A5100698915- Perovskite Materials and Applications
- Quantum Dots Synthesis And Properties
- Chalcogenide Semiconductor Thin Films
- ZnO doping and properties
- Gas Sensing Nanomaterials and Sensors
- Advanced Sensor and Energy Harvesting Materials
- Photonic Crystals and Applications
- Surface Modification and Superhydrophobicity
- Adhesion, Friction, and Surface Interactions
- Silicon and Solar Cell Technologies
- Plasmonic and Surface Plasmon Research
- Semiconductor materials and interfaces
- Metamaterials and Metasurfaces Applications
- Marine and Coastal Research
- Metallurgy and Material Forming
- Conducting polymers and applications
- Copper-based nanomaterials and applications
- Organic Light-Emitting Diodes Research
- Membrane-based Ion Separation Techniques
- Millimeter-Wave Propagation and Modeling
- Membrane Separation Technologies
- Radio Wave Propagation Studies
- Fuel Cells and Related Materials
- Crystal Structures and Properties
Korea University
2022-2023
Catholic University of Daegu
2016-2019
Agency for Defense Development
2018
Virginia Tech
2010
Korea Advanced Institute of Science and Technology
1996
Localized light matter interaction at a resonant nanostructure facilitates spectrally selective transmission of light, which has led to demonstrations ultrathin metasurface based optical filters. Unfortunately, due the nature Lorentzian spectral line shape in such resonances, it is inevitable suffer significant crosstalk. In this work, we demonstrate conceptually new type filter exhibits near flat-top bandpass with minimized overlaps. To realize this, leverage recent development non-local...
Electron transport layer (ETL) is pivotal to charge carrier for PSCs reach the Shockley–Queisser limit. This study provides a fundamental understanding of heterojunction electron layers (ETLs) at atomic level stable and efficient perovskite solar cells (PSCs). The bilayer structure an ETL composed SnO 2 on TiO was examined, revealing critical factor limiting its potential obtain performance. Alteration oxygen vacancies in underlayer via annealing process found induce manipulated band offsets...
The cesium lead iodide (CsPbI3) perovskite solar cell possesses a wide band gap ranging from 1.65 to 1.75 eV, which is suitable for integration into tandem structure along with low-band-gap silicon cell. Moreover, CsPbI3 has received considerable attention as potential solution the prevalent issues of low thermal stability organic–inorganic cells and phase segregation encountered in conventional mixed halide wide-band-gap cells. Through implementation volatile additives, demonstrated...
In this work, nickel silicide was applied to tandem solar cells as an interlayer. By the process of thermal evaporation, a layer NiOx, hole transport (HTL) deposited on n+ poly-Si directly. Nickel simultaneously formed by diffusion from NiOx during deposition and annealing process. The I–V characteristics NiOx/n+ contact with showed ohmic low resistivity. This structure is expected be more advantageous for electrical connection between perovskite top cell TOPCon bottom compared NiOx/TCO/n+...
Abstract In this study, we present a new fabrication process for proton exchange membranes based on inorganic/organic nanocomposite using in situ surface grafting reaction and reactive dispersion of silica nanoparticles the presence dispersant, urethane acrylate nonionomer (UAN). Through nanoparticles, acrylates were chemically introduced which dispersed DMSO solutions containing UAN sodium styrene sulfonate (NaSS). After linkage copolymerization NaSS, moieties converted to...
Compared to organic–inorganic hybrid perovskites, the cesium‐based all‐inorganic lead halide perovskite (CsPbI 3 ) is a promising light absorber for solar cells owing its higher resistance thermal stress. Nonetheless, additional research required reduce nonradiative recombination realize full potential of CsPbI . Here, diffusion Cs ions participating in ion exchange proposed be an important factor responsible bulk defects γ‐CsPbI perovskite. Calculations based on first‐principles density...
The super-hydrophobic surface can be used in anti-pollution, self-cleaning, and anti-corrosive properties. Two-step treatment process on Al-coated glass was conducted by etching using potassium hydroxide (KOH) coating lauric acid for surface. KOH-etched Al (1st etching) changed to a hydrophilic property with water contact angle (WCA) of 68° 48°. On the other hand, WCA etched about 153° when (2nd coating) applied 30 minutes. We found that hydrophobicity related roughness modification as well...
For the path loss prediction in mountainous areas, a method is proposed to adjust Lee model with diffraction methods using variable step-size least mean square algorithm. Measurements were conducted mountain areas compare performances. The performances improved by up 2.76 dB average error and 0.96 standard deviation of errors when compared non-tuned Joint Radio Company (JRC) models methods.
The (In2O3)77.34(ZnO)x(SnO2)22.66-x (denote to IZTO-2) films with x = 13, 15, 17, 19 wt.% were prepared on PET film a 100-nm-thick SiO2 buffer layer by using RF-magnetron sputtering method, and their electrical stabilities tested under various external stresses such as moist heat, temperature fluctuations bending of substrate films. lowest resistivity 4.8 × 10−4 Ω•cm was observed in the IZTO-2 17 which also had good properties high stability, surface uniformity, conductivity compared those...
To improve quality of the automotive steel grades, Posco has revamped caster Gwangyang Works in 2003. The been basically changed from curved mold to vertical bending. also features new technologies such as stopper rod flow control, multi mode EMS, hydraulic oscillator, optimized segment roll pitch, dynamic soft reduction and secondary cooling, hot slab grinding, monitoring package.
Indium-doped ZnO(ZnO:In) films have been prepared on heated Corning 7059 glass by pyrosol spray method. Indium improves the conductivity as an n-type dopant and stimulates grain growth. For grown at 400/spl deg/C, resistivity of ZnO decreased from 1.3/spl times/10/sup -2/ /spl Omega/ cm to 3.5/spl -3/ doping 1 wt% indium. Furthermore, ZnO:In higher temperture revealed larger sizes a texturization compared undoped films. A highly textured with 2.5/spl cm, total transmittance 80% was made...