Patent ID: 8055366

Claim:
A simulation model creating method comprising: computing, for measurement results of a pattern line width of a resist pattern formed by transferring a pattern of a mask onto a wafer with an exposure amount and a focus value varied, a first permissible fluctuation range of the pattern line width from a distribution of the exposure amount and a distribution of the focus value; computing a function which is a polynomial including the exposure amount and focus value as parameters and fits the measurement results of the pattern line width, and computing difference values between measurement values of the measurement results and corresponding approximation values from the function as first differences; comparing the first difference with the first permissible fluctuation range for each measurement value, and, if the first difference exceeds the first permissible fluctuation range, deleting the measurement value and then, until the first difference is less than the first permissible fluctuation range, repeating computation of a function which fits post-deletion measurement results, comparison of the first difference and the first permissible fluctuation range for a new measurement value, and deletion of the new measurement value if the first difference exceeds the first permissible fluctuation range; computing a second permissible fluctuation range for the pattern line width of the resist pattern from an average value and a distribution of a pattern line width of the mask; executing lithography simulation for the mask using a simulation model created based on the measurement results, and computing predicted line widths of a pattern to be formed on a wafer; computing, as second differences, difference values between the measurement values of the measurement results and the predicted line widths; and comparing the second difference with the second permissible fluctuation range for each measurement value, and, if the second difference exceeds the permissible fluctuation range, deleting the measurement value and creating a simulation model based on the post-deletion measurement results.