- Semiconductor materials and devices
- Copper Interconnects and Reliability
- ZnO doping and properties
- Metal and Thin Film Mechanics
- Advanced Sensor and Energy Harvesting Materials
- Electronic and Structural Properties of Oxides
- Advancements in Semiconductor Devices and Circuit Design
- Thin-Film Transistor Technologies
- Plasma Diagnostics and Applications
- Magnetic properties of thin films
- Gas Sensing Nanomaterials and Sensors
- Advanced Materials and Mechanics
- Nanomaterials and Printing Technologies
- Nanowire Synthesis and Applications
- Optical Coatings and Gratings
- Ga2O3 and related materials
- 2D Materials and Applications
- Copper-based nanomaterials and applications
- Quantum and electron transport phenomena
- Photonic and Optical Devices
- MXene and MAX Phase Materials
- Surface Modification and Superhydrophobicity
- Nanofabrication and Lithography Techniques
- Modular Robots and Swarm Intelligence
- Integrated Circuits and Semiconductor Failure Analysis
Jeju National University
2023-2025
Sejong University
2020-2023
University of Cambridge
2019-2020
Ulsan National Institute of Science and Technology
2013-2019
Chung-Ang University
2008-2011
The development of electronic skin (e‐skin) is great importance in human‐like robotics, healthcare, wearable electronics, and medical applications. In this paper, a bioinspired e‐skin design hierarchical micro‐ nano‐structured ZnO nanowire (NW) arrays an interlocked geometry suggested for the sensitive detection both static dynamic tactile stimuli through piezoresistive piezoelectric transduction modes, respectively. structures enable stress‐sensitive variation contact area between NWs also...
By mimicking muscle actuation to control cavity-pressure-induced adhesion of octopus suckers, smart adhesive pads are developed in which the thermoresponsive a hydrogel layer on elastomeric microcavity enables excellent switchable response thermal stimulus (maximum strength: 94 kPa, switching ratio: ≈293 for temperature change between 22 and 61 °C).
Nanomembranes and nanowires build tiny, transparent loudspeakers sensitive, voice-recognition microphones that attach to skin.
van der Waals heterostructures based on stacked two-dimensional (2D) materials provide novel device structures enabling high-performance electronic and optoelectronic devices. While 2D-2D or 2D-bulk have been largely explored for fundamental understanding applications, 2D-one-dimensional (1D) rarely studied because of the difficulty in achieving high-quality heterojunctions between 2D 1D structures. In this study, we introduce nanosheet-on-1D heterostructure photodetectors a wet-transfer...
Printing has drawn a lot of attention as means low per-unit cost and high throughput patterning graphene inks for scaled-up thin-form factor device manufacturing. However, traditional printing processes require flat surface are incapable achieving on to 3D objects. Here, we present conformal method achieve functional graphene-based patterns arbitrarily-shaped surfaces. Using experimental design, formulate water-insoluble ink with optimum conductivity. We then print single multi-layered...
Silver nanowire (AgNW) electrodes attract significant attention in flexible and transparent optoelectronic devices; however, high-resolution patterning of AgNW remains a considerable challenge. In this study, we have introduced simple technique for solution networks, based on filtration patterned polyimide shadow mask. This process allows the smallest pattern size electrodes, down to width 3.5 μm. addition, demonstrated potential these applications devices, such as photodetectors....
Abstract Solution‐processable thin‐film dielectrics represent an important material family for large‐area, fully‐printed electronics. Yet, in recent years, it has seen only limited development, and mostly remained confined to pure polymers. Although is possible achieve excellent printability, these polymers have low (≈2–5) dielectric constants (ε r ). There been attempts use solution‐processed 2D hexagonal boron nitride ( h ‐BN) as alternative. However, the deposited ‐BN flakes create porous...
Abstract Here, we report a novel MXene–gelatin hydrogel composite (MGHC) strain gauge with healable and biodegradable properties, aimed at bio-comfortable environmentally sustainable applications. The performance of the MGHC was demonstrated through resistance modulation different levels, cyclic endurance, stretching speed sensitivity, hysteresis properties. factor close to unity, approximately 1.0, indicating linear relationship between change ensuring reliable measurements. sensor...
Functional oxides and hybrid structures with interfacial spin–orbit coupling the Rashba–Edelstein effect (REE) are promising materials systems for thermal tolerance spintronic device applications. Here, we demonstrate efficient spin-to-charge conversion through enhanced at all-oxide interface of La1–xCaxMnO3 quasi-two-dimensional (quasi-2D) SrTiO3 (LCMO/STO). The quasi-2D is generated via oxygen vacancies STO surface. We obtain a efficiency θ∥ ≈ 2.32 ± 1.3 nm, most likely originating from...
Development of broadband photodetectors is great importance for applications in high-capacity optical communication, night vision, and biomedical imaging systems. While heterostructured can expand light detection range, fabrication heterostructures via epitaxial growth or wafer bonding still faces significant challenges because problems such as lattice thermal mismatches. Here, a transfer printing technique used the heterogeneous integration InGaAs nanomembranes on silicon semiconductors...
Abstract Early diagnosis in exhaled breath is a key technology for next-generation personal healthcare monitoring. Current chemiresistive sensors, primarily based on metal oxide (MOx) thin films, have limited applicability such portable systems due to their high power consumption, long recovery time, poor device-to-device consistency, and baseline drifts. To address these challenges ammonia ( $${{\rm{NH}}}_{3}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msub> <mml:mrow>...
Abstract Electronic devices with simultaneous manifestation of multiphysical properties are great interest due to their possible application in multifunctional devices. In the present study, execution negative differential resistance (NDR) effect, current rectification (≈10 5 ), and resistive switching characteristics 3 ) demonstrated BaTiO /CeO 2 heterostructure. Although effect has gained huge attention, its instability poor reproducibility at room temperature main obstacles electronic...
Tunable surface morphology in III-V semiconductor nanomembranes provides opportunities to modulate electronic structures and light interactions of semiconductors. Here, we introduce a vacuum-induced wrinkling method for the formation ordered wrinkles InGaAs (thickness, 42 nm) on PDMS microwell arrays as strategy deterministic multidirectional wrinkle engineering nanomembranes. In this approach, pressure difference between outer inner sides patterns covered with leads bulging at predefined...
Plasma etching processes for multi-atomic oxide thin films have become increasingly important owing to the excellent material properties of such films, which can potentially be employed in next-generation displays. To fabricate high-performance and reproducible devices, mechanism surface must understood. In this study, we investigated characteristics changes InGaZnO4 (IGZO) with addition O2 gases based on a CF4/Ar high-density-plasma system. A maximum etch rate 32.7 nm/min an IGZO film was...
Work function tuning has a significant influence on the performance of semiconductor devices, owing to formation potential barriers at interface between metal-semiconductor junctions. In this work, we introduce technique for work ZnSnO thin films using high-density O2 plasma treatment. The and chemical composition film surfaces were investigated with regards treatment time through UPS/XPS systems. optical band gap was estimated Tauc’s relationship from transmittance data. Zn0.6Sn0.4O...
Abstract Al-doped ZnO (AZO) is a promising transparent conducting oxide that can replace indium tin (ITO) owing to its excellent flexibility and eco-friendly characteristics. However, it difficult immediately ITO with AZO because of the difference in their physical properties. Here, we study changes properties thin films using Ar O 2 plasma treatments. treatment causes surface film. The roughness film decreases, work function bandgap slightly increase, sheet resistance significantly...
We demonstrate gate-controlled spin-orbit interaction (SOI) in InAs high-electron mobility transistor (HEMT) structures transferred epitaxially onto Si substrates. Successful epitaxial transfer of the multilayered structure after separation from an original substrate ensures that HEMT maintains a robust bonding interface and crystalline quality with high electron 46200 cm(2)/(V s) at 77 K. Furthermore, Shubnikov-de Haas (SdH) oscillation analysis reveals Rashba SOI parameter (α) can be...
Semiconductor heterostructures have enabled numerous applications in diodes, photodetectors, junction field-effect transistors, and memory devices. Two-dimensional (2D) materials III–V compound semiconductors are two representative providing excellent heterojunction platforms for the fabrication of heterostructure The marriage between these with completely different crystal structures may enable a new unprecedented physical properties. In this study, we demonstrate multifunctional device...