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Research Fields

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


  Self-powered Piezoelectric Thin Film Nanogenerator

   The piezoelectric effect refers to voltage generation by pressure or bending strength is applied to piezo nano-materials. The ceramic materials that have a perovskite structure have a high piezoelectric efficiency. However, it has been very difficult to use these materials to fabricate flexible energy harvesting devices due to a brittle property of ceramics. Our group has succeeded in developing a
highly efficient flexible piezoelectric energy harvester using freely bendable piezoelectric ceramic thin films that can convert the tiny movements of human body (such as heart beats and blood flow) into electricity.  

  • Related References

"In Vivo Self-Powered Wireless Transmission Using Biocompatible Flexible Energy Harvesters" Adv. Funct. Mater., 10.1002/adfm.201700341,  PDF [IF=12.1]

"Flexible highly-effective energy harvester via crystallographic and computational control of nanointerfacial morphotropic piezoelectric thin film" Nano Research. 10, 437, 2017,  PDF [IF=7.4]

"Self-powered Wireless Sensor Node Enabled by an Aerosol PZT Flexible Energy Harvester" Adv. Energy Mater. 6, 1600237, 2016,  PDF [IF=16.7]

"Self-powered Deep Brain Stimulation via a Flexible PIMNT Energy Harvester"  Energy Environ. Sci. 8, 2677, 2015. PDF  [IF=29.5]

"Hyper-Stretchable Elastic Composite Energy Harvester" Adv. Mater., 27, 2866, 2015  PDF, [IF=19.8]

"Reconfigurable Rectified Flexible Energy Harvester via Solid-State Single Crystal Grown PMN-PZT" Advanced Energy Materials, 5, 1500051, 2015, PDF [IF=16.7]

"Self-powered Fully-Flexible Light Emitting Systems enabled by Flexible Energy Harvester", Energy Environ. Sci., 7(12), 4035, 2014, PDF [IF=29.5]

 "Self-Powered Cardiac Pacemaker Enabled by Flexible Single Crystalline PMN-PT Piezoelectric Energy Harvester" Adv. Mater., 26, 4880, 2014, PDF [IF=19.8]

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

"Large-Area and Flexible Lead-Free Nanocomposite Generator Using Alkaline Niobate Particles and Metal Nanorods Filler" Adv. Funct. Mater., 24(18), 2620, 2014   PDF [IF=12.1]

"Flexible and Large-area Nanocomposite Generator based on Lead Zirconate Titanate Particles and Carbon Nanotubes", Advanced Energy Materials 3, 1539, 2013 PDF [IF=16.7]

"Virus-Directed Design of a Flexible BaTiO3 Nanogenerator" ACS Nano  7(12), 11016, 2013  PDF [IF=13.9]

"Flexible Nanocomposite Generator Made of BaTiO3 Nanoparticles and Graphitic Carbons", Adv. Mater., 24, 2999, 2012 PDF [IF=19.8]

"Piezoelectric BaTiO3 Thin Film Nanogenerator on Plastic Substrates", Nano Letters, 10(12) , 4939 (2010). PDF  [IF=12.7]

    Self-powered Triboelectric Nanogenerator

    Triboelectrification is contact electrification in which certain materials become electrically charged after they come into frictional contact with a different material. Triboelectric nanogenerators convert mechanical energy into electricity by a conjunction of triboelectrification and electrostatic induction. Triboelectric energy harvesting is possible not only for self-powered portable electronics but also as a new energy technology with potential to contribute to the earth energy issue in the future. We are currently developping innovative energy harvesting product that can offer unprecedent self-powered energy source for daily human life.

  • Related References

"Performance-Enhanced Triboelectric Nanogenerator Enabled by Wafer-Scale Nanogrates of Multistep Pattern Downscaling" Nano Energy 35, 415, 2017, PDF  [IF=12.3]

"Topographically-Designed Triboelectric Nanogenerator via Block Copolymer Self-Assembly" Nano Letters 14, 7031, 2014, PDF  [IF=12.7]

    Flexible Thin Film Battery

  High-performance flexible power sources have gained attention as they enable the realization of next-generation bendable, implantable, and wearable electronic systems. Our group has fabricated an all-solid-state bendable LIB structured with high-density inorganic thin films using a new transfer approach, which enables the realization of diverse flexible LIBs regardless of electrode chemistry. This technology can form high-temperature annealed electrodes on polymer substrates for high-performance LIBs.

  • Related References

"Bendable Inorganic Thin-Film Battery for Fully Flexible Electronic Systems", Nano Letters, 12(9), 4810, (2012).  PDF [IF=12.7]