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Proceedings Paper

Efficient ozone, sulfate, and ammonium free resist stripping process
Author(s): Davide Dattilo; Uwe Dietze
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Paper Abstract

In recent years, photomask resist strip and cleaning technology development was substantially driven by the industry's need to prevent surface haze formation through the elimination of sulfuric acid and ammonium hydroxide from these processes. As a result, conventional SPM (H2SO4 + H2O2) was replaced with Ozone water (DIO3) for resist stripping and organic removal to eliminate chemical haze formation [1, 2]. However, it has been shown that DIO3 basted strip and clean process causes oxidative degradation of photomask materials [3, 4]. Such material damage can affect optical properties of funcitional mask layers, causeing CD line-width, phase, transmission and reflection changes, adversely affecting image transfer during the Lithography process. To overcome Ozone induced surface damage, SUSS MicroTec successfully developed a highly efficient strip process, where photolysis of DIO3 is leading to highly reactive hydroxyl radical formation, as the main contribution to hydrocarbon removal without surface damage [5]. This technology has been further extended to a final clean process, which is utilizing pure DI water for residual organic material removal during final clean [6]. Recently, SUS MicroTec did also successfully release strip and clean processes which completely remove NH4OH, eliminating any chemicals known today to induce haze [7]. In this paper we show the benefits of these new technologies for highly efficient sulfate and ammonium free stripping and cleaning processes.

Paper Details

Date Published: 28 July 2014
PDF: 8 pages
Proc. SPIE 9256, Photomask and Next-Generation Lithography Mask Technology XXI, 925604 (28 July 2014); doi: 10.1117/12.2070808
Show Author Affiliations
Davide Dattilo, SUSS MicroTec Photomask Equipment GmbH & Co. KG (Germany)
Uwe Dietze, SUSS MicroTec Inc. (United States)

Published in SPIE Proceedings Vol. 9256:
Photomask and Next-Generation Lithography Mask Technology XXI
Kokoro Kato, Editor(s)

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