A simple approach to sub-100 nm resist nanopatterns with a high aspect ratio

A simple methodology to prepare sub-100 nm resist nanopatterns with a high aspect ratio for the transfer of device nanofeatures is demonstrated. The novel method is based on a two- or multi-step developing process with the incorporation of an ∼4 nm thick metal film to protect the fine resist nanopatterns in the developer solution. Using this approach, sub-100 nm resist nanopatterns of different shapes were readily fabricated using the positive- and negative-tone electron-beam resists. Subsequently, fine device nanostructures could be readily converted from these fine resist nanopatterns with a high aspect ratio. (paper)