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Related Concept Videos

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Contact-dependent signaling, as the name suggests, requires that communicating cells be in direct contact with each other. This is achieved either through receptor-ligand interactions or by specialized cytoplasmic channels that allow the flow of small molecules between cells. In animal cells, channels called gap junctions facilitate contact-dependent signaling in certain tissues, whereas, plasmodesmata perform a similar function in plants.
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Fabrication of Fine Electrodes on the Tip of Hypodermic Needle Using Photoresist Spray Coating and Flexible Photomask for Biomedical Applications
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Contact Photolithography at Sub-Micrometer Scale Using a Soft Photomask.

Chun-Ying Wu1, Heng Hsieh1, Yung-Chun Lee2

  • 1Department of Mechanical Engineering, National Cheng Kung University, Tainan 70101, Taiwan.

Micromachines
|August 21, 2019
PubMed
Summary

A novel soft polydimethylsiloxane (PDMS) photomask improves contact photolithography resolution to the sub-micrometer scale. This method enables high-pattern resolution for microfabrication applications.

Keywords:
black photoresistcontact photolithographysoft photomasksub-micrometer scaleultraviolet patterning

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Microfabrication

Background:

  • Conventional contact photolithography faces limitations in achieving sub-micrometer patterning resolution.
  • The development of advanced photomask technologies is crucial for next-generation microelectronic devices.

Purpose of the Study:

  • To propose and demonstrate a new method for enhancing photolithography patterning resolution.
  • To achieve sub-micrometer feature sizes using a novel soft photomask approach.

Main Methods:

  • Fabrication of a soft polydimethylsiloxane (PDMS) photomask replicated from a silicon mold.
  • Patterning the PDMS photomask with a black photoresist (PR) layer to selectively block ultraviolet (UV) light.
  • Utilizing the soft PDMS photomask for intimate contact photolithography on a PR-coated substrate.

Main Results:

  • Successful fabrication of the black-PR/PDMS soft photomask.
  • Achieved UV patterning with a minimum line-width of 170 nm over a 4-inch wafer area.
  • Demonstrated high pattern resolution capabilities of the soft photomask in contact photolithography.

Conclusions:

  • The developed black-PR/PDMS soft photomask effectively enhances contact photolithography resolution.
  • This technique offers a viable pathway for sub-micrometer patterning, with potential applications in advanced microfabrication.
  • The conformable nature of the soft mask ensures high fidelity pattern transfer.