A unique pattering strategy based on 'resist nanokirigami'

A unique pattering strategy based on resist nanokirigami
(a-d) and (i-l) Multiscale metal micro-nano positive-type structures with sharp features or extremely small gaps; (e-f) and (m-p) the corresponding inverse metallic structures after lift-off. All scalebars: 1 µm. Credit: Science China Press

Photoresist-based patterning strategies have been standardized for decades since the invention of photolithography. However, there are still major challenges in the processing of certain functional structures. For example, the standard resist-based high resolution patterning process usually requires point-by-point exposure of the target resist structures, leading to extremely low throughput and an unavoidable proximity effect when defining multiscale patterns; high-energy beam irradiation can easily cause damage to the materials; and the negative-tone-resist-based lift-off process is challenging.

Recently, the journal National Science Review published the results of Professor Duan Huigao's research group from Hunan University. The team proposed and demonstrated a new resist patterning strategy, called "resist nano-kirigami." The outline of the target structure is exposed on the resist, and the excess resist film is selectively mechanically stripped. Compared with traditional electron , this scheme has the following core advantages:

  1. It can effectively reduce the exposure area in the (for example, for a disk structure with a radius of 400 µm, the exposure area of this scheme can be reduced by five orders of magnitude compared to the traditional electron beam lithography strategy), which greatly improves the processing efficiency and achieves efficient fabrication of cross-scale "macro-micro-nano" complex functional structures that are difficult to achieve by traditional solutions.
  2. Only the outlines of the target structure in the positive resist PMMA are exposed; both the positive- and negative-tone can be obtained by selective peeling of the PMMA.

The strategy provides a new solution that expands the family of lithography techniques and will play a significant role in fabricating multiscale functional structures.

More information: Qing Liu et al, Resist nanokirigami for multipurpose patterning, National Science Review (2021). DOI: 10.1093/nsr/nwab231

Citation: A unique pattering strategy based on 'resist nanokirigami' (2022, March 16) retrieved 9 December 2022 from https://phys.org/news/2022-03-unique-pattering-strategy-based-resist.html
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