27 March 2014 Spin-on organic hardmask for topo-patterned substrate
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Carbon rich hard mask underlayer (UL) material deposition has become inevitable process in all advanced lithography applications. UL processes which include chemical vapor deposition (CVD) and spin-on UL play a very important role for pattern transfer from patterned thin photoresist to the substrate. UL materials must satisfy several requirements, which have become more demanding with device shrinkage and increasing device complexity (FinFET, 3D integration). The most important properties of next generation UL materials are superior wiggle resistance, etch controllability, thermal resistance, planarization, and gap filling performance. In particular, planarization and gap fill properties of UL material for application on topo-patterned substrate are receiving much attention recently. CVD processes generally give better wiggle performance and thermal resistance, but poorer planarization and gap filling performance than spin-on UL processes. In addition, Cost of Ownership (CoO) of CVD process is higher than that of a spin-on UL process. Therefore spin-on organic hard mask (OHM) process has been investigated as an attractive alternative to CVD processing. In this paper, we focus on an investigation of key properties of spin-on UL materials for achieving good planarity and gap filling performance on topo-patterned substrate. Various material properties such as solution viscosity, glass transition temperature (Tg), and film shrinkage ratio were evaluated and correlations between these properties and planarization were discussed.
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Kazuhiko Komura, Kazuhiko Komura, Yoshi Hishiro, Yoshi Hishiro, Goji Wakamatsu, Goji Wakamatsu, Yoshio Takimoto, Yoshio Takimoto, Tomoki Nagai, Tomoki Nagai, Tooru Kimura, Tooru Kimura, Yoshikazu Yamaguchi, Yoshikazu Yamaguchi, Tsutomu Shimokawa, Tsutomu Shimokawa, Greg Breyta, Greg Breyta, Noel Arellano, Noel Arellano, Srinivasan Balakrishnan, Srinivasan Balakrishnan, Luisa D. Bozano, Luisa D. Bozano, Ananthakrishnan Sankaranarayanan, Ananthakrishnan Sankaranarayanan, Krishna M. Bajjuri, Krishna M. Bajjuri, Daniel P. Sanders, Daniel P. Sanders, Carl E. Larson, Carl E. Larson, Anuja DeSilva, Anuja DeSilva, Martin Glodde, Martin Glodde, "Spin-on organic hardmask for topo-patterned substrate", Proc. SPIE 9051, Advances in Patterning Materials and Processes XXXI, 905115 (27 March 2014); doi: 10.1117/12.2046357; https://doi.org/10.1117/12.2046357

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