A5011516232- Electronic Packaging and Soldering Technologies
- Copper Interconnects and Reliability
- Metamaterials and Metasurfaces Applications
- Plasmonic and Surface Plasmon Research
- 3D IC and TSV technologies
- Photonic Crystals and Applications
- Nanomaterials and Printing Technologies
- Nanofabrication and Lithography Techniques
- Advanced Sensor and Energy Harvesting Materials
- Semiconductor materials and interfaces
- Molecular Junctions and Nanostructures
- Semiconductor materials and devices
- Photonic and Optical Devices
- Metal and Thin Film Mechanics
- Aluminum Alloys Composites Properties
- Advanced Antenna and Metasurface Technologies
- Liquid Crystal Research Advancements
- 2D Materials and Applications
- Digital and Cyber Forensics
- Orbital Angular Momentum in Optics
- Artificial Intelligence in Healthcare
- Semiconductor Lasers and Optical Devices
- Advanced Materials and Mechanics
- Perovskite Materials and Applications
- X-ray Spectroscopy and Fluorescence Analysis
Pohang University of Science and Technology
2004-2025
Hanyang University
2022-2023
LG Chem (South Korea)
2019
Andong National University
2014-2016
Sustainable energies from weather are the most ubiquitous and non-depleted resources. However, existing devices exploiting weather-dependent sensitive to conditions geographical locations, making their universal applicability challenging. Herein, we propose an all-weather sustainable glass surface integrating a triboelectric nanogenerator radiative cooler, which serves as device, harvesting energy raindrops saving on sunny days. By systematically designing transparent, high-performance...
Nanoimprint lithography is gaining popularity as a cost-efficient way to reproduce nanostructures in large quantities. Recent advances nanoimprinting using high-index nanoparticles have demonstrated replication of photonic devices, but it difficult confer special properties on beyond general metasurfaces. Here, we introduce novel method for fabricating light-emitting metasurfaces lithography. By utilizing quantum dots embedded resin, successfully imprint dielectric that function...
Sampling is a pivotal element in the design of metasurfaces, enabling broad spectrum applications. Despite its flexibility, sampling can result reduced efficiency and unintended diffractions, which are more pronounced at high numerical aperture or shorter wavelengths, e.g. ultraviolet spectrum. Prevailing metasurface research has often relied on conventional Nyquist theorem to assess appropriateness, however, our findings reveal that criterion insufficient guidance for metasurface....
Monolayer transition metal dichalcogenides are promising materials that not only atomically thin but also have direct bandgaps, making them highly regarded in optics and optoelectronics. However, their photoluminescence exhibits almost random polarization at room temperature. The emission is omnidirectional weak due to the low quantum yield. These limitations hamper development of practical optoelectronic devices solid-state single-photon sources for technologies. Here, we demonstrate...
Abstract Humidity‐responsive structural coloration is actively investigated to realize real‐time humidity sensors for applications in smart farming, food storage, and healthcare management. Here, humidity‐tunable nano pixels are with a 700 nm resolution that demonstrates full standard RGB (sRGB) gamut coverage millisecond‐response time. The color designed as Fabry–Pérot (F–P) etalons which consist of an aluminum mirror substrate, humidity‐responsive polyvinyl alcohol (PVA) spacer, top layer...
We describe the general characteristics and first result of a new synchrotron beamline at Pohang Light Source in Korea. The beamline, operated by Korean–Taiwanese–Swiss consortium, is dedicated to microimaging experiment real time with coherent x rays. performances tests already reach excellent levels when compared other similar facilities worldwide. key feature use unmonochromatized rays achieve very high lateral resolution.
Semiconductor products used in high-performance computing (HPC) and artificial intelligence (AI) applications require higher memory bandwidth, greater input/output (I/O) count, better power delivery network (PDN) performance improved heat dissipation characteristics. To meet these requirements, a 2.5D package architecture with Through Silicon Via (TSV)-bearing silicon (Si) interposer is mainly volume production. However, redistribution layer (RDL) emerging as cost effective alternative....
Abstract We describe a rapid and simple method to create Ag nanostructures by using direct mechanical patterning of ionic ink coating under gentle pressure, then thermal annealing reduce the metallic layer. The liquid-phase is easily obtained spin-coating that has appropriate concentration can be either printed or imprinted on desired substrate soft elastomer mold, reduced nanostructure subsequent annealing. More specifically, we present two methods: transfer printing nanoimprinting. In...
Digital healthcare combined with telemedicine services in the form of convergence digital technology and AI is developing rapidly.Digital research being conducted on many conditions including shock.However, causes shock are diverse, treatment very complicated, requiring a high level medical knowledge.In this paper, we propose detection method based correlation between data extracted from hemodynamic monitoring equipment.From various parameters expressed by equipment, four closely related to...
Abstract The effects of 200 °C post-annealing and 85 85% relative humidity temperature (T/H) treatments on the interfacial adhesion energy a Cu/SiN x interface were systematically investigated. results four-point bending test, X-ray photoemission spectroscopy, high-resolution transmission electron microscopy revealed that during T/H treatment decreased with time faster than annealing treatment, which is closely related to Cu oxidation SiN /Cu interfaces.
The Internet of Things (IoT) is being used in a wide variety fields due to the recent 4th industrial revolution.In particular, research conducted that combines IoT with medical field such as telemedicine.Among them, shock detection big issue because causes are diverse, treatments very complex, and require high level knowledge experience.The transmission infectious diseases common when treating critically ill patients, especially patients shock.Thus, effectively care for we propose an...
Effects of 200 °C annealing and 85 °C/85% relative humidity (R.H.) temperature/humidity environments on the electrical resistivity interfacial adhesion energy between screen-printed Ag film polyimide substrate were systematically investigated. Measured peel strength was 22.2 gf/mm before environmental treatment, then decreased to 0.1 0.5 for treatment during 500 hours, respectively. Cu oxide formation at Cu/Ag interface degradation itself seem be responsible decrease treatments, Screen...
BIC is a promising resonant mode with attractive properties such as an infinite quality factor and vortex far field pattern. UCNPs emit visible photons when they are excited by NIR photons. In this research, we design metasurface that wavelengths of the BICs targeted to excitation wavelength emission band UCNPs. As result coupling between BICs, can be observed in far-field PL was significantly enhanced.
The nonlocal metasurface modulates optical properties with a high wavelength selectivity. In this research, we demonstrate polarization-wavelength selective using nanoparticle-embedded resin printing. QDs are also embedded in the nanoparticle composites so that operates as both an emitter and resonator simultaneously. contributes to enhancing photoluminescence of QDs, well QDs' emission is controlled by polarization. This work provides way can be utilized for polarization-selective light...
Nanoimprinting can fabricate nanostructures with low manufacturing costs and high throughput, overcoming the limit of conventional fabrication. In this research, we a photonic crystal resonator composed QDs TiO2 nanoparticles using nanoimprinting technique. The PL is enhanced by coupling to quality factor optical mode, which supported consisting no loss dielectric composite. We demonstrate imprinted nanophotonic device operate as an enhance light-matter interaction. Additionally, research...
반도체 미세구리배선 적용을 위하여 구리배선의 습식 표면처리 및 열 사이클에 따른 구리 박막과 실리콘질화막 도포층 사이의 계면접착에너지를 4점굽힘시험을 통해 정량적으로 평가하였다. 구리배선을 화학적 기계적 연마한 후 표면처리를 통하여 실리콘질화막의 계면접착에너지는 <TEX>$10.57J/m^2$</TEX>에서 <TEX>$14.87J/m^2$</TEX>로 증가하였다. <TEX>$-45{\sim}175^{\circ}C$</TEX>범위에서 250사이클 후, 하지 않은 시편의 <TEX>$5.64J/m^2$</TEX>으로, 한 시편은 <TEX>$7.34J/m^2$</TEX>으로 감소하였으며, 모든 박리계면은 계면으로 확인되었다. X-선 광전자 분광법으로 계면 결합 상태를 분석한 결과, 연마 공정 표면 산화물이 습식표면처리에 의해 효과적으로 제거된 것을 확인하였다. 또한, 사이클 처리동안, 큰 팽창 계수 차이로 인한 열응력으로 인하여 계면이 취약해지고, 계면을 통한 산소유입에 산화층이...
차세대 반도체의 초미세 Cu 배선 확산방지층 적용을 위해 원자층증착법(atomic layer deposition, ALD) 공정을 이용하여 증착한 RuAlO 확산방지층과 박막 계면의 계면접착에너지를 정량적으로 측정하였고, 환경 신뢰성 평가를 수행하였다. 접합 직후 4점굽힘시험으로 평가된 계면접착에너지는 약 <TEX>$7.60J/m^2$</TEX>으로 측정되었다. <TEX>$85^{\circ}C$</TEX>/85% 상대습도의 고온고습조건에서 500시간이 지난 후 측정된 <TEX>$5.65J/m^2$</TEX>로 감소하였으나, <TEX>$200^{\circ}C$</TEX>에서 500시간 동안 후속 열처리한 후에는 <TEX>$24.05J/m^2$</TEX>으로 계면접착에너지가 크게 증가한 것으로 평가되었다. 4점굽힘시험 박리된 계면은 직후와 고온고습조건의 시편의 경우 RuAlO/<TEX>$SiO_2$</TEX> 계면이었고, 열처리 조건에서는 Cu/RuAlO 계면인 확인되었다....
Fan-Out Packages (FOPs) technology is actively researched because it enables high Input / Output (I/O) pads density, thin package, and cost reduction. Epoxy Molding Compound (EMC) materials play a major role in implementing FOPs. EMC acts as substrate also protects the chips from outside. Recently Films (EMFs) have been introduced EMFs are advantageous for large-area molding can solve planarization problem. However, there many problems before using at FOPs such voids, delamination, warpage,...