As lithographic techniques advance in their capabilities of shrinking microelectronics devices, the need for improved
resist materials, especially for extreme ultraviolet (EUV), has become increasingly pressing. In this work, we study the
molecular layer deposition (MLD) of an Al-based hybrid thin film resist, known as “alucone,” extending our previous
research that tested the Hf-based hybrid thin film “hafnicone” as an EUV resist. Alucone is grown at 100 ºC using the
metal precursor trimethylaluminum and the organic precursor ethylene glycol. Like hafnicone, alucone behaves as a
negative tone resist that can resolve 50-nm line widths, though preliminary data suggest that alucone’s line patterns are
more sharply defined than those of hafnicone. Whereas hafnicone’s sensitivity is 400 μC/cm2 using 3 M HCl as the
developer, alucone’s sensitivity is not yet as good (4800 μC/cm2 using 0.125 M HCl). Our study of alucone offers new
insight into structural features of an MLD film that can lead to desired EUV-responsive behavior. This insight may
accelerate the development of vapor-deposited inorganic resists for use in electron-beam and EUV lithography.
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