A5087442826- 2D Materials and Applications
- Perovskite Materials and Applications
- MXene and MAX Phase Materials
- Graphene research and applications
- Chalcogenide Semiconductor Thin Films
- Attention Deficit Hyperactivity Disorder
- ZnO doping and properties
- Family and Disability Support Research
- Autism Spectrum Disorder Research
- Nanowire Synthesis and Applications
- Respiratory Support and Mechanisms
- Ga2O3 and related materials
- Sleep and related disorders
- Treatment of Major Depression
- Innovative Microfluidic and Catalytic Techniques Innovation
- Diabetes Management and Research
- Advanced biosensing and bioanalysis techniques
- Hyperglycemia and glycemic control in critically ill and hospitalized patients
- Transition Metal Oxide Nanomaterials
- Microfluidic and Capillary Electrophoresis Applications
- Semiconductor Quantum Structures and Devices
- Airway Management and Intubation Techniques
- GaN-based semiconductor devices and materials
- Organic and Molecular Conductors Research
- Neonatal Respiratory Health Research
Sungkyunkwan University
2014-2024
Chungbuk National University
2024
Pusan National University
2012-2024
Chungbuk National University Hospital
2024
Institute for Basic Science
2014-2023
Yang Hospital
2017
We report the synthesis of centimeter-scale, uniform 1T'- and 2H-MoTe2 thin films via tellurization Mo films. 1T'-MoTe2 was initially grown converted gradually to over a prolonged growth time under Te atmosphere. Maintaining excessive essential for obtaining stable stoichiometric phase. Further annealing lower partial pressure at same temperature, followed by rapid quenching, led reverse phase transition from 1T'-MoTe2. The orientation film determined rate. Slow key highly oriented entire...
Hexagonal boron nitride (h-BN) has recently been in the spotlight due to its numerous applications including being an ideal substrate for two-dimensional electronics, a tunneling material vertical devices, and growth template heterostructures. However, obtain large area of h-BN film while maintaining uniform thickness is still challenging not realized. Here, we report systematical study on Pt foil by using low pressure chemical vapor deposition with borazine source. The monolayer was...
We report the synthesis of centimeter-scale monolayer WS2 on gold foil by chemical vapor deposition. The limited tungsten and sulfur solubility in allows film growth surface. To ensure coverage uniformity film, source-coated substrate was placed parallel with Au under hydrogen sulfide atmosphere. high temperature near 935 °C helps to increase a domain size up 420 μm. Gold is reused for repeatable after bubbling transfer. WS2-based field effect transistor reveals an electron mobility 20 cm2...
We propose a semiconductor-insulator-semiconductor (SIS) heterojunction diode consisting of monolayer (1-L) MoS2, hexagonal boron nitride (h-BN), and epitaxial p-GaN that can be applied to high-performance nanoscale optoelectronics. The layered materials 1-L MoS2 h-BN, grown by chemical vapor deposition, were vertically stacked wet-transfer method on layer. final structure was verified confocal photoluminescence Raman spectroscopy. Current-voltage (I-V) measurements conducted compare the...
We present a novel metal–insulator–semiconductor (MIS) diode consisting of graphene, hexagonal BN, and monolayer MoS2 for application in ultrathin nanoelectronics. The MIS heterojunction structure was fabricated by vertically stacking layered materials using simple wet chemical transfer method. each layer confirmed confocal scanning Raman spectroscopy device performance evaluated current versus voltage (I–V) photocurrent measurements. clearly observed better rectification much higher flow...
Abstract Carrier multiplication (CM) is a process in which high-energy free carriers relax by generation of additional electron-hole pairs rather than heat dissipation. CM promising disruptive improvements photovoltaic energy conversion and light detection technologies. Current state-of-the-art nanomaterials including quantum dots carbon nanotubes have demonstrated CM, but are not satisfactory owing to high-energy-loss inherent difficulties with carrier extraction. Here, we report van der...
Abstract Although large exciton binding energies of typically 0.6–1.0 eV are observed for monolayer transition metal dichalcogenides (TMDs) owing to strong Coulomb interaction, multilayered TMDs yield relatively low increased dielectric screening. Recently, the ideal carrier-multiplication threshold energy twice bandgap has been realized in semiconducting 2H-MoTe 2 with a conversion efficiency 99%, which suggests interaction. However, origin interaction , including energy, not elucidated...
Carrier multiplication (CM), the process of generating multiple charge carriers from a single photon, offers an opportunity to exceed Shockley-Queisser limit in photovoltaic applications. Despite extensive research, no material...
We report growth of tungsten diselenide (WSe 2 ) nanotubes by chemical vapor deposition with a two‐zone furnace. WO 3 nanowires were first grown annealing thin films under argon ambient. WSe then at the tips through selenization via two steps: (i) formation tubular structures on outside nanowires, resulting in core (WO )–shell and (ii) nanowires. The observed seed is markedly different from existing substitutional nanotubes, where oxygen atoms are replaced selenium to form nanotubes. Another...
Organic systems often allow to create two triplet spin states (triplet excitons) by converting an initially excited singlet state (a exciton). An ideally designed organic/inorganic heterostructure could reach the photovoltaic energy harvest over Shockley-Queisser (S-Q) limit because of efficient conversion excitons into charge carriers. Here, we demonstrate molybdenum ditelluride (MoTe 2 )/pentacene boost carrier density via transfer from pentacene MoTe using ultrafast transient absorption...
Children with autism are often medicated to manage emotional and behavioral symptoms; yet, data on such pharmacotherapy is insufficient. In this study, we investigated the Korean National Health Insurance Claims Database (NHICD) information related incidence psychotropic medication use. From 2010-2012 NHICD, selected a total of 31,919,732 subjects under 19 years old. To examine diagnostic incidence, patients who had at least one medical claim containing an 10th revision International...
Although van der Waals (vdW) layered $\mathrm{Mo}{\mathrm{S}}_{2}$ shows the phase transformation from semiconducting $2H$ to metallic $1T$ through chemical lithium intercalation, vdW $\mathrm{MoT}{\mathrm{e}}_{2}$ is thermodynamically reversible between $2H$- and $1{T}^{\ensuremath{'}}$ phases, can be further transformed by energetics, laser irradiation, strain or pressure, electrical doping. Here, thickness- temperature-dependent optical properties of...
<title>Abstract</title> Carrier multiplication (CM), the process of generating multiple charge carriers from a single photon, offers an opportunity to exceed Shockley-Queisser limit for solar cell efficiency. However, realizing significant efficiency improvements through CM in traditional semiconductors has proven challenging, necessitating fine-tuning material properties. In this study, we utilize ultrafast transient absorption spectroscopy demonstrate that monolayer MoSe<sub>2</sub> can...
Seong Woo Cho, Yeon Jung Lee, Ae Minha Hong, Sang Min Jin Cheol Park, and Geon Ho Bahn. J Korean Acad Child Adolesc Psychiatry 2017;28:183-9. https://doi.org/10.5765/jkacap.2017.28.3.183
Carrier multiplication (CM), a photo-physical process to generate multiple electron-hole pairs by exploiting excess energy of free carriers, is explored for efficient photovoltaic conversion photons from the blue solar band, predominantly wasted as heat in standard cells. Current state-of-the-art approaches with nanomaterials have demonstrated improved CM but are not satisfactory due high loss and inherent difficulties carrier extraction. Here, we report ultra-efficient van der Waals (vdW)...
Abstract Although large exciton binding energies of typically 0.6–1.0 eV are observed for monolayer transition metal dichalcogenides (TMDs) owing to strong Coulomb interaction, multilayered TMDs yield relatively low increased dielectric screening. Recently, the ideal carrier-multiplication threshold energy twice bandgap has been realized in semiconducting 2H-MoTe 2 with a conversion efficiency 99%, which suggests interaction. However, origin interaction , including energy, not elucidated...