Patent ID: 8519332

Claim:
A semiconductor inspecting apparatus, the apparatus comprising: a sample stage holding a circular sample, a surface of which being made of dielectric; a unit moving the sample stage; a beam source irradiating a charged particle beam on a surface of the sample; a beam scanning unit scanning the charged particle beam on the surface of the sample; a first attracting electrode installed within the dielectric; a second attracting electrode installed within the dielectric; a first attracting voltage supply source installed in order to apply voltage to the first attracting electrode; a second attracting voltage supply source having different polarity from that of the first attracting voltage supply source installed in order to apply voltage to the second attracting electrode; a ring-shaped potential correcting electrode installed at a position lower than a surface holding the sample of the sample stage; a correction voltage supply source applying voltage to the potential correcting electrode; an analyzer analyzing the voltage of the correction voltage supply source according to an inspecting position of the sample, a thickness of the sample and an irradiating condition of the charged particle beam; and a controller controlling the voltage of the correction voltage supply source based on an analysis result of the analyzer, wherein an outer edge of the first attracting electrode is at an inside from an inner edge of the second attracting electrode, an inner edge of the second attracting electrode is at an inside of an outer edge of the circular sample, an outer edge of the second attracting electrode is at an inside of the outer edge of the circular sample, an inner side of the potential correcting electrode is at an outside of the outer edge of the second attracting electrode, and an outer side of the potential correcting electrode is at the outside of the outer edge of the circular sample.