Sung-Wook Kim (김성욱)
Sung-Wook Kim (김성욱)
Post Doctoral
Post Doctoral
Our research group focused on a photoelectrochemical (PEC) water splitting system to produce the hydrogen energy by semiconducting materials and solar energy. To enhance the solar-to-hydrogen (STH) conversion efficiency, various strategies (doping, nano-structuring, junction, surface modification, and DFT calculation) of semiconducting electrode have been studied in our laboratory. Our main goal is to develop a high-performance PEC system that can lead to a green hydrogen society.
Photoelectrochemical (PEC) water splitting
Solar Desalination
Solar desalination, which utilizes solar energy, is a promising technology for converting seawater into fresh water. Its advantages include reducing environmental impact, addressing water shortages, and relying on abundant resources such as water, and solar energy. As evaporation is a surface phenomenon, solar desalination is based on the interfacial evaporation principle using a photoabsorber, which is the same as natural evaporation.
Zinc-Ion Batteries
Zinc-Ion batteries are a type of rechargeable battery that uses zinc ions as the charge carriers. They have emerged as a promising alternative to traditional batteries due to their numerous advantages such as safety, higher theoretical volumetric capacity of Zn (820 mAh/g) , non-toxicity, and easy processibility, abundant raw material resources, low cost compared to lithium-ion batteries.
Hybrid Supercapacitor
Hybrid supercapacitors are energy storage devices that combine the energy storage capability of batteries with the power delivery capability of supercapacitors. They offer a high energy density, rapid charging and discharging, long cycle life, maintenance-free operation, and safer operability. These features make them ideal for a wide range of applications, including those requiring quick bursts of power, long-lasting power sources, and those where safety is a concern.
EUV Hybrid Photoresist
Improving semiconductor integrated circuit's performance by reducing critical dimensions and implementing high-resolution patterns is entirely dependent on the resolution limit of lithography. circuit line width of semiconductors are getting shorter and higher resolution patterns are required. Extreme Ultra Violet (EUV) lithography is the promising technique of next-generation semiconductors that can overcome this limitation. However, existing organic chemically amplified resists have limits because of poor pattern transfer and pattern collapse, Line width roughness deterioration due to photon stochastic and acid stochastic in EUV state. Therefore, the development on organic-inorganic hybrid cluster Photoresist with high photon adsorption and moderate etch selectivity is needed for EUV lithography.
Synthesis of 2D Material
Graphene is a material composed of pure carbon atoms, arranged in a regular hexagonal pattern. Graphene can be described as a one-atom thick layer of the mineral graphite. It has drawn a lot of attention due to its great properties such as high optical transmittance, excellent electrical conductivity, high flexibility, and large theoretical surface area, and great mechanical stability. The charge mobility is 100 times higher than that of silicon and current density is 100 times higher than that of copper as well as best thermal conductivity among carbon materials. Transparency and flexibility much better than existing ITO (Induim Tin Oxide) used as a transparent electrode material. Graphene is applied in various ways, such as touch panels, flexible displays, high-efficiency solar cells, coating materials, secondary battery electrodes.
1D, 2D, 3D nano-periodic structure
Holographic Interference Lithography (HIL) is a fast and efficient technique that allows one to create 1D, 2D and 3D (Three-Dimensional) nano-periodic structures with large-area and defect-free coverage. Structures with a variety of geometries with nanometer-scale features and sub micrometer periodicities have many applications in optics and acoustics. Additionally, this technique offers increased control over cell geometry and volume fraction. Because of many advantages that IL offers for 3D fabrication, it became subject of very active investigations in recent years.
