Radiation imagery chemistry: process – composition – or product th – Including control feature responsive to a test or measurement
Patent
1997-07-09
1998-06-09
Young, Christopher G.
Radiation imagery chemistry: process, composition, or product th
Including control feature responsive to a test or measurement
430311, 430330, G03C 500, G03F 726
Patent
active
057631247
ABSTRACT:
A first correlation is obtained which is a correlation between latent image height produced after exposure on a resist layer, and resist pattern linewidth for a given length of develop time. Additionally, a second correlation is obtained which is a correlation between develop time for each exposure energy dose and resist pattern linewidth. The height of a latent image produced on an actually exposed resist layer is determined. From the first correlation, an estimated resist pattern linewidth, which is a resist pattern linewidth corresponding to a latent image height and to a given length of develop time, is found. From the second correlation, an estimated exposure energy dose, which is an exposure energy dose corresponding to a given length of develop time and to an estimated resist pattern linewidth, is found. Additionally, also from the second correlation, develop time corresponding to a target resist pattern linewidth and to an estimated exposure energy dose is found, and according to the develop time found, a resist pattern is formed.
REFERENCES:
patent: 4670650 (1987-06-01), Matsuzawa et al.
J. Sturtevant et al., "Use of Scatterometric Latent Image Detector in Closed Loop Feedback Control of Linewidth", SPIE vol. 2196, pp. 352-359.
Shoaib Zaidi et al., "Metrology sensors for advanced resists," SPIE vol. 2196, pp. 341-351.
John L. Sturtevant et al., "Post-exposure bake as a process-control parameter for chemically-amplified photoresist," SPIE vol. 1926, pp. 106-114.
Michael T. Postek, "Integrated Circuit Metrology, Inspection, and Process Control VII," 1926, pp. 107-114.
Koizumi Taichi
Matsuo Takahiro
Matsushita Electric - Industrial Co., Ltd.
Young Christopher G.
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