Patent ID: 8963070
Filing Date: 2015-02-24
Classification: G01J,G01N

Abstract:
1. A method for measuring carbon concentration in polycrystalline silicon comprising: slicing out a polycrystalline silicon plate from a polycrystalline silicon rod; mirror-polishing both surfaces of the polycrystalline silicon plate to reduce the polycrystalline silicon plate to thickness of 2.12±0.01 mm; creating a calibration curve according to an infrared absorption spectroscopy and on the basis of a standard measurement method using a single crystal silicon standard sample having known substitutional carbon concentration and thickness of 2.00±0.01 mm; calculating, under conditions same as conditions during the calibration curve creation, an infrared absorption spectrum in a frequency domain including an absorption zone peak of substitutional carbon in a desired place of the polycrystalline silicon plate after the mirror polishing; and calculating substitutional carbon concentration of the polycrystalline silicon plate on the basis of the calibration curve without performing thickness correction.