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9 July 2015 Photoresist cross-sectional shape change caused by scanning electron microscope-induced shrinkage
Takeyoshi Ohashi, Tomoko Sekiguchi, Atsuko Yamaguchi, Junichi Tanaka, Hiroki Kawada
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Journal of Micro/Nanolithography, MEMS, and MOEMS, Vol. 14, Issue 3, 034001 (July 2015). https://doi.org/10.1117/1.JMM.14.3.034001
Abstract
Change in the cross-sectional profile of a photoresist (PR) pattern due to shrinkage was evaluated to investigate the mechanism of electron beam-induced shrinkage. A scanning transmission electron microscope (STEM) was used to observe the cross-sectional profiles of PR lines after atomic-layer deposition of metal oxide and carbon deposition on the sample surface. A HfO2 thin layer enhanced the profile contrast in the STEM measurements without blurring the edge, which enabled the precise cross-sectional measurement of the PR patterns. We found interesting features associated with shrinkage from the detailed profile change obtained using this method, such as a rounding of the pattern top, a necking of the sidewall profile, a rounding of the foot in the pattern on the organic underlying layer, and voltage-independent sidewall shrinkage under a large electron beam dose. These behaviors along with the results from a Monte Carlo simulation are discussed. Consequently, these observations experimentally clarified that the elastic deformation effect and the impact of the secondary electrons emitted from the spaces around the pattern into the sidewall are important to interpret the change in the shape of the pattern induced by shrinkage.
CC BY: © The Authors. Published by SPIE under a Creative Commons Attribution 4.0 Unported License. Distribution or reproduction of this work in whole or in part requires full attribution of the original publication, including its DOI.
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Takeyoshi Ohashi, Tomoko Sekiguchi, Atsuko Yamaguchi, Junichi Tanaka, and Hiroki Kawada "Photoresist cross-sectional shape change caused by scanning electron microscope-induced shrinkage," Journal of Micro/Nanolithography, MEMS, and MOEMS 14(3), 034001 (9 July 2015). https://doi.org/10.1117/1.JMM.14.3.034001
Published: 9 July 2015
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Cited by 10 scholarly publications and 1 patent.
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KEYWORDS
Scanning electron microscopy
Scanning transmission electron microscopy
Photoresist materials
Atomic layer deposition
Hybrid fiber optics
Monte Carlo methods
Selenium
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