21 March 2016 Novel DDR process and materials for front-edge NTD process
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We developed the novel process and material which can prevent the pattern collapse issue perfectly. The process was Dry Development Rinse (DDR) process, and the material used in this process was DDR Material (DDRM). DDRM was containing siloxane polymer which could be replaced the space area of the photo resist pattern. And finally, the reversed pattern would be created by dry etching process without any pattern collapse issue.

This novel process was useful not only in positive tone development (PTD) process but also in negative tone development (NTD) process. We newly developed DDRM for NTD process. Novel DDRM consist of special polymer and it used organic solvent system. So, new DDRM showed no mixing property with NTD photo resist and it has enough etch selectivity against NTD photo resist.

Image reversal was successfully achieved by combination of NTD process and DDR process keeping good pattern quality. Tone reverse pattern below hp 18nm was obtained without any pattern collapse issue, which couldn’t be created by just using normal NTD process.
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Shuhei Shigaki, Shuhei Shigaki, Satoshi Takeda, Satoshi Takeda, Wataru Shibayama, Wataru Shibayama, Ryuji Onishi, Ryuji Onishi, Makoto Nakajima, Makoto Nakajima, Rikimaru Sakamoto, Rikimaru Sakamoto, "Novel DDR process and materials for front-edge NTD process", Proc. SPIE 9779, Advances in Patterning Materials and Processes XXXIII, 97790P (21 March 2016); doi: 10.1117/12.2218825; https://doi.org/10.1117/12.2218825

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