Patent ID: 9644956
Date: 2017-05-09
CPC Classifications: G01B,G01N

Claim:
1. A method for measuring thickness of thin film using x-ray, the method comprising: detecting an intensity of a signal scattered by a special component included in a reference base layer of a first reference sample by irradiating x-ray to the reference base layer of the first reference sample; forming a reference thin film layer on a base layer of a second reference sample; detecting an intensity of a signal scattered by the special component included in the base layer of the second reference sample by irradiating x-ray to the reference thin film layer formed on the base layer of the second reference sample; measuring an actual thickness of the reference thin film layer formed on the base layer of the second reference sample using an electron microscope; determining a calibration line as a ratio of the intensity of the signal from the reference thin film layer relative to the intensity of the signal from the reference base layer of the first reference sample; wherein a y axis of the calibration line represents a ratio of intensities of signals respectively detected in the reference base layer irradiation step and the reference thin film layer irradiation step, and an x axis of the calibration line represents thickness of thin film layers measured by the electron microscope; detecting an intensity of a signal scattered by the special component included in a target base layer by irradiating x-ray to a target thin film layer formed on the base layer of a target sample; and determining a thickness of the target thin film layer of the target sample by calculating a target sample ratio between intensities of signals respectively detected from the target sample irradiation step and the reference base layer irradiation step, where the thickness of the target thin film layer of the target sample is the thickness corresponding to the target sample ratio along the calibration line; wherein the thickness of the target thin film layer is from 50 nm to 300 nm, wherein the reference thin film layer and the target thin film layer are formed with the same material, and wherein the reference base layer and the target base layer are formed with the same material.