A5100770946- Supercapacitor Materials and Fabrication
- Advancements in Battery Materials
- Thin-Film Transistor Technologies
- Silicon and Solar Cell Technologies
- Quantum Dots Synthesis And Properties
- Integrated Circuits and Semiconductor Failure Analysis
- Advanced Battery Materials and Technologies
- Catalysis and Hydrodesulfurization Studies
- Petroleum Processing and Analysis
- Advancements in Photolithography Techniques
- Luminescence Properties of Advanced Materials
- Silicon Nanostructures and Photoluminescence
- Advanced Surface Polishing Techniques
- Advanced Sensor and Energy Harvesting Materials
- Conducting polymers and applications
- Ion-surface interactions and analysis
- Semiconductor Quantum Structures and Devices
- Chalcogenide Semiconductor Thin Films
- Diamond and Carbon-based Materials Research
- Electron and X-Ray Spectroscopy Techniques
- Advanced Battery Technologies Research
- Metal and Thin Film Mechanics
- Semiconductor materials and devices
- Advanced Photocatalysis Techniques
- Chemical Synthesis and Characterization
Samsung (South Korea)
2010-2025
Hanyang University
2002-2023
LG (South Korea)
2019-2023
Anyang University
2021-2023
Kyushu University
2006-2021
LG Chem (South Korea)
2019-2021
Daejeon University
2019-2020
University of California, Berkeley
2014-2018
IMEC
2011-2017
Korea Research Institute of Chemical Technology
2016-2017
Treatment of InP colloidal quantum dots (QDs) with hydrofluoric acid (HF) has been an effective method to improve their photoluminescence yield (PLQY) without growing a shell. Previous work shown that this can occur through the dissolution fluorinated phosphorus and subsequent passivation indium on reconstructed surface by excess ligands. In article, we demonstrate very significant luminescence enhancements at lower HF exposure though different mechanism. At HF, main role fluoride ions is...
This paper presents a novel approach to face-to-face wafer-to-wafer (W2W) bonding using SiCN-to-SiCN dielectric bonding, in combination with direct Cu-Cu Cu pads of unequal size and surface topography for the top bottom wafers. The use SiCN dielectrics allows obtain high W2W energy (> 2 J/m <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> ) at low annealing temperature (250 °C). Excellent is obtained after 350 °C. A CMP process, resulting...
Silver nanocrystals were synthesized by reducing AgNO3 in N,N-dimethylformamide (DMF) solution. Besides decahedral and icosahedral nanoparticles, a series of their intermediate particles, which consist combination two more tetrahedra, are obtained. It was found that nanoparticles not formed through assembling tetrahedra separately but produced the stepwise growth tetrahedral units on specific facets DMF. A simple model suggested position fourth unit determines whether decahedron or...
In this work, the fabrication and application of highly conductive, robust, flexible, oxidation-resistant Cu–Ni core–shell nanoparticle (NP)-based electrodes have been reported. Cu@Ni NPs with a tunable Ni shell thickness were synthesized by varying Cu/Ni molar ratios in precursor solution. Through continuous spray coating flash photonic sintering without an inert atmosphere, large-area NP-based conductors fabricated on various polymer substrates. These demonstrate low sheet resistance 1.3 Ω...
The conductive nanomaterials applicable to unconventional printing techniques have attracted a great deal of attention, and in particular, cost-effective copper-based electrode materials been recognized as viable candidates for replacement the expensive silver counterpart. In this study, we synthesize newly designed Cu/Cu10Sn3 core/shell nanoparticles, an additive material overcoming critical drawbacks Cu nanoparticle-based electrodes, combination with large-area processable, continuous...
Reported is the capacitive behavior of homogeneous and well-defined surfaces pristine carbon nanofibers (CNFs) surface-modified CNFs. The capacitances CNFs were measured with cyclic voltammetry to correlate surface structure capacitance. Among studied CNFs, edge platelet (PCNF) herringbone more effective in charging than basal plane tubular CNF by a factor 3−5. Graphitization PCNF (GPCNF) changed into domelike surface, corresponding decreased from 12.5 3.2 F/g. A chemical oxidation GPCNF,...
In this study, the interfacial and electrokinetic phenomena of mixtures isopropyl alcohol (IPA) deionized (DI) water in relation to semiconductor wafer drying is investigated. The dielectric constant an IPA solution linearly decreased from 78 18 with addition DI water. viscosity solutions increased as volume percentage increased. zeta potentials silica particles silicon wafers were also measured solutions. potential approached neutral values ratio A surface tension decrease 72 was when...
Additional Ce3+ doping improves the luminescence of Li2SrSiO4:Eu2+, a yellow phosphor for ultraviolet or blue light-emitting diodes. By examining photoluminescence Li2SrSiO4:Ce3+, and Li2SrSiO4:Ce3+,Eu2+, it was confirmed that energy transfer from to Eu2+ ions contributes little enhanced Li2SrSiO4:Ce3+,Eu2+. Alternatively, we suggested could stabilize Li vacancies, inhibit oxidization Eu3+, consequently increase emission intensity, based on characterizations with decay time synchrotron light...
Non-toxic InP-based nanocrystals have been developed for promising candidates commercial optoelectronic applications and they still require further improvement on photophysical properties, compared to Cd-based quantum dots (QDs), better device efficiency long-term stability. It is, therefore, essential understand the precise mechanism of carrier trapping even in state-of-the-art QD with near-unity luminescence. Here, it is shown that using time-resolved spectroscopic measurements...
Abstract Recent advances in mass transfer technology are expected to bring next‐generation micro light‐emitting diodes (µLED) displays into reality, although reliable integration of the active‐matrix backplane with transferred µLEDs remains as a challenge. Here, µLED display is innovated by demonstrating pixel circuit‐integrated micro‐LEDs (PIMLEDs) and integrating them onto transparent glass substrate. The PIMLED comprises low‐temperature poly‐silicon transistors GaN µLED. square‐shaped...
Nanoparticle crystalline iron phosphates (FePO4∙2H2O and FePO4) were synthesized using a (CTAB) surfactant as an anode material for Li rechargeable batteries. The electrochemical properties of the nanoparticle characterized with voltage window 2.4–0 V. A variscite orthorhombic FePO4∙2H2O showed large initial charge capacity 609mAh∕g. On other hand, tridymite triclinic FePO4 exhibited excellent cyclability: retention up to 30 cycles was ∼80%, from 485 375mAh∕g. phosphate anodes highest...
We present a novel approach to enhance light emission in Si and demonstrate sub-bandgap emitting diode based on the introduction of point defects that radiative recombination rate.Ion implantation, pulsed laser melting rapid thermal annealing were used create containing self-interstitial-rich optically active region from which zero-phonon line at 1218 nm originates.
-coated thin films showed electrochemical properties superior to those of bare film. Moreover, the coated were affected by nanostructures -coating layer, which was deposited at various deposition temperatures. In particular, with optimal capacity retention. It found that layer effectively suppressed increase in charge-transfer resistance during cycling, as measured impedance spectroscopy. This dependence on temperature attributed and interdiffusion interface between nanoscale-coating layer.
The crystal structure of β-Ca3SiO4Cl2 was determined by the ab initio determination method based on synchrotron powder XRD data for first time, and luminescence properties a Eu2+-doped phosphor were characterized. found to be monoclinic (space group P21/c) with lattice parameters, = 5.91234(1) Å, b 10.20128(1) c 10.98866(1) β 90.3423(1)°. This can considered as an intergrowth built up from alternating stacks two layered sublattices, ∞2[Ca2SiO4] ∞2[CaCl2], along [100] direction. In this...
A new, earth-abundant, environmentally benign, and stable inorganic blue chromophore series Sr2(Mg1−xMnx)Ge2O7+δ has been prepared characterized by X-ray absorption spectroscopy, synchrotron diffraction, ab initio total energy calculation. As the content of Mn in compound was increased, color changed from white (for x = 0.0) to sky blue, deep finally black body 1.0). Sr2MgGe2O7 melilite-type structure comprising Mg(2+)O4 GeO4 tetrahedra. On other hand, it found that ion is mainly trivalent...