Patent Document ID: 7483560
Application ID: 10679290
Patent Status: 1

Claim One:
1. A method of measuring a three dimensional shape of a fine pattern formed on a substrate, comprising the steps of: obtaining height information about the fine pattern by measuring the substrate; obtaining electron beam image information about the fine pattern by imaging the substrate by means of an electron microscope; and measuring the three dimensional shape of the fine pattern by use of the height information and the electron beam image information; wherein the electron beam image information includes information of average slope angle of a side wall of the fine pattern, information of a ratio of bottom roundness of the fine pattern and information of a ratio of top roundness of the fine pattern; wherein the information of average slope angle of a sidewall of the fine pattern is quantified by using information of a first-order differential waveform of a signal detected by the electron microscope of an average slope angle tan −1 (H/E), where H is a height when a cross section is considered as a trapezoid and E is a width between a top and bottom of the slope when viewed from above the fine pattern, the information of the ratio of bottom roundness of the fine pattern is quantified by using information of a first-order differential waveform of the ratio of the bottom roundness B/H, where B is the width between a rising point corresponding to a bottom and a maximum point, and the information of the ratio of top roundness of the fine pattern is quantified by using information of a first-order differential waveform of the ratio of the top roundness T/H, where T is a distance between a minimum point and a starting point of a flat portion corresponding to the top of the electron beam image signal.