed organic solvent or the condensed oil-phase material by heating the substrate surface after the surface inspecting step, wherein in the restoring step, the substrate is restored such that only the foreign material is attached thereon while the condensed organic solvent or the condensed oil-phase material is removed.