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Proceedings Paper

Effect of pattern density for contact windows in an attenuated phase shift mask
Author(s): Ikboum Hur; Ju-Hwan Kim; Il-Ho Lee; Hung-Eil Kim; Chang-Nam Ahn; Ki-Ho Baik; Soo-Han Choi
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Paper Abstract

An attenuated phase shift mask (PSM) is the most promising candidate for the high volume production lithography process among the various PSM types. It has been shown that attenuated PSM improves the lithographic performance such as depth of focus, especially in contact window by its edge enhancement. In this paper, the side lobe effect that restricts the lithographic performance of attenuated PSM and the light intensity distribution have been examined on changing the pattern density and the transmittance by experimental and simulation. The side lobe effect caused by proximity effect is very severe when pitch sizes are in the range of 0.7-0.9 micrometers for 0.35-0.45 micrometers contact hole on mask and it is enlarged by defocus exposure condition. The side lobe effect in this range of pitch size may forms the additional pattern in wafer, which restricts the application of attenuated PSM. The side lobe effect can be removed by additional pattern positioning at the center of four contact hole patterns, but simulation result of Exposure-Defocus tree (E-D tree) shows that lithographic performance of attenuated PSM is decreased by an auxiliary pattern. In the application of attenuated PSM in dense pattern, the relation between performance and side lobe effect is mutually contradictory.

Paper Details

Date Published: 26 May 1995
PDF: 12 pages
Proc. SPIE 2440, Optical/Laser Microlithography VIII, (26 May 1995); doi: 10.1117/12.209260
Show Author Affiliations
Ikboum Hur, Hyundai Electronics Industries Co., Ltd. (South Korea)
Ju-Hwan Kim, Hyundai Electronics Industries Co., Ltd. (South Korea)
Il-Ho Lee, Hyundai Electronics Industries Co., Ltd. (South Korea)
Hung-Eil Kim, Hyundai Electronics Industries Co., Ltd. (South Korea)
Chang-Nam Ahn, Hyundai Electronics Industries Co., Ltd. (South Korea)
Ki-Ho Baik, Hyundai Electronics Industries Co., Ltd. (South Korea)
Soo-Han Choi, Hyundai Electronics Industries Co., Ltd. (South Korea)


Published in SPIE Proceedings Vol. 2440:
Optical/Laser Microlithography VIII
Timothy A. Brunner, Editor(s)

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