✦ LIBER ✦

On-line state and parameter Identification of positive photoresist development

✍ Scribed by Thomas A. Carroll; W. Fred Ramirez

Publisher: American Institute of Chemical Engineers
Year: 1990
Tongue: English
Weight: 623 KB
Volume: 36
Category: Article
ISSN: 0001-1541
DOI: 10.1002/aic.690360711

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✦ Synopsis

The development phase of the optical photolithography process has long been considered the most crucial, as it is the final image-forming step. Process monitoring methods have focused primarily on end point detection and have not used other inferable on-line information. This paper examines the use of mathematical models in conjunction with on-line development penetration data to determine process changes. An on-line sequential parameter identification scheme is used to calculate a current rate parameter value for the development model, and a Kalman filter is used to reduce erroneous observations caused by measurement noise. A powerful development monitor system results from the combination of real-time data, and on-line parameter and state estimation theory.

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