Patent ID: 9613002
Date: 2017-04-04
CPC Classifications: G03F,G06F,H01L

Claim:
1. A method for calibrating target values of a wafer being processed, comprising: processing a wafer having a plurality of shot areas using initial data, wherein the initial data includes initial target values that include one of a vector for a wafer map, a table with numerical values for respective shot areas, coordinates for each shot area, or a set of polynomial regression coefficients for calculating coordinates of each shot area; measuring errors for each of the plurality of shot areas; calculating an error similarity of at least some of the plurality of shot areas as a function of a separation distance between each pair of some of the shot areas; selecting a first shot area and a plurality of second shot areas adjacent to the first shot area; calculating weight values for the second shot areas based on the error similarities between each pair of second shot areas and the error similarities between the first shot area and each second shot area; calculating an estimated error of the first shot area based on the measured errors of the second shot areas and the weight values for the second shot areas; generating estimated data based on the estimated errors for each of the plurality of shot areas; calculating calibrated data from differences between the estimated data and the initial data; and processing another wafer having a plurality of shot areas using the calibrated data.