A5100765349- Conducting polymers and applications
- Organic Electronics and Photovoltaics
- Advanced Memory and Neural Computing
- Synthesis of heterocyclic compounds
- Thin-Film Transistor Technologies
- Graphene research and applications
- ZnO doping and properties
- Perovskite Materials and Applications
- Chemical Synthesis and Analysis
- Synthetic Organic Chemistry Methods
- Asymmetric Synthesis and Catalysis
- Molecular Junctions and Nanostructures
- Advanced Sensor and Energy Harvesting Materials
- 2D Materials and Applications
- Quantum Dots Synthesis And Properties
- Organic Light-Emitting Diodes Research
- Chalcogenide Semiconductor Thin Films
- Nanowire Synthesis and Applications
- Multicomponent Synthesis of Heterocycles
- Neuroscience and Neural Engineering
- Organic and Inorganic Chemical Reactions
- Ferroelectric and Negative Capacitance Devices
- Synthesis and Catalytic Reactions
- Nanomaterials and Printing Technologies
- Synthesis and Reactivity of Heterocycles
The University of Texas Medical Branch at Galveston
2024
Kookmin University
2013-2023
Konkuk University
2011-2021
Pusan National University
2015-2019
Seoul Institute
2018
Government of the Republic of Korea
2018
University of Cambridge
2009-2013
Konkuk University Medical Center
2012
Inha University
2010
Kunsan National University
2009
Ambipolar OFETs with balanced hole and electron field-effect mobilities both exceeding 1 cm(2) V(-1) s(-1) are achieved based on a single-solution-processed conjugated polymer, DPPT-TT, upon careful optimization of the device architecture, charge injection, polymer processing. Such high-performance promising for applications in ambipolar devices integrated circuits, as well model systems fundamental studies.
Graphene produced by exfoliation has not been able to provide an ideal graphene with performance comparable that predicted theory, and structural and/or electronic defects have proposed as one cause of reduced performance. We report the observation domains on exfoliated monolayer differ their friction characteristics, measured force microscopy. Angle-dependent scanning revealed anisotropy a periodicity 180° each domain. The decreased applied load increased. propose arise from ripple...
Abstract Charge transport in the ribbon phase of poly(2,5‐bis(3‐alkylthiophen‐2‐yl)thieno[3,2‐ b ]thiophene) (PBTTT)—one most highly ordered, chain‐extended crystalline microstructures available a conjugated polymer semiconductor—is studied. Ribbon‐phase PBTTT has previously been found not to exhibit high carrier mobilities, but it is shown here that field‐effect mobilities depend strongly on device architecture and active interface. When devices are constructed such ribbon‐phase films...
Sensors based on 2D rGO/2D MoS<sub>2</sub> van der Waals hybrid composites exhibited high sensitivity, extreme selectivity, fast response/recovery, and good reliability to humidity detection.
Monolayer graphene is one of the most interesting materials applicable to next-generation electronic devices due its transport properties. However, realization requires suitable nanoscale lithography as well a method open band gap in monolayer graphene. Nanoscale hydrogenation and oxidation are promising methods an energy by modification surface structures fabricate nanostructures such nanoribbons (GNRs). Until now it has been difficult consisting both hydrogenated oxidized because...
The structure of water confined in nanometer-sized cavities is important because, at this scale, a large fraction hydrogen bonds can be perturbed by interaction with the confining walls. Unusual fluidity properties thus expected narrow pores, leading to new phenomena like enhanced reported carbon nanotubes. Crystalline mica and amorphous silicon dioxide are hydrophilic substrates that strongly adsorb water. Graphene, on other hand, interacts weakly This presents question as what determines...
A new type of wearable electronic device, called a textile memory, is reported. This created by combining the unique properties Al‐coated threads with native layer Al 2 O 3 as resistance switching layer, and carbon fiber counter‐electrode, which induces fluent redox reaction at interface under small electrical bias (typically 2–3 V). These two materials can be embroidered into an existing cloth or woven novel cloth. The contacts repeatedly switched polarity, observed in recently highlighted...
Two-dimensional (2D) van der Waals (vdW) materials have recently attracted considerable attention due to their excellent electrical and mechanical properties. TmPSx (where Tm = a transition metal), which is new class of 2D vdW materials, expected show various physical phenomena depending on the used. In this paper, unprecedented synaptic behavior vertical Ag/CrPS4/Au capacitor structure, where CrPS4 single-crystalline layer, reported. Multi-stable resistive states were obtained using an...
Abstract A key component of organic bioelectronics is electrolyte‐gated field‐effect transistors (EG‐OFETs), which have recently been used as sensors to demonstrate label‐free, single‐molecule detection. However, these devices exhibit limited stability when operated in direct contact with aqueous electrolytes. Ultrahigh demonstrated be achievable through the utilization a systematic multifactorial approach this study. EG‐OFETs operational and lifetime several orders magnitude higher than...
Introduction: To identify fall risk groups among community-dwelling older adults in South Korea and build a classification model by investigating risk-associated factors. Methods: This cross-sectional study analyzed data of 9,231 from the 2020 Elderly Survey. We used latent class analysis to based on indicators. Thereafter, models were developed with these identified as outcome variables. Results: Latent results indicated that three-class was more interpretable fit better than other models....
A nonvolatile organic transistor memory device was developed using layer-by-layer assembly of 3-aminopropyltriethoxysilane (APTES) and solution-processed, reduced graphene oxide (rGO) as the charge trapping layer on flexible substrates. Reduction successful adsorption rGO APTES-covered substrates were confirmed. The devices based exhibited reliable programmable operations, confirmed by program/erase data retention, endurance properties. These methods can potentially play a significant role...
A practically applicable type of wearable polymer solar cells (PSCs) is presented with the enhanced performance by exploiting simply embodied, plasmonic nanostructures on a commercially available textile platform optically opaque, geometrically uneven, and physically permeable woven fabrics that are commonly not compatible organic photovoltaics. On conformable fabric substrate preferentially processed organic/inorganic multilayers for both planarization encapsulation, fabrication...
Abstract The ideality factor ( n id ) and photoluminescence (PL) analyses assess charge recombination characteristics in perovskite solar cells (PeSCs). However, their correlations with open‐circuit voltage V oc are often found to be complicated depending on the types devices. Herein, correlation of , PL is elucidated interfacial crystal quality triple‐cation mixed‐halide perovskite, Cs 0.05 (MA 0.17 FA 0.83 0.95 Pb(I Br 3 deposited different hole transport layers (HTLs). In devices low...
Organic semiconductors have great potential for future electronic applications owing to their inherent flexibility, low cost, light weight and ability easily cover large areas. However, all of these advantageous material properties can only be harnessed if simple, cheap low-temperature fabrication processes, which exclude the need vacuum deposition are compatible with flexible plastic substrates, employed. There a few solution-based techniques such as spin-coating inkjet printing that meet...
Binarized Neural Networks (BNNs) use only binary synapses of +1 and -1, not allowing any intermediate weights between -1 +1. Though the recognition rate BNNs is lower than conventional Deep (DNNs), have attracted many interests nowadays, because do need complicated multiplication such as DNNs. Binary memristor crossbars can be very suitable to realize BNN hardware. This because, in BNNs, simple operation performed bitwise manner for all columns crossbars, simultaneously. In this paper,...
Deformation normal to the surface is intrinsic in two-dimensional materials due phononic thermal fluctuations at finite temperatures. Graphene's negative expansion coefficient generally explained by such an property. Recently, friction measurements on graphene exfoliated a silicon oxide revealed anomalous anisotropy whose origin was believed be formation of ripple domains. Here, we uncover atomistic observed domains using cantilever torsion microscopy conjunction with angle-resolved...
We demonstrate the effect of surface chemical dynamics on carrier transport and recombination processes electron-hole pairs in ZnO nanowire field transistors. have found that electrical conductance decreases threshold voltages shift a positive gate voltage direction, as characteristics are measured repeatedly. associate this with enhancement oxygen adsorption by capturing electrons from induced current during probing. This results an overall depletion thus causes associated origin width...
Charge carriers induced in field-effect transistors based on a uniaxially aligned polythiophene polymer, poly(2,5-bis(3-alkylthiophen-2-yl)thieno[3,2-b]thiophene) (PBTTT), are investigated by electrooptical charge modulation spectroscopy (CMS). We used zone-casting deposition method for uniaxial alignment of the nanoribbon crystalline domains polymer and examined optical anisotropy neutral absorptions FETs. find that charge-induced polaronic at interface exhibit similar degree as absorption...