A5102780922- Superconducting and THz Device Technology
- Physics of Superconductivity and Magnetism
- Thermal Radiation and Cooling Technologies
- Superconducting Materials and Applications
- Graphene research and applications
- MXene and MAX Phase Materials
- Supercapacitor Materials and Fabrication
- Acoustic Wave Resonator Technologies
- Nanowire Synthesis and Applications
- Advanced battery technologies research
- Mechanical and Optical Resonators
- Copper Interconnects and Reliability
- Metal and Thin Film Mechanics
- Carbon Nanotubes in Composites
- Advanced Thermoelectric Materials and Devices
- Semiconductor materials and devices
- Advancements in Battery Materials
- GaN-based semiconductor devices and materials
- Advanced MEMS and NEMS Technologies
- Thermal properties of materials
- Particle Accelerators and Free-Electron Lasers
- Corrosion Behavior and Inhibition
- Chalcogenide Semiconductor Thin Films
- Advanced Battery Materials and Technologies
- Silicon Carbide Semiconductor Technologies
Yonsei University
2021-2023
Goddard Space Flight Center
2019-2023
Association of Research Libraries
2023
University of Maryland, College Park
2012
Material Measurement Laboratory
2012
National Institute of Standards and Technology
2012
Potassium ion energy storage devices are competitive candidates for grid-scale applications owing to the abundancy and cost-effectiveness of potassium (K) resources, low standard redox potential K/K+, high ionic conductivity in K-salt-containing electrolytes. However, sluggish reaction dynamics poor structural instability battery-type anodes caused by insertion/extraction large K+ ions inhibit full K systems. Extensive efforts have been devoted exploration promising anode materials. This...
Ultra-high energy density battery-type materials are promising candidates for supercapacitors (SCs); however, slow ion kinetics and significant volume expansion remain major barriers to their practical applications. To address these issues, hierarchical lattice distorted α-/γ-MnS@Cox Sy core-shell heterostructure constrained in the sulphur (S), nitrogen (N) co-doped carbon (C) metal-organic frameworks (MOFs) derived nanosheets (α-/γ-MnS@Cox @N, SC) have been developed. The coordination...
Low-cost, highly efficient, and low-power devices are essential for energy harvesting applications. Despite numerous studies having been conducted on transferable graphene solar cells, large-area growth long-term stability continue to remain elusive, which limits the practicability of graphene-based photovoltaic devices. Plasma-enhanced chemical vapor deposition is a promising, facile method synthesizing over large area without use metal catalyst, but defects formed during adversely affect...
Two-dimensional layered materials have attracted attention for optoelectronic applications owing to their remarkable photonic properties. Here, we report a homojunction device fabricated using n-type ReS2 flakes; the exhibits p–n diode characteristics. The band structures of 1–5 L are theoretically calculated, and insensitivity work function thickness is experimentally investigated Kelvin probe force microscopy. contact resistance intrinsic mobility field-effect transistors with different...
At NASA Goddard Space Flight Center, we have previously demonstrated a kilo-pixel array of transition-edge sensor (TES) microcalorimeters capable meeting the energy resolution requirements future X-ray Integral Field Unit (X-IFU) instrument that is being developed for Advanced Telescope High ENergy Astrophysics (ATHENA) observatory satellite. The TES design in this was square device with side length <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML"...
We have developed fine-pitch, multilayer, superconducting wiring for routing around a ninety-degree corner terminated with wirebonding interfaces. The component-level testbed the Advanced Telescope High Energy Astrophysics (ATHENA) X-Ray Integral Field Unit (X-IFU) focal plane requires compact, high-density, low-crosstalk fanout to connect detectors in array NIST-fabricated SQUID time domain multiplexing (TDM) readout chips. full assembly baselines two interface chips: flexible chip bending...
We have characterized a full-scale transition-edge sensor (TES) microcalorimeter array as milestone towards the demonstration of technology readiness level (TRL) 5 for detector X-ray Integral Field Unit (X-IFU) instrument on ESA's future flagship X-Ray Observatory called Athena. fabricated 90 mm prototype TES and measured properties performance in newly developed platform which up to 960 out ∼3,200 pixels can be read out. In this paper, we report measurements uniformity transition...
The X-ray Integral Field Unit on <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">Athena</i> will be subject to a cosmic-ray induced thermal background orbit, with energy depositions into the detector wafer leading bath fluctuations. Such fluctuations have potential degrade resolution performance of transition-edge sensor based microcalorimeter. This problem was previously studied in simulations that modeled by events and evaluated resulting...
The design, modeling, fabrication, and characterization of a vibrationally trapped thickness-shear MEMS resonator is presented. This device intended to avoid various limitations flexural resonators, including nonlinearity, clamping losses, thermoelastic damping, high damping in liquid. It includes silicon bridge reference line on an SOI wafer, coupled Au/Cr coplanar waveguide, Lorentz-force coupling, variations waveguide thickness for vibrational trapping, circuitry nulling the components...
It is now possible to fabricate stacks of buried wires with extremely high density, perfect yield, and many layers using fine-line lithography chemical mechanical polish. Such wiring in principle will enable large format arrays fine pitch sensors. Buried has the distinct advantage that additional metallization – such as metallic links a thermal multiplexer (“hydra”) design attachment points between absorbers substrate are not limited their placement. In close-packed arrays, crosstalk occurs...
Although graphene has been explosively studied, reduced oxide (rGO) characteristics at low-temperatures have not analyzed. Therefore, in this study, we evaluated the low-temperature electrical properties of high-purity rGO to suggest possible electronic applications graphene. The rGO, which is an interconnector, was optimized various frequencies (10 kHz, 50 100 500 and 1 MHz) using dielectrophoretic dispersion. Various were measured range 80–290 K, while gate voltage applied. transfer...