Macronix International Co., Ltd.

Ding-Chien Chien

Chih-Chia Hsu

Tsung-Han Peng

Chung-Hsin Liu

A method for monitoring overlay alignment on a wafer that includes identifying a target machine, identifying a target process, identifying a plurality of critical layers, obtaining a plurality of overlay data from at least one of designated registration patterns on the wafer as baseline data, providing a plurality of reference overlay data, correlating the plurality of the reference overlay data with the baseline data to obtain overlay error, comparing the overlay error with specifications of the target machine, accepting the baseline data when the overlay error is within the specifications, and performing overlay alignment monitoring with the baseline data.

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Hsinchu, Taiwan

Ding-Chien Chien