Mr. Anthony R. Vander Heyden Profile

Anthony R. Vander Heyden

Technical Account Manager at Contractor

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Proceedings Article | 23 June 2000 Paper

Negative-tone 193-nm resists

Sungseo Cho, Anthony Vander Heyden, Jeff Byers, C. Grant Willson

Proceedings Volume 3999, (2000) https://doi.org/10.1117/12.388343

KEYWORDS: Polymers, Lithography, Nitrogen, Liquids, Switches, Optical lithography, Absorbance, Chemistry, Modulation, Industrial chemicals

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A great deal of progress has been made in the design of single layer positive tone resists for 193 nm lithography. Commercial samples of such materials are now available from many vendors. The patterning of certain levels of devices profits from the use of negative tone resists. There have been several reports of work directed toward the design of negative tones resists for 193 nm exposure but, none have performed as well as the positive tone systems. Polymers with alicyclic structures in the backbone have emerged as excellent platforms from which to design positive tone resists for 193 nm exposure. We now report the adaptation of this class of polymers to the design of high performance negative tone 193 nm resists. New systems have been prepared that are based on a polarity switch mechanism for modulation of the dissolution rate. The systems are based on a polar, alicyclic polymer backbone that includes a monomer bearing a glycol pendant group that undergoes the acid catalyzed pinacol rearrangement upon exposure and bake to produce the corresponding less polar ketone. This monomer was copolymerized with maleic anhydride and a norbornene bearing a bis-trifluoromethylcarbinol. The rearrangement of the copolymer was monitored by FT-IR as a function of temperature. The synthesis of the norbornene monomers will be presented together with characterization of copolymers of these monomers with maleic anhydride. The lithographic performance of the new resist system will also be presented.

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