Patent ID: 8227265

Claim:
A method of measuring a pattern shape of irradiating light onto an object pattern of a pattern-attached substrate and measuring a shape of the pattern on the pattern-attached substrate by a processing of an operation part based on reflected light or diffracted light of the irradiated light, the method comprising: a first step of creating a calculation model from a predicted shape of the object pattern on the pattern-attached substrate to be measured, and calculating calculated waveforms of reflected light or diffracted light obtained when irradiating light on the object pattern based on the calculation model; a second step of performing a simulation with sequentially changing shape parameters of the calculation model, creating a library from a plurality of calculated waveforms obtained from the simulation, and storing the library to a database; a third step of irradiating light onto the object pattern on the pattern-attached substrate to be measured, and obtaining a detected waveform from reflected light or diffracted light of the irradiated light; a fourth step of performing a matching of the library stored in the database and the detected waveform, and selecting a best-match calculated waveform; a fifth step of, when the best-match calculated waveform cannot be selected in the fourth step of selecting the best-match calculated waveform, setting at least one parameter among the shape parameters as a fixed value based on information obtained by another measurement apparatus that uses a measurement method independent to the first to fourth steps, performing the matching of the library and the detected waveform again, and selecting a best-match calculated waveform; and a sixth step of obtaining shape information of the object pattern from the best-match calculated waveform.