Micro-scale Assembly and Patterning Process

  • Microparticle assembly

 Microparticle assembly has an effective meaning to the both research and industrial field. Via simple rubbing process, microscale-powders can easily form high crystallinity of monolayer over large area. This assembly has special optical properties, such as photonic crystal. The reflected light color varies depending on the crystal orientation of the particle assembly. In addition, the position registry and the deformability are guaranteed with the physical/ chemical patterning on the substrate. Due to these things the microparticle assembly can be suggested as one of the methodologies of the stretchable devices that are being actively developed by the electronics companies around the world.

Position-registered Microparticle assembly 

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ACS Appl. Mater. Interfaces, 2016, 8, 28149-28158

Adv. Mater., 2014, 26, 4633-4638

  • Patterning process development

 Patterning process is a crucial technology for device fabrication and is used in a variety way as well. Integrating circuit for stretchable electronics requires reliable and efficient patterning process, so in our lab, we are developing nozzle printing and screen printing process with conductive ink. Controlling characteristics of the ink solution is a key for the process development. Additionally, we produce partterns by capillary force lithography, nano-imprinting, and photolithography, etc. Furthermore, we can use assembled particle monolayer for patterning masks.

Nozzle printing of metal precursor

Microfabrication of PDMS pillar

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Microimprint of viscoelastic PEDOT:PSS

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Adv. Mater., 2017, 29, 1702625

Nano Energy, 2017, 34, 233-241

Adv. Mater., 2016, 28, 4455-4461