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Research

Research Fields

Flexible optoelectronics
Self-powered energy
Flexible drug delivery
Laser-material interaction
Flexible LSI & Memristor
Flexible Piezo Sensor

 

      Light-induced flexible electrodes

 Light-induced heating has been spotlightedas a new technology for the flexible electrode fabrication because the ability to heat locally, selectively, and rapidly has provided major increases in control, speed and energy efficiency, which can realize facile fabrication of high performance conductors on plastic substrate. We have developed the excellent performance flexible electrodes fabricated by light-induced plasmonic interactions of nanomaterials based on theoretical investigations of various photothermal properties for various applications such as energy harvester, touch screen panel, and memory. The proposed researches and theoretical investigations can provide the important technical and scientific solutions and guide lines for the light processing design toward industrial commercialization of next-generation flexible electronics.

  • Related References

"Plasmonic-Tuned Flash Cu Nanowelding for Ultrafast Photochemical-Reducing and Interlocking on Flexible Plastics" Adv. Funct. Mater., 10.1002/adfm.201701138 PDF [IF=12.1]

"Flash-Induced Self-Limited Plasmonic Welding of Silver Nanowire Network for Transparent Flexible Energy Harvester" Adv. Mater., 29, 1603473, 2017, PDF [IF=19.8]

  Laser-induced process for flexible electronics

      

       Laser is one of the most useful tools for solving  the temperature issues of flexible substrates (only enduring 100 Celcius for PET), which hinders high performance flexible electronics and materials. Laser can focus high thermal energy to a localized region in extremely short time (nsec ~ •žsec) while minimizing thermal damage on the substrates. By using light-reacting layer and laser irradiation through transparent sacrificial substrate, high performance flexible oxide TFT, flexible piezoelectric nanogenerator and flexible memory have been tranferred from bulk substrate to plastic substrates. We named this technolog as Inorganic Laser Lift-off (ILLO), providing new breakthrough of inorganic-based high peformance flexible electronics.

  • Related References

"High-Performance Flexible Thermoelectric Power Generator using Laser Multi-Scanning Lift-Off Process" ACS Nano, 10, 10851, 2016, PDF   [IF=13.9]

"Highly-Efficient, Flexible Piezoelectric PZT Thin Film Nanogenerator on Plastic Substrates" Adv. Mater., 26, 2514, 2014, PDF Cover Article.  [IF=19.8]

"Skin-Like Oxide Thin-Film Transistors for Transparent Displays" Adv. Funct. Mater., 26, 6170, 2016.  PDF Cover Article [IF=12.1]

"Flexible Crossbar Resistive Memory Arrays via Inorganic-based Laser Lift-off "  Adv. Mater., 26, 7480, 2014,  PDF, Cover Article.[IF=19.8]

  Laser-materials interaction

      

        Laser technology will play a crucial role in future flexible electornics since it enables high temperature process (over 1000 Celcius) on plastic substrate due to ultrashort pulse duration (nsesc~ usec). This high temperature process is the most difficult obstacle to achieve high performance electronics on plastics because plastics can not endure high temperature over 300 celcius, which is essencial process for high quality materials on plastics. We have created two innovative research fields; First, laser can synthesize the doped graphene from SiC substrates. Second, laser can align Block Copolymer Self-Assembly without prepatterned process.

  • Related References

"Flash-induced BCP Self-assembling"  Adv. Mater. in press  [IF=19.8]

"Xenon Flash Lamp-Induced Ultrafast Multilayer Graphene Growth"  Part., Part. Syst. Char., 10.1002/ppsc.201600429  PDF [IF=4.5]

"Laser Writing Block Copolymer Self-Assembly on Graphene Light Absorbing Layer"  ACS Nano, 10, 3435, 2016.  PDF [IF=13.9]

"Laser-induced Phase Separation of silicon carbide", Nat. Commun., 7, 13562, 2016. PDF [IF=12.1]

"Laser-Induced Solid Phase Doped Graphene" ACS Nano, 8, 7671, 2014, PDF [IF=13.9]

   FAND's Laser Facility

   Our group set up one of the best laser facility including excimer, CW laser, Flash Lamp, IR, solid state laser and DPSS laser for future flexible application and new nanomaterial synthesis.