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Proceedings Paper

Development of an inorganic photoresist for DUV, EUV, and electron beam imaging
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Paper Abstract

The trend of ever decreasing feature sizes in subsequent lithography generations is paralleled by the need to reduce resist thickness to prevent pattern collapse. Thinner films limit the ability to transfer the pattern to the substrate during etch steps, obviating the need for a hardmask layer and thus increasing processing costs. For the 22 nm node, the critical aspect ratio will be less than 2:1, meaning 40-45 nm thick resists will be commonplace. To address this problem, we have developed new inorganic nanocomposite photoresists with significantly higher etch resistance than the usual polymer-based photoresists. Hafnium oxide nanoparticles are used as a core to build the inorganic nanocomposite into an imageable photoresist. During the sol-gel processing of nanoparticles, a variety of organic ligands can be used to control the surface chemistry of the final product. The different ligands on the surface of the nanoparticles give them unique properties, allowing these films to act as positive or negative tone photoresists for 193 nm or electron beam lithography. The development of such an inorganic resist can provide several advantages to conventional chemically amplified resist (CAR) systems. Beyond the etch resistance of the material, several other advantages exist, including improved depth of focus (DOF) and reduced line edge roughness (LER). This work will show etch data on a material that is ~3 times more etch-resistant than a PHOST standard. The refractive index of the resist at 193 nm is about 2.0, significantly improving the DOF. Imaging data, including cross-sections, will be shown for 60 nm lines/spaces (l/s) for 193 nm and e-beam lithography. Further, images and physical characteristics of the materials will be provided in both positive and negative tones for 193 nm and e-beam lithography.

Paper Details

Date Published: 25 March 2010
PDF: 10 pages
Proc. SPIE 7639, Advances in Resist Materials and Processing Technology XXVII, 76390E (25 March 2010); doi: 10.1117/12.846672
Show Author Affiliations
Markos Trikeriotis, Cornell Univ. (United States)
Woo Jin Bae, Cornell Univ. (United States)
Evan Schwartz, Cornell Univ. (United States)
Marie Krysak, Cornell Univ. (United States)
Neal Lafferty, Rochester Institute of Technology (United States)
Peng Xie, Rochester Institute of Technology (United States)
Bruce Smith, Rochester Institute of Technology (United States)
Paul A. Zimmerman, SEMATECH Inc. (United States)
Christopher K. Ober, Cornell Univ. (United States)
Emmanuel P. Giannelis, Cornell Univ. (United States)

Published in SPIE Proceedings Vol. 7639:
Advances in Resist Materials and Processing Technology XXVII
Robert D. Allen, Editor(s)

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