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Journal of Micro/Nanolithography, MEMS, and MOEMS

Defect reduction for semiconductor memory applications using jet and flash imprint lithography
Author(s): Zhengmao Ye; Kang Luo; Xiaoming Lu; Brian Fletcher; Weijun Liu; Frank Y. Xu; Dwayne L. LaBrake; Douglas J. Resnick; S. V. Sreenivasan
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Paper Abstract

Acceptance of imprint lithography for manufacturing will require demonstration that it can attain defect levels commensurate with the defect specifications of high-end memory devices. Defects occurring during imprinting can generally be broken into two categories; random defects and repeating defects. Examples of random defects include fluid phase imprint defects, such as bubbles, and solid phase imprint defects, such as line collapse. Examples of repeater defects include mask fabrication defects and particle induced defects. Previous studies indicated that soft particles cause nonrepeating defects. Hard particles, on the other hand, can cause either permanent resist plugging or mask damage. In a previous study, two specific defect types were examined; random nonfill defects occurring during the resist filling process and repeater defects caused by interactions with particles on the substrate. We attempted to identify the different types of imprint defect types using a mask with line/space patterns at dimensions as small as 26 nm. An Imprio 500 twenty-wafer per hour development tool was used to study the various defect types. The imprint defect density was reduced nearly four orders of magnitude, down to ~ 4/cm2 in a period of two years following the availability of low defect imprint masks at 26-nm half-pitch. This reduction was achieved by identifying the root cause of various defects and then taking the appropriate corrective action.

Paper Details

Date Published: 22 August 2012
PDF: 6 pages
J. Micro/Nanolith. MEMS MOEMS 11(3) 031404 doi: 10.1117/1.JMM.11.3.031404
Published in: Journal of Micro/Nanolithography, MEMS, and MOEMS Volume 11, Issue 3
Show Author Affiliations
Zhengmao Ye, Molecular Imprints, Inc. (United States)
Kang Luo, Molecular Imprints, Inc. (United States)
Xiaoming Lu, Molecular Imprints, Inc. (United States)
Brian Fletcher, Molecular Imprints, Inc. (United States)
Weijun Liu, Molecular Imprints, Inc. (United States)
Frank Y. Xu, Molecular Imprints, Inc. (United States)
Dwayne L. LaBrake, Molecular Imprints, Inc. (United States)
Douglas J. Resnick, Molecular Imprints, Inc. (United States)
S. V. Sreenivasan, Molecular Imprints, Inc. (United States)

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