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Proceedings Paper

Control of acidity of the substrate for precise pattern fabrication using a chemically amplified resist
Author(s): Isao Satou; Sachiko Yabe; Minoru Watanabe; Takashi Taguchi
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Paper Abstract

The chemically amplified (CA) resist has been widely and generally used for sub-quarter micron device fabrication using a KrF excimer laser stepper. However many problems have been revealed and laborious efforts have been seriously undertaken to solve them. Among these issues, we have been examining the dependence of the resist characteristics on the substrate properties. In order to control and minimize the fluctuation of the critical dimension, we have been evaluating the relation between the cleanliness of the substrate materials and the CA resist patterning characteristics, especially, we have been focusing on the effect of a wet cleaning process-step which is a necessary and important process-step for actual device manufacturing. Among the several materials which we evaluated, we found that the characteristics of an amorphous carbon(a-C) film used as an anti-reflective coating were significantly affected and changed by the sulfuric acid and hydroperoxide mixture (SPM) cleaning. For the other materials, no characteristic changes in the cause of this SPM cleaning were observed, and this cleaning method was effective and applicable to almost materials except the a-C film. In case of the a-C film, the acidic residue remained after the cleaning, and this contamination changed the acidity of the film. The resist patterning characteristics fabricated on the contaminated film were drastically changed, and pattern collapse occurred. In order to diminish this remaining contamination and control the acidity of the contaminated substrate, we tried to apply a high temperature treatment, an alkaline treatment and a UV cure treatment.

Paper Details

Date Published: 29 June 1998
PDF: 10 pages
Proc. SPIE 3333, Advances in Resist Technology and Processing XV, (29 June 1998); doi: 10.1117/12.312430
Show Author Affiliations
Isao Satou, Oki Electric Industry Co., Ltd. (Japan)
Sachiko Yabe, Oki Electric Industry Co., Ltd. (Japan)
Minoru Watanabe, Oki Electric Industry Co., Ltd. (Japan)
Takashi Taguchi, Oki Electric Industry Co., Ltd. (Japan)

Published in SPIE Proceedings Vol. 3333:
Advances in Resist Technology and Processing XV
Will Conley, Editor(s)

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