Patent ID: 6815236
Filing Date: 2004-11-09
Classification: G01N

Abstract:
A method of measuring a concentration of a material comprising:irradiating an infrared light onto a semiconductor substrate having a layer formed thereon, the layer including a first material and a plurality of dopants of which an entire intensity is less than an intensity of the first material, wherein a portion of the infrared light is absorbed in the semiconductor substrate including the layer and a remaining portion of the infrared light is transmitted through the semiconductor substrate including the layer; computing intensities of the infrared light absorbed in the first material and the plurality of dopants in accordance with light wave numbers by utilizing a difference between an entire intensity of the infrared light and an intensity of the infrared light transmitted through the semiconductor substrate including the layer and by utilizing a difference between an entire intensity of the infrared light absorbed in the semiconductor substrate including the layer and an intensity of the infrared light absorbed in only the semiconductor substrate; observing light wave number regions respectively corresponding to predetermined intensities of the infrared light absorbed in the first material and the plurality of dopants among all the light wave number regions absorbed in the first material and the plurality of dopants; and obtaining concentrations of each of the plurality of dopants by utilizing a ratio of the light wave number regions corresponding to the predetermined intensities of the infrared light absorbed in each of the dopants with respect to the light wave number region corresponding to the predetermined intensity of the infrared light absorbed in the first material.