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.
"Plasmonic-Tuned Flash Cu Nanowelding for Ultrafast Photochemical-Reducing and Interlocking on Flexible Plastics" Adv. Funct. Mater., 10.1002/adfm.201701138PDF[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.
"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]
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.
"Flash-induced BCP Self-assembling" Adv. Mater. in press [IF=19.8]