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Proceedings Paper

Development of new resist materials for 193-nm dry and immersion lithography
Author(s): Takashi Sasaki; Naoko Shirota; Yoko Takebe; Osamu Yokokoji
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Paper Abstract

We earlier developed new monocyclic fluoropolymers (FUGU) for F2 resist materials. But, it is necessary for FUGU to improve of their characteristics, especially the dry-etching resistance, in order to apply for ArF lithography at fine design rules. We have tried to combine FUGUs with Adamntyl methacrylates based conventional ArF resist polymer. In this paper, we have investigated the role of cyclic fluorinated unit, FUGU, in 193 nm resist polymers by analyzing the dissolution behavior. We found that FGEAM showed high sensitivity and good dissolution contrast, compared with acrylate based conventional samples at low PEB temperature (100oC). And this difference of sensitivity was clearly found when weak acidity PAGs were used. From the dissolution behaviors of FGEAM, FUGU unit can work to improve the resist sensitivity in acrylate based ArF resist polymers. And we also found that FGEAM showed long acid diffusion length on PEB process, compared with Conventional samples. These result show that FUGU unit has a unique characteristics of the sensitivity with 193nm exposure and the acid diffusion behavior. We also investigated a new series of fluorinated copolymers for 193-nm lithography, combination of FUGU monomer and acrylate units which are used in conventional ArF resist. Six ter-polymers of FUGU, combination of FUGU monomers and EAdMA, GBLMA and HAdMA were prepared. We found that FUGU ter-polymers had a good dry etching resistance keeping high transparency at 193nm. And FUGU ter-polymers showed high sensitivity toward 193nm exposure. FUGU ter-polymers also had a high hydrophobic properties compared conventional type ArF resist polymers. So we also expect FUGU ter-polymers to be useful for ArF dry and immersion lithography.

Paper Details

Date Published: 29 March 2006
PDF: 8 pages
Proc. SPIE 6153, Advances in Resist Technology and Processing XXIII, 61530E (29 March 2006); doi: 10.1117/12.656141
Show Author Affiliations
Takashi Sasaki, Asahi Glass Co., Ltd. (Japan)
Naoko Shirota, Asahi Glass Co., Ltd. (Japan)
Yoko Takebe, Asahi Glass Co., Ltd. (Japan)
Osamu Yokokoji, Asahi Glass Co., Ltd. (Japan)

Published in SPIE Proceedings Vol. 6153:
Advances in Resist Technology and Processing XXIII
Qinghuang Lin, Editor(s)

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