A5004821252- 2D Materials and Applications
- Graphene research and applications
- Advanced Sensor and Energy Harvesting Materials
- Organic Electronics and Photovoltaics
- Perovskite Materials and Applications
- Advanced Memory and Neural Computing
- MXene and MAX Phase Materials
- Conducting polymers and applications
- Semiconductor materials and devices
- Quantum and electron transport phenomena
- Structural Behavior of Reinforced Concrete
- Molecular Junctions and Nanostructures
- Acoustic Wave Resonator Technologies
- Chaos-based Image/Signal Encryption
- Physical Unclonable Functions (PUFs) and Hardware Security
- Structural Load-Bearing Analysis
- Machine Learning in Materials Science
- Electronic and Structural Properties of Oxides
- ZnO doping and properties
- Advancements in Semiconductor Devices and Circuit Design
- Inorganic Chemistry and Materials
- Ferroelectric and Piezoelectric Materials
- Internet of Things and Social Network Interactions
- Transition Metal Oxide Nanomaterials
- Advanced Condensed Matter Physics
Kumoh National Institute of Technology
2016-2025
Sungkyunkwan University
2025
Catholic University of Korea
2024
Materials Science & Engineering
2024
Convergence
2024
Korea Electronics Technology Institute
2022
University of Waterloo
2018-2021
LG (South Korea)
2021
Ulsan National Institute of Science and Technology
2021
Dongseo University
2013-2020
We conduct a comprehensive study of three different magnetic semiconductors, CrI
We report the observation of a very large negative magnetoresistance effect in van der Waals tunnel junction incorporating thin magnetic semiconductor, CrI3, as active layer. At constant voltage bias, current increases by nearly one million percent upon application 2 T field. The arises from change between antiparallel to parallel alignment spins across different CrI3 layers. Our results elucidate nature state ultrathin and present new opportunities for spintronics based on two-dimensional materials.
Dual doping-driven perpendicular electric field with opposite directions remarkably increase the on/off current ratio of bilayer graphene field-effect transistors. This unambiguously proves that it is possible to open a bandgap two molecular dopants (F4-TCNQ and NH2-functionalized self-assembled monolayers (SAMs)) even in single-gate device structure. Detailed facts importance specialist readers are published as "Supporting Information". Such documents peer-reviewed, but not copy-edited or...
Two-dimensional (2D) magnetism has been long sought-after and only very recently realized in atomic crystals of magnetic van der Waals materials. So far, a comprehensive understanding the excitations such 2D magnets remains missing. Here we report polarized micro-Raman spectroscopy studies on honeycomb ferromagnet CrI3. We show definitive evidence two sets zero-momentum spin waves at frequencies 2.28 terahertz (THz) 3.75 THz, respectively, that are three orders magnitude higher than those...
The polymer‐supported wet transfer of chemical vapor deposition‐grown graphene provides high‐quality large‐area on a target substrate. transfer‐induced defects that result from these processes, such as micrometer‐scale folds and cracks, have been regarded an inevitable problem. Here, the processes are thoroughly examined stage‐by‐stage it is found lamination wrinkles, which cause in graphene, generated high contact angles trapped medium liquids. Systematic theoretical experimental studies...
Photon harvesting in organic solar cells is highly dependent on the anisotropic nature of optoelectronic properties photoactive materials. Here, we demonstrate an efficient approach to dramatically enhance photon planar heterojunction by using a graphene–organic heterointerface. A large area, residue-free monolayer graphene inserted at anode interface serve as atomically thin epitaxial template for growing orientated pentacene crystals with lying-down orientation. This orientation enhances...
Transferring graphene without water enables water-sensitive substrates to be used in electronics. A polymeric bilayer (PMMA/PBU) is coated on as a supporting layer for the water-free transfer process and an excellent passivation that enhances device operation. As service our authors readers, this journal provides information supplied by authors. Such materials are peer reviewed may re-organized online delivery, but not copy-edited or typeset. Technical support issues arising from (other than...
Pentacene (C22H14), a polycyclic aromatic hydrocarbon, was used as both supporting and sacrificing layers for the clean doping-free graphene transfer. After successful transfer of to target substrate, pentacene layer physically removed from surface by using intercalating organic solvent. This solvent-mediated removal investigated theoretical calculation experimental studies with various solvents. The uses appropriate intercalation solvent enabled without forming residue layer. Such residues...
Exploring new parameter regimes to realize and control novel phases of matter has been a main theme in modern condensed physics research. The recent discovery 2D magnetism nearly freestanding monolayer atomic crystals already led observations number magnetic phenomena absent bulk counterparts. Such intricate interplays between crystalline structures provide ample opportunities for exploring quantum phase transitions this regime. Here, using field temperature dependent circularly polarized...
Materials that demonstrate large magnetoresistance have attracted significant interest for many decades. Extremely tunnel (TMR) has been reported by several groups across ultrathin CrI3 exploiting the weak antiferromagnetic coupling between adjacent layers. Here, we report a comparative study of TMR in all three chromium trihalides (CrX3, X = Cl, Br, or I) two-dimensional limit. As materials exhibit different transition temperatures and interlayer magnetic ordering ground state, tunneling...
A two-dimensional epitaxial growth template for organic semiconductors was developed using a new method transferring clean graphene sheets onto substrate with controlled surface wettability. The introduction of sacrificial layer between patterned polymeric supporting and monolayer sheet enabled the crack-free residue-free transfer free-standing arbitrary substrates. clearly induced quasi-epitaxial crystalline lying-down molecular orientation while maintaining "wetting transparency", which...
Here, we report a substrate-induced intercalation phenomenon of an organic solvent at the interface between monolayer graphene and target substrate. A simple dipping transferred chemical vapor deposition (CVD)-grown on SiO2 substrate into chloroform (CHCl3, CF), common solvent, induces spontaneous formation CF clusters beneath basal plane as well inside wrinkles. The microscopic spectroscopic observations showed doping behavior graphene, which indicates adsorption to graphene. Interestingly,...
We use a combination of Raman spectroscopy and transport measurements to study thin flakes the type-II Weyl semimetal candidate $\mathrm{MoT}{\mathrm{e}}_{2}$ protected from oxidation. In contrast bulk crystals, which undergo phase transition monoclinic inversion symmetry breaking, orthorhombic below $\ensuremath{\sim}250\phantom{\rule{0.16em}{0ex}}\mathrm{K}$, we find that in moderately samples $\ensuremath{\sim}12\phantom{\rule{0.16em}{0ex}}\mathrm{nm}$, single exists up beyond room...
Polycyclic aromatic hydrocarbons (PAH) have been widely used as solid carbon sources for the synthesis of graphene at low temperatures. The inevitable formation structural defects, however, has significantly limited quality synthesized graphene. This article describes a low‐temperature chemical vapor deposition method that effectively mitigates defect in by heterogeneous containing mixture and aliphatic on Cu substrate. addition small amount to PAH decreases density 400 ≤ T 600 °C...
Data-driven public security networking and computer systems are always under threat from malicious codes known as malware; therefore, a large amount of research development is taking place to find effective countermeasures. These countermeasures mainly based on dynamic statistical analysis. Because the obfuscation techniques used by malware authors, researchers anti-virus industry facing colossal issue regarding extraction hidden payloads within packed executable extraction. Based this...
Due to the increasing complexity in miniaturization of electronic devices, reconfigurable field-effect transistors (RFETs) have emerged as a solution. Although foundational concepts RFETs matured over two decades, ongoing breakthroughs are needed address challenges such improving device performance well achieving balanced symmetry between n-type and p-type transport modes with long-term stability. Herein, we present nonvolatile WSe2-based RFET that utilizes photoassisted interfacial charge...
A synthetic approach for high-quality graphene on rough Cu surfaces via chemical vapor deposition is proposed. High-quality synthesized by inducing surface faceting of prior to growth. The electron mobility the enhanced 10 335 cm2 V−1 s−1. As a service our authors and readers, this journal provides supporting information supplied authors. Such materials are peer reviewed may be re-organized online delivery, but not copy-edited or typeset. Technical support issues arising from (other than...
Memristive devices whose resistance can be hysteretically switched by electric field or current are intensely pursued both for fundamental interest as well potential applications in neuromorphic computing and phase-change memory. When the underlying material exhibits additional charge spin order, resistive states directly coupled, further allowing electrical control of collective phases. The observation abrupt, memristive switching tunneling nanoscale junctions ultrathin CrI3 , a natural...
Abstract Mixed layers of octadecyltrichlorosilane (ODTS) and 1H,1H,2H,2H‐perfluorooctyltriethoxysilane (FOTS) on an active layer graphene are used to induce a disordered doping state form robust defense system against machine‐learning attacks (ML attacks). The resulting security key is formed from 12 × array currents produced at low voltage 100 mV. uniformity inter‐Hamming distance (HD) the 50.0 ± 12.3% 45.5 16.7%, respectively, indicating higher performance than other graphene‐based keys....
Vanadium oxides, such as V 2 O 3 , VO and 5 have attracted considerable attention because of the fascinating physical properties each oxidation state. On other hand, precisely controlling individual states is difficult due to sensitivity oxygen stoichiometry. This article reports that reactive annealing (ROA) can systematically change state vanadium oxide films grown on a c‐Al substrate compared with typical under environments. Chemical, structural, electronic, electrical analysis confirms...