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Proceedings Paper

Formulated surface conditioners to enhance the non-collapse window and maintain defect control: a bi-functional approach for sub-100-nm lithography
Author(s): Masakazu Sanada; Minoru Sugiyama; Manuel Jaramillo; Peng Zhang; Shawn Cassel
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Paper Abstract

One key challenge in sub-100 nm lithography is line pattern collapse. Pattern collapse has become an obstacle in device manufacturing processes requiring dense-high aspect ratio resist lines. In addition to pattern collapse, defect control continues to be a factor in IC manufacturing. In this study, the impact of a formulated surface conditioner, OptiPatten® Clear, with bifunctional capabilities: improved non-collapse window and defect control, was tested using a 193 nm lithographic process. To determine pattern collapse performance, 100 nm dense lines/space (L/S) and 100 nm 1:0.9 L/S were patterned into 240 nm of resist on 200 mm wafers. The wafers were then processed with developer and a formulated surface conditioner and compared to wafers processed with developer and DI water. When analyzed, wafers processed with surface conditioner had a 33% increase in Depth-of-Focus (DOF) and a 25% increase in Critical Normalized Aspect Ratio (CNAR) compared to DI water. Optical proximity effects are often credited for having a first-order influence on pattern collapse. Trench feature data was generated using an Scanning Electron Microscope (SEM) to compare the pattern collapse performance of OptiPattern Clear to DI water. The data strongly suggests optical proximity effects are a second-order factor which OptiPattern® Clear resolves. Defect performance for OptiPattern Clear was measured by comparison with a DI water baseline. A production reticle was used to process wafers patterned with 120 nm L/S with 240 nm of resist. The wafers processed with OptiPattern® Clear had similar defect performance as the DI water.

Paper Details

Date Published: 29 March 2006
PDF: 9 pages
Proc. SPIE 6153, Advances in Resist Technology and Processing XXIII, 615331 (29 March 2006); doi: 10.1117/12.656661
Show Author Affiliations
Masakazu Sanada, Dainippon Screen Manufacturing Co., Ltd. (Japan)
Minoru Sugiyama, Dainippon Screen Manufacturing Co., Ltd. (Japan)
Manuel Jaramillo, Air Products and Chemicals, Inc. (United States)
Peng Zhang, Air Products and Chemicals, Inc. (United States)
Shawn Cassel, Air Products and Chemicals, Inc. (United States)

Published in SPIE Proceedings Vol. 6153:
Advances in Resist Technology and Processing XXIII
Qinghuang Lin, Editor(s)

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