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Proceedings Paper

Optimization of developing uniformity by resist thickness measurement
Author(s): Wenzhan Zhou; Luke Kok Chin Ng; Carol Yap
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Paper Abstract

As critical-dimension (CD) shrink below 0.18um, CD control becomes a major concern. Normally there are four approaches to improve CD control: to improve intra-field, intra-wafer, inter-wafer and inter-lot CD uniformity. In this paper, we propose a simple method to improve intra-wafer CD uniformity by optimize developing recipe. In DUV photolithography, intra-wafer CD variation is the major contributor to the overall CD variations. However there are many factors that may impact intra-wafer CD uniformity: Photoresist thickness uniformity, PEB uniformity, wafer surface roughness, substrate reflectivity and developing uniformity, so the situation become very complicated. In our studies, we tried to focus mainly on the developing uniformity of DUV process. To isolate the impact of developing method from other process factors, we proposed a simple method to check developing rate (Rmin) uniformity by photoresist thickness measurement. With this method, we had save a lot of time and manpower in developing recipe tuning and also had a deeper understanding of developing process of DUV resist.

Paper Details

Date Published: 2 June 2003
PDF: 6 pages
Proc. SPIE 5038, Metrology, Inspection, and Process Control for Microlithography XVII, (2 June 2003); doi: 10.1117/12.483431
Show Author Affiliations
Wenzhan Zhou, Chartered Semiconductor Manufacturing, Ltd. (Singapore)
Luke Kok Chin Ng, Chartered Semiconductor Manufacturing, Ltd. (Singapore)
Carol Yap, Chartered Semiconductor Manufacturing, Ltd. (Singapore)

Published in SPIE Proceedings Vol. 5038:
Metrology, Inspection, and Process Control for Microlithography XVII
Daniel J. Herr, Editor(s)

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