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Line edge roughness after development in a positive-tone chemically amplified resist of post-optical lithography investigated by Monte Carlo simulation and a dissolution model

Akinori Saeki1,3, Takahiro Kozawa1, Seiichi Tagawa1,3, Heidi B Cao2, Hai Deng2 and Michael J Leeson2

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Line edge roughness (LER) of patterned features in chemically amplified (CA) resists is formed in the acid generation stage and expected to be moderated by the acid diffusion and development process. It is essential to obtain information on the limit of LER in order to realize next-generation lithographies such as electron beam or extreme ultraviolet. Here, we report for the first time a process simulator based on physical and chemical reaction mechanisms. The LER of a positive-tone CA resist after development is investigated by Monte Carlo simulation and Mack's dissolution model. We found that the LER (high frequency) of less than 1.2 nm is achievable, although the process conditions and material design for achieving such a small LER are strict.


PACS

81.16.Nd Nanolithography

82.30.-b Specific chemical reactions; reaction mechanisms

Subjects

Nanoscale science and low-D systems

Chemical physics and physical chemistry

Dates

Issue 1 (9 January 2008)

Received 9 May 2007, in final form 16 October 2007

Published 29 November 2007



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